Bullet Collision Detection & Physics Library: btVoronoiSimplexSolver.cpp Source File

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btVoronoiSimplexSolver.cpp
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1
2/*
3Bullet Continuous Collision Detection and Physics Library
4Copyright (c) 2003-2006 Erwin Coumans https://bulletphysics.org
5
6This software is provided 'as-is', without any express or implied warranty.
7In no event will the authors be held liable for any damages arising from the use of this software.
8Permission is granted to anyone to use this software for any purpose,
9including commercial applications, and to alter it and redistribute it freely,
10subject to the following restrictions:
11
121. The origin of this software must not be misrepresented; you must not claim that you wrote the original software. If you use this software in a product, an acknowledgment in the product documentation would be appreciated but is not required.
132. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
143. This notice may not be removed or altered from any source distribution.
15
16 Elsevier CDROM license agreements grants nonexclusive license to use the software
17 for any purpose, commercial or non-commercial as long as the following credit is included
18 identifying the original source of the software:
19
20 Parts of the source are "from the book Real-Time Collision Detection by
21 Christer Ericson, published by Morgan Kaufmann Publishers,
22 (c) 2005 Elsevier Inc."
23
24*/
25
26#include "btVoronoiSimplexSolver.h"
27
28#define VERTA 0
29#define VERTB 1
30#define VERTC 2
31#define VERTD 3
32
33#define CATCH_DEGENERATE_TETRAHEDRON 1
34 void btVoronoiSimplexSolver::removeVertex(int index)
35{
36 btAssert(m_numVertices > 0);
37 m_numVertices--;
38 m_simplexVectorW[index] = m_simplexVectorW[m_numVertices];
39 m_simplexPointsP[index] = m_simplexPointsP[m_numVertices];
40 m_simplexPointsQ[index] = m_simplexPointsQ[m_numVertices];
41}
42
43 void btVoronoiSimplexSolver::reduceVertices(const btUsageBitfield& usedVerts)
44{
45 if ((numVertices() >= 4) && (!usedVerts.usedVertexD))
46 removeVertex(3);
47
48 if ((numVertices() >= 3) && (!usedVerts.usedVertexC))
49 removeVertex(2);
50
51 if ((numVertices() >= 2) && (!usedVerts.usedVertexB))
52 removeVertex(1);
53
54 if ((numVertices() >= 1) && (!usedVerts.usedVertexA))
55 removeVertex(0);
56}
57
58//clear the simplex, remove all the vertices
59 void btVoronoiSimplexSolver::reset()
60{
61 m_cachedValidClosest = false;
62 m_numVertices = 0;
63 m_needsUpdate = true;
64 m_lastW = btVector3(btScalar(BT_LARGE_FLOAT), btScalar(BT_LARGE_FLOAT), btScalar(BT_LARGE_FLOAT));
65 m_cachedBC.reset();
66}
67
68//add a vertex
69 void btVoronoiSimplexSolver::addVertex(const btVector3& w, const btVector3& p, const btVector3& q)
70{
71 m_lastW = w;
72 m_needsUpdate = true;
73
74 m_simplexVectorW[m_numVertices] = w;
75 m_simplexPointsP[m_numVertices] = p;
76 m_simplexPointsQ[m_numVertices] = q;
77
78 m_numVertices++;
79}
80
81 bool btVoronoiSimplexSolver::updateClosestVectorAndPoints()
82{
83 if (m_needsUpdate)
84 {
85 m_cachedBC.reset();
86
87 m_needsUpdate = false;
88
89 switch (numVertices())
90 {
91 case 0:
92 m_cachedValidClosest = false;
93 break;
