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