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1 | // Created on: 2013-05-29 |
2 | // Created by: Anton POLETAEV |
3 | // Copyright (c) 1999-2014 OPEN CASCADE SAS |
4 | // |
5 | // This file is part of Open CASCADE Technology software library. |
6 | // |
d5f74e42 |
7 | // This library is free software; you can redistribute it and/or modify it under |
8 | // the terms of the GNU Lesser General Public License version 2.1 as published |
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9 | // by the Free Software Foundation, with special exception defined in the file |
10 | // OCCT_LGPL_EXCEPTION.txt. Consult the file LICENSE_LGPL_21.txt included in OCCT |
11 | // distribution for complete text of the license and disclaimer of any warranty. |
12 | // |
13 | // Alternatively, this file may be used under the terms of Open CASCADE |
14 | // commercial license or contractual agreement. |
15 | |
16 | #include <gp_Pln.hxx> |
17 | #include <Standard_ShortReal.hxx> |
18 | |
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19 | #include <Graphic3d_Camera.hxx> |
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20 | #include <Graphic3d_Vec4.hxx> |
21 | #include <Graphic3d_WorldViewProjState.hxx> |
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22 | |
23 | #include <Standard_Atomic.hxx> |
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24 | #include <Standard_Assert.hxx> |
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25 | |
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26 | #include <NCollection_Sequence.hxx> |
27 | |
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28 | |
29 | namespace |
30 | { |
31 | // (degrees -> radians) * 0.5 |
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32 | static const Standard_Real DTR_HALF = 0.5 * 0.0174532925; |
33 | |
34 | // default property values |
35 | static const Standard_Real DEFAULT_ZNEAR = 0.001; |
36 | static const Standard_Real DEFAULT_ZFAR = 3000.0; |
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37 | |
38 | // atomic state counter |
39 | static volatile Standard_Integer THE_STATE_COUNTER = 0; |
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40 | |
41 | // minimum camera distance |
42 | static const Standard_Real MIN_DISTANCE = Pow (0.1, ShortRealDigits() - 2); |
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43 | |
44 | // z-range tolerance compatible with for floating point. |
45 | static Standard_Real zEpsilon() |
46 | { |
47 | return FLT_EPSILON; |
48 | } |
49 | |
50 | // relative z-range tolerance compatible with for floating point. |
51 | static Standard_Real zEpsilon (const Standard_Real theValue) |
52 | { |
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53 | Standard_Real anAbsValue = Abs (theValue); |
54 | if (anAbsValue <= (double)FLT_MIN) |
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55 | { |
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56 | return FLT_MIN; |
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57 | } |
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58 | Standard_Real aLogRadix = Log10 (anAbsValue) / Log10 (FLT_RADIX); |
ea764884 |
59 | Standard_Real aExp = Floor (aLogRadix); |
60 | return FLT_EPSILON * Pow (FLT_RADIX, aExp); |
61 | }; |
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62 | }; |
63 | |
64 | // ======================================================================= |
65 | // function : Graphic3d_Camera |
66 | // purpose : |
67 | // ======================================================================= |
68 | Graphic3d_Camera::Graphic3d_Camera() |
69 | : myUp (0.0, 1.0, 0.0), |
70 | myEye (0.0, 0.0, -1500.0), |
71 | myCenter (0.0, 0.0, 0.0), |
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72 | myAxialScale (1.0, 1.0, 1.0), |
73 | myProjType (Projection_Orthographic), |
74 | myFOVy (45.0), |
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75 | myZNear (DEFAULT_ZNEAR), |
76 | myZFar (DEFAULT_ZFAR), |
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77 | myAspect (1.0), |
78 | myScale (1000.0), |
79 | myZFocus (1.0), |
80 | myZFocusType (FocusType_Relative), |
81 | myIOD (0.05), |
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82 | myIODType (IODType_Relative) |
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83 | { |
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84 | myWorldViewProjState.Initialize ((Standard_Size)Standard_Atomic_Increment (&THE_STATE_COUNTER), |
85 | (Standard_Size)Standard_Atomic_Increment (&THE_STATE_COUNTER), |
86 | this); |
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87 | } |
88 | |
89 | // ======================================================================= |
90 | // function : Graphic3d_Camera |
91 | // purpose : |
92 | // ======================================================================= |
93 | Graphic3d_Camera::Graphic3d_Camera (const Handle(Graphic3d_Camera)& theOther) |
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94 | { |
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95 | myWorldViewProjState.Initialize (this); |
96 | |
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97 | Copy (theOther); |
98 | } |
99 | |
100 | // ======================================================================= |
101 | // function : CopyMappingData |
102 | // purpose : |
103 | // ======================================================================= |
104 | void Graphic3d_Camera::CopyMappingData (const Handle(Graphic3d_Camera)& theOtherCamera) |
105 | { |
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106 | myFOVy = theOtherCamera->myFOVy; |
107 | myZNear = theOtherCamera->myZNear; |
108 | myZFar = theOtherCamera->myZFar; |
109 | myAspect = theOtherCamera->myAspect; |
110 | myScale = theOtherCamera->myScale; |
111 | myZFocus = theOtherCamera->myZFocus; |
112 | myZFocusType = theOtherCamera->myZFocusType; |
113 | myIOD = theOtherCamera->myIOD; |
114 | myIODType = theOtherCamera->myIODType; |
115 | myProjType = theOtherCamera->myProjType; |
116 | |
117 | myWorldViewProjState.ProjectionState() = theOtherCamera->ProjectionState(); |
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118 | |
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119 | InvalidateProjection(); |
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120 | } |
121 | |
122 | // ======================================================================= |
123 | // function : CopyOrientationData |
124 | // purpose : |
125 | // ======================================================================= |
126 | void Graphic3d_Camera::CopyOrientationData (const Handle(Graphic3d_Camera)& theOtherCamera) |
127 | { |
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128 | myUp = theOtherCamera->myUp; |
129 | myEye = theOtherCamera->myEye; |
130 | myCenter = theOtherCamera->myCenter; |
131 | myAxialScale = theOtherCamera->myAxialScale; |
132 | |
133 | myWorldViewProjState.WorldViewState() = theOtherCamera->WorldViewState(); |
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134 | |
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135 | InvalidateOrientation(); |