94 case 1:
95 {
96 m_cachedP1 = m_simplexPointsP[0];
97 m_cachedP2 = m_simplexPointsQ[0];
98 m_cachedV = m_cachedP1 - m_cachedP2; //== m_simplexVectorW[0]
99 m_cachedBC.reset();
100 m_cachedBC.setBarycentricCoordinates(btScalar(1.), btScalar(0.), btScalar(0.), btScalar(0.));
101 m_cachedValidClosest = m_cachedBC.isValid();
102 break;
103 };
104 case 2:
105 {
106 //closest point origin from line segment
107 const btVector3& from = m_simplexVectorW[0];
108 const btVector3& to = m_simplexVectorW[1];
109 btVector3 nearest;
110
111 btVector3 p(btScalar(0.), btScalar(0.), btScalar(0.));
112 btVector3 diff = p - from;
113 btVector3 v = to - from;
114 btScalar t = v.dot(diff);
115
116 if (t > 0)
117 {
118 btScalar dotVV = v.dot(v);
119 if (t < dotVV)
120 {
121 t /= dotVV;
122 diff -= t * v;
123 m_cachedBC.m_usedVertices.usedVertexA = true;
124 m_cachedBC.m_usedVertices.usedVertexB = true;
125 }
126 else
127 {
128 t = 1;
129 diff -= v;
130 //reduce to 1 point
131 m_cachedBC.m_usedVertices.usedVertexB = true;
132 }
133 }
134 else
135 {
136 t = 0;
137 //reduce to 1 point
138 m_cachedBC.m_usedVertices.usedVertexA = true;
139 }
140 m_cachedBC.setBarycentricCoordinates(1 - t, t);
141 nearest = from + t * v;
142
143 m_cachedP1 = m_simplexPointsP[0] + t * (m_simplexPointsP[1] - m_simplexPointsP[0]);
144 m_cachedP2 = m_simplexPointsQ[0] + t * (m_simplexPointsQ[1] - m_simplexPointsQ[0]);
145 m_cachedV = m_cachedP1 - m_cachedP2;
146
147 reduceVertices(m_cachedBC.m_usedVertices);
148
149 m_cachedValidClosest = m_cachedBC.isValid();
150 break;
151 }
152 case 3:
153 {
154 //closest point origin from triangle
155 btVector3 p(btScalar(0.), btScalar(0.), btScalar(0.));
156
157 const btVector3& a = m_simplexVectorW[0];
158 const btVector3& b = m_simplexVectorW[1];
159 const btVector3& c = m_simplexVectorW[2];
160
161 closestPtPointTriangle(p, a, b, c, m_cachedBC);
162 m_cachedP1 = m_simplexPointsP[0] * m_cachedBC.m_barycentricCoords[0] +
163 m_simplexPointsP[1] * m_cachedBC.m_barycentricCoords[1] +
164 m_simplexPointsP[2] * m_cachedBC.m_barycentricCoords[2];
165
166 m_cachedP2 = m_simplexPointsQ[0] * m_cachedBC.m_barycentricCoords[0] +
167 m_simplexPointsQ[1] * m_cachedBC.m_barycentricCoords[1] +
168 m_simplexPointsQ[2] * m_cachedBC.m_barycentricCoords[2];
169
170 m_cachedV = m_cachedP1 - m_cachedP2;
171
172 reduceVertices(m_cachedBC.m_usedVertices);
173 m_cachedValidClosest = m_cachedBC.isValid();
174
175 break;
176 }
177 case 4:
178 {
179 btVector3 p(btScalar(0.), btScalar(0.), btScalar(0.));
180
181 const btVector3& a = m_simplexVectorW[0];
182 const btVector3& b = m_simplexVectorW[1];
183 const btVector3& c = m_simplexVectorW[2];
184 const btVector3& d = m_simplexVectorW[3];
185
186 bool hasSeparation = closestPtPointTetrahedron(p, a, b, c, d, m_cachedBC);
187
188 if (hasSeparation)
189 {
190 m_cachedP1 = m_simplexPointsP[0] * m_cachedBC.m_barycentricCoords[0] +
191 m_simplexPointsP[1] * m_cachedBC.m_barycentricCoords[1] +
192 m_simplexPointsP[2] * m_cachedBC.m_barycentricCoords[2] +
193 m_simplexPointsP[3] * m_cachedBC.m_barycentricCoords[3];
194
195 m_cachedP2 = m_simplexPointsQ[0] * m_cachedBC.m_barycentricCoords[0] +
196 m_simplexPointsQ[1] * m_cachedBC.m_barycentricCoords[1] +
