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