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136 | } |
137 | |
138 | // ======================================================================= |
139 | // function : Copy |
140 | // purpose : |
141 | // ======================================================================= |
142 | void Graphic3d_Camera::Copy (const Handle(Graphic3d_Camera)& theOther) |
143 | { |
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144 | CopyMappingData (theOther); |
145 | CopyOrientationData (theOther); |
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146 | } |
147 | |
148 | // ======================================================================= |
149 | // function : SetEye |
150 | // purpose : |
151 | // ======================================================================= |
152 | void Graphic3d_Camera::SetEye (const gp_Pnt& theEye) |
153 | { |
154 | myEye = theEye; |
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155 | InvalidateOrientation(); |
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156 | } |
157 | |
158 | // ======================================================================= |
159 | // function : SetCenter |
160 | // purpose : |
161 | // ======================================================================= |
162 | void Graphic3d_Camera::SetCenter (const gp_Pnt& theCenter) |
163 | { |
164 | myCenter = theCenter; |
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165 | InvalidateOrientation(); |
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166 | } |
167 | |
168 | // ======================================================================= |
169 | // function : SetUp |
170 | // purpose : |
171 | // ======================================================================= |
172 | void Graphic3d_Camera::SetUp (const gp_Dir& theUp) |
173 | { |
174 | myUp = theUp; |
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175 | InvalidateOrientation(); |
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176 | } |
177 | |
178 | // ======================================================================= |
179 | // function : SetAxialScale |
180 | // purpose : |
181 | // ======================================================================= |
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182 | void Graphic3d_Camera::SetAxialScale (const gp_XYZ& theAxialScale) |
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183 | { |
184 | myAxialScale = theAxialScale; |
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185 | InvalidateOrientation(); |
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186 | } |
187 | |
188 | // ======================================================================= |
189 | // function : SetDistance |
190 | // purpose : |
191 | // ======================================================================= |
192 | void Graphic3d_Camera::SetDistance (const Standard_Real theDistance) |
193 | { |
194 | gp_Vec aCenter2Eye (Direction()); |
195 | aCenter2Eye.Reverse(); |
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196 | |
197 | // Camera should have non-zero distance. |
198 | aCenter2Eye.Scale (Max (theDistance, MIN_DISTANCE)); |
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199 | SetEye (Center().Translated (aCenter2Eye)); |
200 | } |
201 | |
202 | // ======================================================================= |
203 | // function : Distance |
204 | // purpose : |
205 | // ======================================================================= |
206 | Standard_Real Graphic3d_Camera::Distance() const |
207 | { |
208 | return myEye.Distance (myCenter); |
209 | } |
210 | |
211 | // ======================================================================= |
212 | // function : SetDirection |
213 | // purpose : |
214 | // ======================================================================= |
215 | void Graphic3d_Camera::SetDirection (const gp_Dir& theDir) |
216 | { |
217 | gp_Vec aScaledDir (theDir); |
218 | aScaledDir.Scale (Distance()); |
219 | aScaledDir.Reverse(); |
220 | SetEye (Center().Translated (aScaledDir)); |
221 | } |
222 | |
223 | // ======================================================================= |
224 | // function : Direction |
225 | // purpose : |
226 | // ======================================================================= |
227 | gp_Dir Graphic3d_Camera::Direction() const |
228 | { |
229 | return gp_Dir (gp_Vec (myEye, myCenter)); |
230 | } |
231 | |
232 | // ======================================================================= |
233 | // function : SetScale |
234 | // purpose : |
235 | // ======================================================================= |
236 | void Graphic3d_Camera::SetScale (const Standard_Real theScale) |
237 | { |
238 | myScale = theScale; |
239 | |
240 | switch (myProjType) |
241 | { |
242 | case Projection_Perspective : |
243 | case Projection_Stereo : |
244 | case Projection_MonoLeftEye : |
245 | case Projection_MonoRightEye : |
246 | { |
247 | Standard_Real aDistance = theScale * 0.5 / Tan(myFOVy * M_PI / 360.0); |
248 | SetDistance (aDistance); |
249 | } |
250 | |
251 | default : |
252 | break; |
253 | } |
254 | |
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255 | InvalidateProjection(); |
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256 | } |
257 | |
258 | // ======================================================================= |
259 | // function : Scale |
260 | // purpose : |
261 | // ======================================================================= |
262 | Standard_Real Graphic3d_Camera::Scale() const |
263 | { |
264 | switch (myProjType) |
265 | { |
266 | case Projection_Orthographic : |
267 | return myScale; |
268 | |
269 | // case Projection_Perspective : |
270 | // case Projection_Stereo : |
271 | // case Projection_MonoLeftEye : |
272 | // case Projection_MonoRightEye : |
273 | default : |
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274 | return Distance() * 2.0 * Tan (myFOVy * M_PI / 360.0); |
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275 | } |
276 | } |
277 | |
278 | // ======================================================================= |
279 | // function : SetProjectionType |
280 | // purpose : |
281 | // ======================================================================= |
282 | void Graphic3d_Camera::SetProjectionType (const Projection theProjectionType) |
283 | { |
284 | Projection anOldType = myProjType; |
285 | |
286 | if (anOldType == theProjectionType) |
287 | { |
288 | return; |
289 | } |
290 | |
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291 | if (anOldType == Projection_Orthographic) |
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292 | { |
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293 | if (myZNear <= RealEpsilon()) |
294 | { |
295 | myZNear = DEFAULT_ZNEAR; |
296 | } |
297 | if (myZFar <= RealEpsilon()) |
298 | { |
299 | myZFar = DEFAULT_ZFAR; |
300 | } |
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301 | } |
302 | |
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303 | myProjType = theProjectionType; |