197 m_simplexPointsQ[2] * m_cachedBC.m_barycentricCoords[2] +
198 m_simplexPointsQ[3] * m_cachedBC.m_barycentricCoords[3];
199
200 m_cachedV = m_cachedP1 - m_cachedP2;
201 reduceVertices(m_cachedBC.m_usedVertices);
202 }
203 else
204 {
205 // printf("sub distance got penetration\n");
206
207 if (m_cachedBC.m_degenerate)
208 {
209 m_cachedValidClosest = false;
210 }
211 else
212 {
213 m_cachedValidClosest = true;
214 //degenerate case == false, penetration = true + zero
215 m_cachedV.setValue(btScalar(0.), btScalar(0.), btScalar(0.));
216 }
217 break;
218 }
219
220 m_cachedValidClosest = m_cachedBC.isValid();
221
222 //closest point origin from tetrahedron
223 break;
224 }
225 default:
226 {
227 m_cachedValidClosest = false;
228 }
229 };
230 }
231
232 return m_cachedValidClosest;
233}
234
235//return/calculate the closest vertex
236 bool btVoronoiSimplexSolver::closest(btVector3& v)
237{
238 bool succes = updateClosestVectorAndPoints();
239 v = m_cachedV;
240 return succes;
241}
242
243 btScalar btVoronoiSimplexSolver::maxVertex()
244{
245 int i, numverts = numVertices();
246 btScalar maxV = btScalar(0.);
247 for (i = 0; i < numverts; i++)
248 {
249 btScalar curLen2 = m_simplexVectorW[i].length2();
250 if (maxV < curLen2)
251 maxV = curLen2;
252 }
253 return maxV;
254}
255
256//return the current simplex
257 int btVoronoiSimplexSolver::getSimplex(btVector3* pBuf, btVector3* qBuf, btVector3* yBuf) const
258{
259 int i;
260 for (i = 0; i < numVertices(); i++)
261 {
262 yBuf[i] = m_simplexVectorW[i];
263 pBuf[i] = m_simplexPointsP[i];
264 qBuf[i] = m_simplexPointsQ[i];
265 }
266 return numVertices();
267}
268
269 bool btVoronoiSimplexSolver::inSimplex(const btVector3& w)
270{
271 bool found = false;
272 int i, numverts = numVertices();
273 //btScalar maxV = btScalar(0.);
274
275 //w is in the current (reduced) simplex
276 for (i = 0; i < numverts; i++)
277 {
278#ifdef BT_USE_EQUAL_VERTEX_THRESHOLD
279 if (m_simplexVectorW[i].distance2(w) <= m_equalVertexThreshold)
280#else
281 if (m_simplexVectorW[i] == w)
282#endif
283 {
284 found = true;
285 break;
286 }
287 }
288
289 //check in case lastW is already removed
290 if (w == m_lastW)
291 return true;
292
293 return found;
294}
295
296 void btVoronoiSimplexSolver::backup_closest(btVector3& v)
297{
298 v = m_cachedV;
299}
300
301 bool btVoronoiSimplexSolver::emptySimplex() const
302{
303 return (numVertices() == 0);
304}
305
306 void btVoronoiSimplexSolver::compute_points(btVector3& p1, btVector3& p2)
307{
308 updateClosestVectorAndPoints();
309 p1 = m_cachedP1;
310 p2 = m_cachedP2;
311}
312
313 bool btVoronoiSimplexSolver::closestPtPointTriangle(const btVector3& p, const btVector3& a, const btVector3& b, const btVector3& c, btSubSimplexClosestResult& result)
314{
315 result.m_usedVertices.reset();
316
317 // Check if P in vertex region outside A
318 btVector3 ab = b - a;
319 btVector3 ac = c - a;
320 btVector3 ap = p - a;
321 btScalar d1 = ab.dot(ap);
322 btScalar d2 = ac.dot(ap);
323 if (d1 <= btScalar(0.0) && d2 <= btScalar(0.0))
324 {
325 result.m_closestPointOnSimplex = a;
326 result.m_usedVertices.usedVertexA = true;
327 result.setBarycentricCoordinates(1, 0, 0);
328 return true; // a; // barycentric coordinates (1,0,0)
329 }
330