304 | |
305 | InvalidateProjection(); |
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306 | } |
307 | |
308 | // ======================================================================= |
309 | // function : SetFOVy |
310 | // purpose : |
311 | // ======================================================================= |
312 | void Graphic3d_Camera::SetFOVy (const Standard_Real theFOVy) |
313 | { |
314 | myFOVy = theFOVy; |
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315 | InvalidateProjection(); |
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316 | } |
317 | |
318 | // ======================================================================= |
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319 | // function : SetZRange |
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320 | // purpose : |
321 | // ======================================================================= |
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322 | void Graphic3d_Camera::SetZRange (const Standard_Real theZNear, |
323 | const Standard_Real theZFar) |
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324 | { |
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325 | Standard_ASSERT_RAISE (theZFar > theZNear, "ZFar should be greater than ZNear"); |
326 | if (!IsOrthographic()) |
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327 | { |
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328 | Standard_ASSERT_RAISE (theZNear > 0.0, "Only positive Z-Near is allowed for perspective camera"); |
329 | Standard_ASSERT_RAISE (theZFar > 0.0, "Only positive Z-Far is allowed for perspective camera"); |
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330 | } |
331 | |
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332 | myZNear = theZNear; |
333 | myZFar = theZFar; |
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334 | |
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335 | InvalidateProjection(); |
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336 | } |
337 | |
338 | // ======================================================================= |
339 | // function : SetAspect |
340 | // purpose : |
341 | // ======================================================================= |
342 | void Graphic3d_Camera::SetAspect (const Standard_Real theAspect) |
343 | { |
344 | myAspect = theAspect; |
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345 | InvalidateProjection(); |
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346 | } |
347 | |
348 | // ======================================================================= |
349 | // function : SetZFocus |
350 | // purpose : |
351 | // ======================================================================= |
352 | void Graphic3d_Camera::SetZFocus(const FocusType theType, const Standard_Real theZFocus) |
353 | { |
354 | myZFocusType = theType; |
355 | myZFocus = theZFocus; |
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356 | InvalidateProjection(); |
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357 | } |
358 | |
359 | // ======================================================================= |
360 | // function : SetIOD |
361 | // purpose : |
362 | // ======================================================================= |
363 | void Graphic3d_Camera::SetIOD (const IODType theType, const Standard_Real theIOD) |
364 | { |
365 | myIODType = theType; |
366 | myIOD = theIOD; |
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367 | InvalidateProjection(); |
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368 | } |
369 | |
370 | // ======================================================================= |
371 | // function : OrthogonalizeUp |
372 | // purpose : |
373 | // ======================================================================= |
374 | void Graphic3d_Camera::OrthogonalizeUp() |
375 | { |
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376 | SetUp (OrthogonalizedUp()); |
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377 | } |
378 | |
379 | // ======================================================================= |
197ac94e |
380 | // function : OrthogonalizedUp |
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381 | // purpose : |
382 | // ======================================================================= |
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383 | gp_Dir Graphic3d_Camera::OrthogonalizedUp() const |
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384 | { |
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385 | gp_Dir aDir = Direction(); |
386 | gp_Dir aLeft = aDir.Crossed (Up()); |
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387 | |
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388 | // recompute up as: up = left x direction |
389 | return aLeft.Crossed (aDir); |
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390 | } |
391 | |
392 | // ======================================================================= |
393 | // function : Transform |
394 | // purpose : |
395 | // ======================================================================= |
396 | void Graphic3d_Camera::Transform (const gp_Trsf& theTrsf) |
397 | { |
398 | myUp.Transform (theTrsf); |
399 | myEye.Transform (theTrsf); |
400 | myCenter.Transform (theTrsf); |
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401 | InvalidateOrientation(); |
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402 | } |
403 | |
404 | // ======================================================================= |
405 | // function : safePointCast |
406 | // purpose : |
407 | // ======================================================================= |
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408 | static Graphic3d_Vec4d safePointCast (const gp_Pnt& thePnt) |
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409 | { |
410 | Standard_Real aLim = 1e15f; |
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411 | |
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412 | // have to deal with values greater then max float |
413 | gp_Pnt aSafePoint = thePnt; |
414 | const Standard_Real aBigFloat = aLim * 0.1f; |
415 | if (Abs (aSafePoint.X()) > aLim) |
416 | aSafePoint.SetX (aSafePoint.X() >= 0 ? aBigFloat : -aBigFloat); |
417 | if (Abs (aSafePoint.Y()) > aLim) |
418 | aSafePoint.SetY (aSafePoint.Y() >= 0 ? aBigFloat : -aBigFloat); |
419 | if (Abs (aSafePoint.Z()) > aLim) |
420 | aSafePoint.SetZ (aSafePoint.Z() >= 0 ? aBigFloat : -aBigFloat); |
421 | |
422 | // convert point |
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423 | Graphic3d_Vec4d aPnt (aSafePoint.X(), aSafePoint.Y(), aSafePoint.Z(), 1.0); |
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424 | |
425 | return aPnt; |
426 | } |
427 | |
428 | // ======================================================================= |
429 | // function : Project |
430 | // purpose : |
431 | // ======================================================================= |
432 | gp_Pnt Graphic3d_Camera::Project (const gp_Pnt& thePnt) const |
433 | { |
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434 | const Graphic3d_Mat4d& aViewMx = OrientationMatrix(); |
435 | const Graphic3d_Mat4d& aProjMx = ProjectionMatrix(); |
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436 | |
437 | // use compatible type of point |
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438 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
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439 | |
440 | aPnt = aViewMx * aPnt; // convert to view coordinate space |
441 | aPnt = aProjMx * aPnt; // convert to projection coordinate space |
442 | |
443 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
444 | |
445 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
446 | } |
447 | |
448 | // ======================================================================= |
449 | // function : UnProject |
450 | // purpose : |
451 | // ======================================================================= |
452 | gp_Pnt Graphic3d_Camera::UnProject (const gp_Pnt& thePnt) const |
453 | { |
197ac94e |
454 | const Graphic3d_Mat4d& aViewMx = OrientationMatrix(); |
455 | const Graphic3d_Mat4d& aProjMx = ProjectionMatrix(); |
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456 | |
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457 | Graphic3d_Mat4d aInvView; |
458 | Graphic3d_Mat4d aInvProj; |
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459 | |
460 | // this case should never happen |
461 | if (!aViewMx.Inverted (aInvView) || !aProjMx.Inverted (aInvProj)) |
462 | { |
463 | return gp_Pnt (0.0, 0.0, 0.0); |
464 | } |
465 | |
466 | // use compatible type of point |
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467 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
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468 | |
469 | aPnt = aInvProj * aPnt; // convert to view coordinate space |
470 | aPnt = aInvView * aPnt; // convert to world coordinate space |
471 | |
472 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
473 | |
474 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
475 | } |
476 | |
477 | // ======================================================================= |
478 | // function : ConvertView2Proj |
479 | // purpose : |
480 | // ======================================================================= |
481 | gp_Pnt Graphic3d_Camera::ConvertView2Proj (const gp_Pnt& thePnt) const |
482 | { |
197ac94e |
483 | const Graphic3d_Mat4d& aProjMx = ProjectionMatrix(); |
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484 | |
485 | // use compatible type of point |
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486 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
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487 | |
488 | aPnt = aProjMx * aPnt; // convert to projection coordinate space |
489 | |
490 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
491 | |
492 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
493 | } |
494 | |
495 | // ======================================================================= |
496 | // function : ConvertProj2View |
497 | // purpose : |
498 | // ======================================================================= |
499 | gp_Pnt Graphic3d_Camera::ConvertProj2View (const gp_Pnt& thePnt) const |
500 | { |
197ac94e |
501 | const Graphic3d_Mat4d& aProjMx = ProjectionMatrix(); |
b5ac8292 |
502 | |
197ac94e |
503 | Graphic3d_Mat4d aInvProj; |
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504 | |
505 | // this case should never happen, but... |
506 | if (!aProjMx.Inverted (aInvProj)) |
507 | { |
197ac94e |
508 | return gp_Pnt (0, 0, 0); |
b5ac8292 |
509 | } |
510 | |
511 | // use compatible type of point |
197ac94e |
512 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
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513 | |
514 | aPnt = aInvProj * aPnt; // convert to view coordinate space |
515 | |
516 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
517 | |
518 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
519 | } |
520 | |
521 | // ======================================================================= |
522 | // function : ConvertWorld2View |
523 | // purpose : |
524 | // ======================================================================= |
525 | gp_Pnt Graphic3d_Camera::ConvertWorld2View (const gp_Pnt& thePnt) const |
526 | { |
197ac94e |
527 | const Graphic3d_Mat4d& aViewMx = OrientationMatrix(); |
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528 | |
529 | // use compatible type of point |
197ac94e |
530 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
b5ac8292 |
531 | |
532 | aPnt = aViewMx * aPnt; // convert to view coordinate space |
533 | |
534 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
535 | |
536 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
537 | } |
538 | |
539 | // ======================================================================= |
540 | // function : ConvertView2World |
541 | // purpose : |
542 | // ======================================================================= |
543 | gp_Pnt Graphic3d_Camera::ConvertView2World (const gp_Pnt& thePnt) const |
544 | { |
197ac94e |
545 | const Graphic3d_Mat4d& aViewMx = OrientationMatrix(); |
b5ac8292 |
546 | |
197ac94e |
547 | Graphic3d_Mat4d aInvView; |
b5ac8292 |
548 | |
549 | if (!aViewMx.Inverted (aInvView)) |
550 | { |
551 | return gp_Pnt(0, 0, 0); |
552 | } |
553 | |
554 | // use compatible type of point |
197ac94e |
555 | Graphic3d_Vec4d aPnt = safePointCast (thePnt); |
b5ac8292 |
556 | |
557 | aPnt = aInvView * aPnt; // convert to world coordinate space |
558 | |
559 | const Standard_Real aInvW = 1.0 / Standard_Real (aPnt.w()); |
560 | |
561 | return gp_Pnt (aPnt.x() * aInvW, aPnt.y() * aInvW, aPnt.z() * aInvW); |
562 | } |
563 | |
564 | // ======================================================================= |
565 | // function : ViewDimensions |
566 | // purpose : |
567 | // ======================================================================= |
197ac94e |
568 | gp_XYZ Graphic3d_Camera::ViewDimensions() const |
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569 | { |
570 | // view plane dimensions |
539d3a1b |
571 | Standard_Real aSize = IsOrthographic() ? myScale : (2.0 * Distance() * Tan (DTR_HALF * myFOVy)); |
572 | Standard_Real aSizeX, aSizeY; |
573 | if (myAspect > 1.0) |
574 | { |
575 | aSizeX = aSize * myAspect; |
576 | aSizeY = aSize; |
577 | } |
578 | else |
579 | { |
580 | aSizeX = aSize; |
581 | aSizeY = aSize / myAspect; |
582 | } |
b5ac8292 |
583 | |
584 | // and frustum depth |
197ac94e |
585 | return gp_XYZ (aSizeX, aSizeY, myZFar - myZNear); |
b5ac8292 |
586 | } |
587 | |
588 | // ======================================================================= |
197ac94e |
589 | // function : Frustum |
b5ac8292 |
590 | // purpose : |
591 | // ======================================================================= |
197ac94e |
592 | void Graphic3d_Camera::Frustum (gp_Pln& theLeft, |
593 | gp_Pln& theRight, |
594 | gp_Pln& theBottom, |
595 | gp_Pln& theTop, |
596 | gp_Pln& theNear, |