331 // Check if P in vertex region outside B
332 btVector3 bp = p - b;
333 btScalar d3 = ab.dot(bp);
334 btScalar d4 = ac.dot(bp);
335 if (d3 >= btScalar(0.0) && d4 <= d3)
336 {
337 result.m_closestPointOnSimplex = b;
338 result.m_usedVertices.usedVertexB = true;
339 result.setBarycentricCoordinates(0, 1, 0);
340
341 return true; // b; // barycentric coordinates (0,1,0)
342 }
343 // Check if P in edge region of AB, if so return projection of P onto AB
344 btScalar vc = d1 * d4 - d3 * d2;
345 if (vc <= btScalar(0.0) && d1 >= btScalar(0.0) && d3 <= btScalar(0.0))
346 {
347 btScalar v = d1 / (d1 - d3);
348 result.m_closestPointOnSimplex = a + v * ab;
349 result.m_usedVertices.usedVertexA = true;
350 result.m_usedVertices.usedVertexB = true;
351 result.setBarycentricCoordinates(1 - v, v, 0);
352 return true;
353 //return a + v * ab; // barycentric coordinates (1-v,v,0)
354 }
355
356 // Check if P in vertex region outside C
357 btVector3 cp = p - c;
358 btScalar d5 = ab.dot(cp);
359 btScalar d6 = ac.dot(cp);
360 if (d6 >= btScalar(0.0) && d5 <= d6)
361 {
362 result.m_closestPointOnSimplex = c;
363 result.m_usedVertices.usedVertexC = true;
364 result.setBarycentricCoordinates(0, 0, 1);
365 return true; //c; // barycentric coordinates (0,0,1)
366 }
367
368 // Check if P in edge region of AC, if so return projection of P onto AC
369 btScalar vb = d5 * d2 - d1 * d6;
370 if (vb <= btScalar(0.0) && d2 >= btScalar(0.0) && d6 <= btScalar(0.0))
371 {
372 btScalar w = d2 / (d2 - d6);
373 result.m_closestPointOnSimplex = a + w * ac;
374 result.m_usedVertices.usedVertexA = true;
375 result.m_usedVertices.usedVertexC = true;
376 result.setBarycentricCoordinates(1 - w, 0, w);
377 return true;
378 //return a + w * ac; // barycentric coordinates (1-w,0,w)
379 }
380
381 // Check if P in edge region of BC, if so return projection of P onto BC
382 btScalar va = d3 * d6 - d5 * d4;
383 if (va <= btScalar(0.0) && (d4 - d3) >= btScalar(0.0) && (d5 - d6) >= btScalar(0.0))
384 {
385 btScalar w = (d4 - d3) / ((d4 - d3) + (d5 - d6));
386
387 result.m_closestPointOnSimplex = b + w * (c - b);
388 result.m_usedVertices.usedVertexB = true;
389 result.m_usedVertices.usedVertexC = true;
390 result.setBarycentricCoordinates(0, 1 - w, w);
391 return true;
392 // return b + w * (c - b); // barycentric coordinates (0,1-w,w)
393 }
394
395 // P inside face region. Compute Q through its barycentric coordinates (u,v,w)
396 btScalar denom = btScalar(1.0) / (va + vb + vc);
397 btScalar v = vb * denom;
398 btScalar w = vc * denom;
399
400 result.m_closestPointOnSimplex = a + ab * v + ac * w;
401 result.m_usedVertices.usedVertexA = true;
402 result.m_usedVertices.usedVertexB = true;
403 result.m_usedVertices.usedVertexC = true;
404 result.setBarycentricCoordinates(1 - v - w, v, w);
405
406 return true;
407 // return a + ab * v + ac * w; // = u*a + v*b + w*c, u = va * denom = btScalar(1.0) - v - w
408}
409
411 int btVoronoiSimplexSolver::pointOutsideOfPlane(const btVector3& p, const btVector3& a, const btVector3& b, const btVector3& c, const btVector3& d)
412{
413 btVector3 normal = (b - a).cross(c - a);
414
415 btScalar signp = (p - a).dot(normal); // [AP AB AC]
416 btScalar signd = (d - a).dot(normal); // [AD AB AC]
417
418#ifdef CATCH_DEGENERATE_TETRAHEDRON