597 | gp_Pln& theFar) const |
b5ac8292 |
598 | { |
197ac94e |
599 | gp_Vec aProjection = gp_Vec (Direction()); |
600 | gp_Vec anUp = OrthogonalizedUp(); |
601 | gp_Vec aSide = aProjection ^ anUp; |
602 | |
603 | Standard_ASSERT_RAISE ( |
604 | !aProjection.IsParallel (anUp, Precision::Angular()), |
605 | "Can not derive SIDE = PROJ x UP - directions are parallel"); |
606 | |
607 | theNear = gp_Pln (Eye().Translated (aProjection * ZNear()), aProjection); |
608 | theFar = gp_Pln (Eye().Translated (aProjection * ZFar()), -aProjection); |
609 | |
610 | Standard_Real aHScaleHor = Scale() * 0.5 * Aspect(); |
611 | Standard_Real aHScaleVer = Scale() * 0.5; |
612 | |
613 | gp_Pnt aPntLeft = Center().Translated (aHScaleHor * -aSide); |
614 | gp_Pnt aPntRight = Center().Translated (aHScaleHor * aSide); |
615 | gp_Pnt aPntBottom = Center().Translated (aHScaleVer * -anUp); |
616 | gp_Pnt aPntTop = Center().Translated (aHScaleVer * anUp); |
617 | |
618 | gp_Vec aDirLeft = aSide; |
619 | gp_Vec aDirRight = -aSide; |
620 | gp_Vec aDirBottom = anUp; |
621 | gp_Vec aDirTop = -anUp; |
622 | if (!IsOrthographic()) |
623 | { |
624 | Standard_Real aHFOVHor = ATan (Tan (DTR_HALF * FOVy()) * Aspect()); |
625 | Standard_Real aHFOVVer = DTR_HALF * FOVy(); |
626 | aDirLeft.Rotate (gp_Ax1 (gp::Origin(), anUp), aHFOVHor); |
627 | aDirRight.Rotate (gp_Ax1 (gp::Origin(), anUp), -aHFOVHor); |
628 | aDirBottom.Rotate (gp_Ax1 (gp::Origin(), aSide), -aHFOVVer); |
629 | aDirTop.Rotate (gp_Ax1 (gp::Origin(), aSide), aHFOVVer); |
630 | } |
631 | |
632 | theLeft = gp_Pln (aPntLeft, aDirLeft); |
633 | theRight = gp_Pln (aPntRight, aDirRight); |
634 | theBottom = gp_Pln (aPntBottom, aDirBottom); |
635 | theTop = gp_Pln (aPntTop, aDirTop); |
636 | } |
637 | |
638 | // ======================================================================= |
639 | // function : OrientationMatrix |
640 | // purpose : |
641 | // ======================================================================= |
642 | const Graphic3d_Mat4d& Graphic3d_Camera::OrientationMatrix() const |
643 | { |
644 | return *UpdateOrientation (myMatricesD).Orientation; |
645 | } |
646 | |
647 | // ======================================================================= |
648 | // function : OrientationMatrixF |
649 | // purpose : |
650 | // ======================================================================= |
651 | const Graphic3d_Mat4& Graphic3d_Camera::OrientationMatrixF() const |
652 | { |
653 | return *UpdateOrientation (myMatricesF).Orientation; |
654 | } |
655 | |
656 | // ======================================================================= |
657 | // function : ProjectionMatrix |
658 | // purpose : |
659 | // ======================================================================= |
660 | const Graphic3d_Mat4d& Graphic3d_Camera::ProjectionMatrix() const |
661 | { |
662 | return *UpdateProjection (myMatricesD).MProjection; |
663 | } |
664 | |
665 | // ======================================================================= |
666 | // function : ProjectionMatrixF |
667 | // purpose : |
668 | // ======================================================================= |
669 | const Graphic3d_Mat4& Graphic3d_Camera::ProjectionMatrixF() const |
670 | { |
671 | return *UpdateProjection (myMatricesF).MProjection; |
672 | } |
673 | |
674 | // ======================================================================= |
675 | // function : ProjectionStereoLeft |
676 | // purpose : |
677 | // ======================================================================= |
678 | const Graphic3d_Mat4d& Graphic3d_Camera::ProjectionStereoLeft() const |
679 | { |
680 | return *UpdateProjection (myMatricesD).LProjection; |
681 | } |
682 | |
683 | // ======================================================================= |
684 | // function : ProjectionStereoLeftF |
685 | // purpose : |
686 | // ======================================================================= |
687 | const Graphic3d_Mat4& Graphic3d_Camera::ProjectionStereoLeftF() const |
688 | { |
689 | return *UpdateProjection (myMatricesF).LProjection; |
690 | } |
691 | |
692 | // ======================================================================= |
693 | // function : ProjectionStereoRight |
694 | // purpose : |
695 | // ======================================================================= |
696 | const Graphic3d_Mat4d& Graphic3d_Camera::ProjectionStereoRight() const |
697 | { |
698 | return *UpdateProjection (myMatricesD).RProjection; |
699 | } |
700 | |
701 | // ======================================================================= |
702 | // function : ProjectionStereoRightF |
703 | // purpose : |
704 | // ======================================================================= |
705 | const Graphic3d_Mat4& Graphic3d_Camera::ProjectionStereoRightF() const |
706 | { |
707 | return *UpdateProjection (myMatricesF).RProjection; |
b5ac8292 |
708 | } |
709 | |
710 | // ======================================================================= |
711 | // function : UpdateProjection |
712 | // purpose : |
713 | // ======================================================================= |
197ac94e |
714 | template <typename Elem_t> |
715 | Graphic3d_Camera::TransformMatrices<Elem_t>& |
716 | Graphic3d_Camera::UpdateProjection (TransformMatrices<Elem_t>& theMatrices) const |
b5ac8292 |
717 | { |
197ac94e |
718 | if (theMatrices.IsProjectionValid()) |
b5ac8292 |
719 | { |
197ac94e |
720 | return theMatrices; // for inline accessors |
b5ac8292 |
721 | } |
722 | |
197ac94e |
723 | theMatrices.InitProjection(); |
b5ac8292 |
724 | |
725 | // sets top of frustum based on FOVy and near clipping plane |
197ac94e |
726 | Elem_t aScale = static_cast<Elem_t> (myScale); |
727 | Elem_t aZNear = static_cast<Elem_t> (myZNear); |
728 | Elem_t aZFar = static_cast<Elem_t> (myZFar); |
729 | Elem_t anAspect = static_cast<Elem_t> (myAspect); |
ab1c121b |
730 | Elem_t aDXHalf = 0.0, aDYHalf = 0.0; |
b5ac8292 |
731 | if (IsOrthographic()) |
732 | { |
ab1c121b |
733 | aDXHalf = aScale * Elem_t (0.5); |
197ac94e |
734 | aDYHalf = aScale * Elem_t (0.5); |
b5ac8292 |
735 | } |
736 | else |
737 | { |
ab1c121b |
738 | aDXHalf = aZNear * Elem_t (Tan (DTR_HALF * myFOVy)); |
197ac94e |
739 | aDYHalf = aZNear * Elem_t (Tan (DTR_HALF * myFOVy)); |
b5ac8292 |
740 | } |
741 | |
ab1c121b |
742 | if (anAspect > 1.0) |
743 | { |
744 | aDXHalf *= anAspect; |
745 | } |
746 | else |
747 | { |
748 | aDYHalf /= anAspect; |
749 | } |
750 | |
b5ac8292 |
751 | // sets right of frustum based on aspect ratio |
197ac94e |
752 | Elem_t aLeft = -aDXHalf; |
753 | Elem_t aRight = aDXHalf; |
754 | Elem_t aBot = -aDYHalf; |
755 | Elem_t aTop = aDYHalf; |
b5ac8292 |
756 | |
197ac94e |
757 | Elem_t aIOD = myIODType == IODType_Relative |
758 | ? static_cast<Elem_t> (myIOD * Distance()) |
759 | : static_cast<Elem_t> (myIOD); |
b5ac8292 |
760 | |
197ac94e |
761 | Elem_t aFocus = myZFocusType == FocusType_Relative |
762 | ? static_cast<Elem_t> (myZFocus * Distance()) |
763 | : static_cast<Elem_t> (myZFocus); |
b5ac8292 |
764 | |
765 | switch (myProjType) |
766 | { |
767 | case Projection_Orthographic : |
197ac94e |
768 | OrthoProj (aLeft, aRight, aBot, aTop, aZNear, aZFar, *theMatrices.MProjection); |
b5ac8292 |
769 | break; |
770 | |
771 | case Projection_Perspective : |
197ac94e |
772 | PerspectiveProj (aLeft, aRight, aBot, aTop, aZNear, aZFar, *theMatrices.MProjection); |
b5ac8292 |
773 | break; |
774 | |
775 | case Projection_MonoLeftEye : |
776 | { |
197ac94e |
777 | StereoEyeProj (aLeft, aRight, aBot, aTop, |
778 | aZNear, aZFar, aIOD, aFocus, |
779 | Standard_True, *theMatrices.MProjection); |
38a0206f |
780 | *theMatrices.LProjection = *theMatrices.MProjection; |
b5ac8292 |
781 | break; |
782 | } |
783 | |
784 | case Projection_MonoRightEye : |
785 | { |
197ac94e |
786 | StereoEyeProj (aLeft, aRight, aBot, aTop, |
787 | aZNear, aZFar, aIOD, aFocus, |
788 | Standard_False, *theMatrices.MProjection); |
38a0206f |
789 | *theMatrices.RProjection = *theMatrices.MProjection; |
b5ac8292 |
790 | break; |
791 | } |
792 | |
793 | case Projection_Stereo : |
794 | { |
197ac94e |
795 | PerspectiveProj (aLeft, aRight, aBot, aTop, aZNear, aZFar, *theMatrices.MProjection); |
b5ac8292 |
796 | |
197ac94e |
797 | StereoEyeProj (aLeft, aRight, aBot, aTop, |
798 | aZNear, aZFar, aIOD, aFocus, |
799 | Standard_True, |
800 | *theMatrices.LProjection); |
b5ac8292 |
801 | |
197ac94e |
802 | StereoEyeProj (aLeft, aRight, aBot, aTop, |
803 | aZNear, aZFar, aIOD, aFocus, |
804 | Standard_False, |
805 | *theMatrices.RProjection); |
b5ac8292 |
806 | break; |
807 | } |
808 | } |
197ac94e |
809 | |
810 | return theMatrices; // for inline accessors |
b5ac8292 |
811 | } |
812 | |
813 | // ======================================================================= |
814 | // function : UpdateOrientation |
815 | // purpose : |
816 | // ======================================================================= |
197ac94e |
817 | template <typename Elem_t> |
818 | Graphic3d_Camera::TransformMatrices<Elem_t>& |
819 | Graphic3d_Camera::UpdateOrientation (TransformMatrices<Elem_t>& theMatrices) const |
b5ac8292 |
820 | { |
197ac94e |
821 | if (theMatrices.IsOrientationValid()) |
b5ac8292 |
822 | { |
197ac94e |
823 | return theMatrices; // for inline accessors |
b5ac8292 |
824 | } |
825 | |
197ac94e |
826 | theMatrices.InitOrientation(); |
827 | |
828 | NCollection_Vec3<Elem_t> anEye (static_cast<Elem_t> (myEye.X()), |
829 | static_cast<Elem_t> (myEye.Y()), |
830 | static_cast<Elem_t> (myEye.Z())); |
831 | |
832 | NCollection_Vec3<Elem_t> aCenter (static_cast<Elem_t> (myCenter.X()), |
833 | static_cast<Elem_t> (myCenter.Y()), |
834 | static_cast<Elem_t> (myCenter.Z())); |
b5ac8292 |
835 | |
197ac94e |
836 | NCollection_Vec3<Elem_t> anUp (static_cast<Elem_t> (myUp.X()), |
837 | static_cast<Elem_t> (myUp.Y()), |
838 | static_cast<Elem_t> (myUp.Z())); |
b5ac8292 |
839 | |
197ac94e |
840 | NCollection_Vec3<Elem_t> anAxialScale (static_cast<Elem_t> (myAxialScale.X()), |
841 | static_cast<Elem_t> (myAxialScale.Y()), |
842 | static_cast<Elem_t> (myAxialScale.Z())); |
b5ac8292 |
843 | |
197ac94e |
844 | LookOrientation (anEye, aCenter, anUp, anAxialScale, *theMatrices.Orientation); |
b5ac8292 |
845 | |
197ac94e |
846 | return theMatrices; // for inline accessors |
847 | } |
b5ac8292 |
848 | |
197ac94e |
849 | // ======================================================================= |
850 | // function : InvalidateProjection |
851 | // purpose : |
852 | // ======================================================================= |
853 | void Graphic3d_Camera::InvalidateProjection() |
854 | { |
855 | myMatricesD.ResetProjection(); |
856 | myMatricesF.ResetProjection(); |
825aa485 |
857 | myWorldViewProjState.ProjectionState() = (Standard_Size)Standard_Atomic_Increment (&THE_STATE_COUNTER); |
197ac94e |
858 | } |
b5ac8292 |
859 | |
197ac94e |
860 | // ======================================================================= |
861 | // function : InvalidateOrientation |
862 | // purpose : |
863 | // ======================================================================= |
864 | void Graphic3d_Camera::InvalidateOrientation() |
865 | { |
866 | myMatricesD.ResetOrientation(); |
867 | myMatricesF.ResetOrientation(); |
825aa485 |
868 | myWorldViewProjState.WorldViewState() = (Standard_Size)Standard_Atomic_Increment (&THE_STATE_COUNTER); |
b5ac8292 |
869 | } |
870 | |
871 | // ======================================================================= |
872 | // function : OrthoProj |
873 | // purpose : |
874 | // ======================================================================= |
197ac94e |
875 | template <typename Elem_t> |
876 | void Graphic3d_Camera::OrthoProj (const Elem_t theLeft, |
877 | const Elem_t theRight, |
878 | const Elem_t theBottom, |
879 | const Elem_t theTop, |
880 | const Elem_t theNear, |
881 | const Elem_t theFar, |
882 | NCollection_Mat4<Elem_t>& theOutMx) |
b5ac8292 |
883 | { |
884 | // row 0 |
197ac94e |
885 | theOutMx.ChangeValue (0, 0) = Elem_t (2.0) / (theRight - theLeft); |
886 | theOutMx.ChangeValue (0, 1) = Elem_t (0.0); |
887 | theOutMx.ChangeValue (0, 2) = Elem_t (0.0); |
b5ac8292 |
888 | theOutMx.ChangeValue (0, 3) = - (theRight + theLeft) / (theRight - theLeft); |
889 | |
890 | // row 1 |
197ac94e |
891 | theOutMx.ChangeValue (1, 0) = Elem_t (0.0); |
892 | theOutMx.ChangeValue (1, 1) = Elem_t (2.0) / (theTop - theBottom); |
893 | theOutMx.ChangeValue (1, 2) = Elem_t (0.0); |
b5ac8292 |
894 | theOutMx.ChangeValue (1, 3) = - (theTop + theBottom) / (theTop - theBottom); |
895 | |
896 | // row 2 |
197ac94e |
897 | theOutMx.ChangeValue (2, 0) = Elem_t (0.0); |
898 | theOutMx.ChangeValue (2, 1) = Elem_t (0.0); |
899 | theOutMx.ChangeValue (2, 2) = Elem_t (-2.0) / (theFar - theNear); |
b5ac8292 |
900 | theOutMx.ChangeValue (2, 3) = - (theFar + theNear) / (theFar - theNear); |
901 | |
902 | // row 3 |
197ac94e |
903 | theOutMx.ChangeValue (3, 0) = Elem_t (0.0); |
904 | theOutMx.ChangeValue (3, 1) = Elem_t (0.0); |
905 | theOutMx.ChangeValue (3, 2) = Elem_t (0.0); |
906 | theOutMx.ChangeValue (3, 3) = Elem_t (1.0); |
b5ac8292 |
907 | } |
908 | |
909 | // ======================================================================= |
910 | // function : PerspectiveProj |
911 | // purpose : |
912 | // ======================================================================= |
197ac94e |
913 | template <typename Elem_t> |
914 | void Graphic3d_Camera::PerspectiveProj (const Elem_t theLeft, |
915 | const Elem_t theRight, |
916 | const Elem_t theBottom, |
917 | const Elem_t theTop, |
918 | const Elem_t theNear, |
919 | const Elem_t theFar, |
920 | NCollection_Mat4<Elem_t>& theOutMx) |
b5ac8292 |
921 | { |
922 | // column 0 |
197ac94e |
923 | theOutMx.ChangeValue (0, 0) = (Elem_t (2.0) * theNear) / (theRight - theLeft); |
924 | theOutMx.ChangeValue (1, 0) = Elem_t (0.0); |
925 | theOutMx.ChangeValue (2, 0) = Elem_t (0.0); |
926 | theOutMx.ChangeValue (3, 0) = Elem_t (0.0); |
b5ac8292 |
927 | |
928 | // column 1 |
197ac94e |
929 | theOutMx.ChangeValue (0, 1) = Elem_t (0.0); |
930 | theOutMx.ChangeValue (1, 1) = (Elem_t (2.0) * theNear) / (theTop - theBottom); |
931 | theOutMx.ChangeValue (2, 1) = Elem_t (0.0); |
932 | theOutMx.ChangeValue (3, 1) = Elem_t (0.0); |
b5ac8292 |
933 | |
934 | // column 2 |
935 | theOutMx.ChangeValue (0, 2) = (theRight + theLeft) / (theRight - theLeft); |
936 | theOutMx.ChangeValue (1, 2) = (theTop + theBottom) / (theTop - theBottom); |
937 | theOutMx.ChangeValue (2, 2) = -(theFar + theNear) / (theFar - theNear); |
197ac94e |
938 | theOutMx.ChangeValue (3, 2) = Elem_t (-1.0); |
b5ac8292 |
939 | |
940 | // column 3 |
197ac94e |
941 | theOutMx.ChangeValue (0, 3) = Elem_t (0.0); |
942 | theOutMx.ChangeValue (1, 3) = Elem_t (0.0); |
943 | theOutMx.ChangeValue (2, 3) = -(Elem_t (2.0) * theFar * theNear) / (theFar - theNear); |
944 | theOutMx.ChangeValue (3, 3) = Elem_t (0.0); |
b5ac8292 |
945 | } |
946 | |
947 | // ======================================================================= |
948 | // function : StereoEyeProj |
949 | // purpose : |
950 | // ======================================================================= |
197ac94e |
951 | template <typename Elem_t> |
952 | void Graphic3d_Camera::StereoEyeProj (const Elem_t theLeft, |
953 | const Elem_t theRight, |
954 | const Elem_t theBottom, |
955 | const Elem_t theTop, |
956 | const Elem_t theNear, |
957 | const Elem_t theFar, |
958 | const Elem_t theIOD, |
959 | const Elem_t theZFocus, |
960 | const Standard_Boolean theIsLeft, |
961 | NCollection_Mat4<Elem_t>& theOutMx) |
b5ac8292 |
962 | { |
197ac94e |
963 | Elem_t aDx = theIsLeft ? Elem_t (0.5) * theIOD : Elem_t (-0.5) * theIOD; |
964 | Elem_t aDXStereoShift = aDx * theNear / theZFocus; |
b5ac8292 |
965 | |
966 | // construct eye projection matrix |
967 | PerspectiveProj (theLeft + aDXStereoShift, |
968 | theRight + aDXStereoShift, |
969 | theBottom, theTop, theNear, theFar, |
b5ac8292 |
970 | theOutMx); |
971 | |
197ac94e |
972 | if (theIOD != Elem_t (0.0)) |
b5ac8292 |
973 | { |
974 | // X translation to cancel parallax |
197ac94e |
975 | theOutMx.Translate (NCollection_Vec3<Elem_t> (aDx, Elem_t (0.0), Elem_t (0.0))); |
b5ac8292 |
976 | } |
977 | } |
978 | |
979 | // ======================================================================= |
980 | // function : LookOrientation |
981 | // purpose : |
982 | // ======================================================================= |
197ac94e |
983 | template <typename Elem_t> |
984 | void Graphic3d_Camera::LookOrientation (const NCollection_Vec3<Elem_t>& theEye, |
985 | const NCollection_Vec3<Elem_t>& theLookAt, |
986 | const NCollection_Vec3<Elem_t>& theUpDir, |
987 | const NCollection_Vec3<Elem_t>& theAxialScale, |
988 | NCollection_Mat4<Elem_t>& theOutMx) |
b5ac8292 |
989 | { |
197ac94e |
990 | NCollection_Vec3<Elem_t> aForward = theLookAt - theEye; |
b5ac8292 |
991 | aForward.Normalize(); |
992 | |
993 | // side = forward x up |
197ac94e |
994 | NCollection_Vec3<Elem_t> aSide = NCollection_Vec3<Elem_t>::Cross (aForward, theUpDir); |
b5ac8292 |
995 | aSide.Normalize(); |
996 | |
997 | // recompute up as: up = side x forward |
197ac94e |
998 | NCollection_Vec3<Elem_t> anUp = NCollection_Vec3<Elem_t>::Cross (aSide, aForward); |
b5ac8292 |
999 | |
197ac94e |
1000 | NCollection_Mat4<Elem_t> aLookMx; |
b5ac8292 |
1001 | aLookMx.SetRow (0, aSide); |
1002 | aLookMx.SetRow (1, anUp); |
1003 | aLookMx.SetRow (2, -aForward); |
1004 | |
197ac94e |
1005 | theOutMx.InitIdentity(); |
1006 | theOutMx.Multiply (aLookMx); |
b5ac8292 |
1007 | theOutMx.Translate (-theEye); |
1008 | |
197ac94e |
1009 | NCollection_Mat4<Elem_t> anAxialScaleMx; |
b5ac8292 |
1010 | anAxialScaleMx.ChangeValue (0, 0) = theAxialScale.x(); |
1011 | anAxialScaleMx.ChangeValue (1, 1) = theAxialScale.y(); |
1012 | anAxialScaleMx.ChangeValue (2, 2) = theAxialScale.z(); |
1013 | |
1014 | theOutMx.Multiply (anAxialScaleMx); |
1015 | } |
6bc6a6fc |
1016 | |
1017 | //============================================================================= |
1018 | //function : ZFitAll |
1019 | //purpose : |
1020 | //============================================================================= |
1021 | void Graphic3d_Camera::ZFitAll (const Standard_Real theScaleFactor, const Bnd_Box& theMinMax, const Bnd_Box& theGraphicBB) |
1022 | { |
1023 | Standard_ASSERT_RAISE (theScaleFactor > 0.0, "Zero or negative scale factor is not allowed."); |
1024 | |
ea764884 |
1025 | // Method changes zNear and zFar parameters of camera so as to fit graphical structures |
1026 | // by their graphical boundaries. It precisely fits min max boundaries of primary application |
1027 | // objects (second argument), while it can sacrifice the real graphical boundaries of the |
1028 | // scene with infinite or helper objects (third argument) for the sake of perspective projection. |
ed063270 |
1029 | if (theGraphicBB.IsVoid()) |
6bc6a6fc |
1030 | { |
ea764884 |
1031 | SetZRange (DEFAULT_ZNEAR, DEFAULT_ZFAR); |
6bc6a6fc |
1032 | return; |
1033 | } |
1034 | |
ea764884 |
1035 | // Measure depth of boundary points from camera eye. |
ed063270 |
1036 | NCollection_Sequence<gp_Pnt> aPntsToMeasure; |
1037 | |
ea764884 |
1038 | Standard_Real aGraphicBB[6]; |
ed063270 |
1039 | theGraphicBB.Get (aGraphicBB[0], aGraphicBB[1], aGraphicBB[2], aGraphicBB[3], aGraphicBB[4], aGraphicBB[5]); |
1040 | |
1041 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[0], aGraphicBB[1], aGraphicBB[2])); |
1042 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[0], aGraphicBB[1], aGraphicBB[5])); |
1043 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[0], aGraphicBB[4], aGraphicBB[2])); |
1044 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[0], aGraphicBB[4], aGraphicBB[5])); |
1045 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[3], aGraphicBB[1], aGraphicBB[2])); |
1046 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[3], aGraphicBB[1], aGraphicBB[5])); |
1047 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[3], aGraphicBB[4], aGraphicBB[2])); |
1048 | aPntsToMeasure.Append (gp_Pnt (aGraphicBB[3], aGraphicBB[4], aGraphicBB[5])); |
1049 | |
5a19c303 |
1050 | Standard_Boolean isFiniteMinMax = !theMinMax.IsVoid() && !theMinMax.IsWhole(); |
1051 | |
1052 | if (isFiniteMinMax) |
6bc6a6fc |
1053 | { |
ea764884 |
1054 | Standard_Real aMinMax[6]; |
ed063270 |
1055 | theMinMax.Get (aMinMax[0], aMinMax[1], aMinMax[2], aMinMax[3], aMinMax[4], aMinMax[5]); |
1056 | |
1057 | aPntsToMeasure.Append (gp_Pnt (aMinMax[0], aMinMax[1], aMinMax[2])); |
1058 | aPntsToMeasure.Append (gp_Pnt (aMinMax[0], aMinMax[1], aMinMax[5])); |
1059 | aPntsToMeasure.Append (gp_Pnt (aMinMax[0], aMinMax[4], aMinMax[2])); |
1060 | aPntsToMeasure.Append (gp_Pnt (aMinMax[0], aMinMax[4], aMinMax[5])); |
1061 | aPntsToMeasure.Append (gp_Pnt (aMinMax[3], aMinMax[1], aMinMax[2])); |
1062 | aPntsToMeasure.Append (gp_Pnt (aMinMax[3], aMinMax[1], aMinMax[5])); |
1063 | aPntsToMeasure.Append (gp_Pnt (aMinMax[3], aMinMax[4], aMinMax[2])); |
1064 | aPntsToMeasure.Append (gp_Pnt (aMinMax[3], aMinMax[4], aMinMax[5])); |
1065 | } |
6bc6a6fc |
1066 | |
ea764884 |
1067 | // Camera eye plane. |
6bc6a6fc |
1068 | gp_Dir aCamDir = Direction(); |
1069 | gp_Pnt aCamEye = myEye; |
1070 | gp_Pln aCamPln (aCamEye, aCamDir); |
1071 | |
5a19c303 |
1072 | Standard_Real aModelMinDist = RealLast(); |
1073 | Standard_Real aModelMaxDist = RealFirst(); |
1074 | Standard_Real aGraphMinDist = RealLast(); |
1075 | Standard_Real aGraphMaxDist = RealFirst(); |
6bc6a6fc |
1076 | |
1077 | const gp_XYZ& anAxialScale = myAxialScale; |
1078 | |
ea764884 |
1079 | // Get minimum and maximum distances to the eye plane. |
ed063270 |
1080 | Standard_Integer aCounter = 0; |
1081 | NCollection_Sequence<gp_Pnt>::Iterator aPntIt(aPntsToMeasure); |
1082 | for (; aPntIt.More(); aPntIt.Next()) |
6bc6a6fc |
1083 | { |
ed063270 |
1084 | gp_Pnt aMeasurePnt = aPntIt.Value(); |
6bc6a6fc |
1085 | |
1086 | aMeasurePnt = gp_Pnt (aMeasurePnt.X() * anAxialScale.X(), |
ed063270 |
1087 | aMeasurePnt.Y() * anAxialScale.Y(), |
1088 | aMeasurePnt.Z() * anAxialScale.Z()); |
6bc6a6fc |
1089 | |
1090 | Standard_Real aDistance = aCamPln.Distance (aMeasurePnt); |
1091 | |
ea764884 |
1092 | // Check if the camera is intruded into the scene. |
6bc6a6fc |
1093 | if (aCamDir.IsOpposite (gp_Vec (aCamEye, aMeasurePnt), M_PI * 0.5)) |
1094 | { |
1095 | aDistance *= -1; |
1096 | } |
1097 | |
ea764884 |
1098 | // The first eight points are from theGraphicBB, the last eight points are from theMinMax (can be absent). |
5a19c303 |
1099 | Standard_Real& aChangeMinDist = aCounter >= 8 ? aModelMinDist : aGraphMinDist; |
1100 | Standard_Real& aChangeMaxDist = aCounter >= 8 ? aModelMaxDist : aGraphMaxDist; |
6bc6a6fc |
1101 | aChangeMinDist = Min (aDistance, aChangeMinDist); |
1102 | aChangeMaxDist = Max (aDistance, aChangeMaxDist); |
ed063270 |
1103 | aCounter++; |
6bc6a6fc |
1104 | } |
1105 | |
ea764884 |
1106 | // Compute depth of bounding box center. |
5a19c303 |
1107 | Standard_Real aMidDepth = (aGraphMinDist + aGraphMaxDist) * 0.5; |
1108 | Standard_Real aHalfDepth = (aGraphMaxDist - aGraphMinDist) * 0.5; |
6bc6a6fc |
1109 | |
ea764884 |
1110 | // Compute enlarged or shrank near and far z ranges. |
35c4a17c |
1111 | Standard_Real aZNear = aMidDepth - aHalfDepth * theScaleFactor; |
1112 | Standard_Real aZFar = aMidDepth + aHalfDepth * theScaleFactor; |
6bc6a6fc |
1113 | |
1114 | if (!IsOrthographic()) |
1115 | { |
ea764884 |
1116 | // Everything is behind the perspective camera. |
1117 | if (aZFar < zEpsilon()) |
6bc6a6fc |
1118 | { |
ea764884 |
1119 | SetZRange (DEFAULT_ZNEAR, DEFAULT_ZFAR); |
1120 | return; |
6bc6a6fc |
1121 | } |
6bc6a6fc |
1122 | } |
1123 | |
ea764884 |
1124 | // |
1125 | // Consider clipping errors due to double to single precision floating-point conversion. |
1126 | // |
1127 | |
1128 | // Model to view transformation performs translation of points against eye position |
1129 | // in three dimensions. Both point coordinate and eye position values are converted from |
1130 | // double to single precision floating point numbers producing conversion errors. |
1131 | // Epsilon (Mod) * 3.0 should safely compensate precision error for z coordinate after |
1132 | // translation assuming that the: |
1133 | // Epsilon (Eye.Mod()) * 3.0 > Epsilon (Eye.X()) + Epsilon (Eye.Y()) + Epsilon (Eye.Z()). |
1134 | Standard_Real aEyeConf = 3.0 * zEpsilon (myEye.XYZ().Modulus()); |
1135 | |
1136 | // Model to view transformation performs rotation of points according to view direction. |
1137 | // New z coordinate is computed as a multiplication of point's x, y, z coordinates by the |
1138 | // "forward" direction vector's x, y, z coordinates. Both point's and "z" direction vector's |
1139 | // values are converted from double to single precision floating point numbers producing |
1140 | // conversion errors. |
1141 | // Epsilon (Mod) * 6.0 should safely compensate the precision errors for the multiplication |
1142 | // of point coordinates by direction vector. |
1143 | gp_Pnt aGraphicMin = theGraphicBB.CornerMin(); |
1144 | gp_Pnt aGraphicMax = theGraphicBB.CornerMax(); |
1145 | |
1146 | Standard_Real aModelConf = 6.0 * zEpsilon (aGraphicMin.XYZ().Modulus()) + |
1147 | 6.0 * zEpsilon (aGraphicMax.XYZ().Modulus()); |
1148 | |
1149 | // Compensate floating point conversion errors by increasing zNear, zFar to avoid clipping. |
1150 | aZNear -= zEpsilon (aZNear) + aEyeConf + aModelConf; |
1151 | aZFar += zEpsilon (aZFar) + aEyeConf + aModelConf; |
1152 | |
1153 | if (!IsOrthographic()) |
6bc6a6fc |
1154 | { |
5a19c303 |
1155 | // For perspective projection, the value of z in normalized device coordinates is non-linear |
1156 | // function of eye z coordinate. For fixed-point depth representation resolution of z in |
1157 | // model-view space will grow towards zFar plane and its scale depends mostly on how far is zNear |
1158 | // against camera's eye. The purpose of the code below is to select most appropriate zNear distance |
1159 | // to balance between clipping (less zNear, more chances to observe closely small models without clipping) |
1160 | // and resolution of depth. A well applicable criteria to this is a ratio between resolution of z at center |
1161 | // of model boundaries and the distance to that center point. The ratio is chosen empirically and validated |
1162 | // by tests database. It is considered to be ~0.001 (0.1%) for 24 bit depth buffer, for less depth bitness |
1163 | // the zNear will be placed similarly giving lower resolution. |
1164 | // Approximation of the formula for respectively large z range is: |
1165 | // zNear = [z * (1 + k) / (k * c)], |
1166 | // where: |
1167 | // z - distance to center of model boundaries; |
1168 | // k - chosen ratio, c - capacity of depth buffer; |
1169 | // k = 0.001, k * c = 1677.216, (1 + k) / (k * c) ~ 5.97E-4 |
1170 | // |
1171 | // The function uses center of model boundaries computed from "theMinMax" boundaries (instead of using real |
1172 | // graphical boundaries of all displayed objects). That means that it can sacrifice resolution of presentation |
1173 | // of non primary ("infinite") application graphical objects in favor of better perspective projection of the |
1174 | // small applicative objects measured with "theMinMax" values. |
1175 | Standard_Real aZRange = isFiniteMinMax ? aModelMaxDist - aModelMinDist : aGraphMaxDist - aGraphMinDist; |
1176 | Standard_Real aZMin = isFiniteMinMax ? aModelMinDist : aGraphMinDist; |
1177 | Standard_Real aZ = aZMin < 0 ? aZRange / 2.0 : aZRange / 2.0 + aZMin; |
1178 | Standard_Real aZNearMin = aZ * 5.97E-4; |
1179 | if (aZNear < aZNearMin) |
1180 | { |
1181 | // Clip zNear according to the minimum value matching the quality. |
1182 | aZNear = aZNearMin; |
1183 | } |
1184 | else |
1185 | { |
1186 | // Compensate zNear conversion errors for perspective projection. |
1187 | aZNear -= aZFar * zEpsilon (aZNear) / (aZFar - zEpsilon (aZNear)); |
1188 | } |
1189 | |
1190 | // Compensate zFar conversion errors for perspective projection. |
1191 | aZFar += zEpsilon (aZFar); |
ea764884 |
1192 | |
1193 | // Ensure that after all the zNear is not a negative value. |
1194 | if (aZNear < zEpsilon()) |
1195 | { |
1196 | aZNear = zEpsilon(); |
1197 | } |
6bc6a6fc |
1198 | } |
1199 | |
1200 | SetZRange (aZNear, aZFar); |
1201 | } |