419#ifdef BT_USE_DOUBLE_PRECISION
420 if (signd * signd < (btScalar(1e-8) * btScalar(1e-8)))
421 {
422 return -1;
423 }
424#else
425 if (signd * signd < (btScalar(1e-4) * btScalar(1e-4)))
426 {
427 // printf("affine dependent/degenerate\n");//
428 return -1;
429 }
430#endif
431
432#endif
433 // Points on opposite sides if expression signs are opposite
434 return signp * signd < btScalar(0.);
435}
436
437 bool btVoronoiSimplexSolver::closestPtPointTetrahedron(const btVector3& p, const btVector3& a, const btVector3& b, const btVector3& c, const btVector3& d, btSubSimplexClosestResult& finalResult)
438{
439 btSubSimplexClosestResult tempResult;
440
441 // Start out assuming point inside all halfspaces, so closest to itself
442 finalResult.m_closestPointOnSimplex = p;
443 finalResult.m_usedVertices.reset();
444 finalResult.m_usedVertices.usedVertexA = true;
445 finalResult.m_usedVertices.usedVertexB = true;
446 finalResult.m_usedVertices.usedVertexC = true;
447 finalResult.m_usedVertices.usedVertexD = true;
448
449 int pointOutsideABC = pointOutsideOfPlane(p, a, b, c, d);
450 int pointOutsideACD = pointOutsideOfPlane(p, a, c, d, b);
451 int pointOutsideADB = pointOutsideOfPlane(p, a, d, b, c);
452 int pointOutsideBDC = pointOutsideOfPlane(p, b, d, c, a);
453
454 if (pointOutsideABC < 0 || pointOutsideACD < 0 || pointOutsideADB < 0 || pointOutsideBDC < 0)
455 {
456 finalResult.m_degenerate = true;
457 return false;
458 }
459
460 if (!pointOutsideABC && !pointOutsideACD && !pointOutsideADB && !pointOutsideBDC)
461 {
462 return false;
463 }
464
465 btScalar bestSqDist = FLT_MAX;
466 // If point outside face abc then compute closest point on abc
467 if (pointOutsideABC)
468 {
469 closestPtPointTriangle(p, a, b, c, tempResult);
470 btVector3 q = tempResult.m_closestPointOnSimplex;
471
472 btScalar sqDist = (q - p).dot(q - p);
473 // Update best closest point if (squared) distance is less than current best
474 if (sqDist < bestSqDist)
475 {
476 bestSqDist = sqDist;
477 finalResult.m_closestPointOnSimplex = q;
478 //convert result bitmask!
479 finalResult.m_usedVertices.reset();
480 finalResult.m_usedVertices.usedVertexA = tempResult.m_usedVertices.usedVertexA;
481 finalResult.m_usedVertices.usedVertexB = tempResult.m_usedVertices.usedVertexB;
482 finalResult.m_usedVertices.usedVertexC = tempResult.m_usedVertices.usedVertexC;
483 finalResult.setBarycentricCoordinates(
484 tempResult.m_barycentricCoords[VERTA],
485 tempResult.m_barycentricCoords[VERTB],
486 tempResult.m_barycentricCoords[VERTC],
487 0);
488 }
489 }
490
491 // Repeat test for face acd
492 if (pointOutsideACD)
493 {
494 closestPtPointTriangle(p, a, c, d, tempResult);
495 btVector3 q = tempResult.m_closestPointOnSimplex;
496 //convert result bitmask!
497
498 btScalar sqDist = (q - p).dot(q - p);
499 if (sqDist < bestSqDist)
500 {
501 bestSqDist = sqDist;
502 finalResult.m_closestPointOnSimplex = q;
503 finalResult.m_usedVertices.reset();
504 finalResult.m_usedVertices.usedVertexA = tempResult.m_usedVertices.usedVertexA;
505
506 finalResult.m_usedVertices.usedVertexC = tempResult.m_usedVertices.usedVertexB;
507 finalResult.m_usedVertices.usedVertexD = tempResult.m_usedVertices.usedVertexC;
508 finalResult.setBarycentricCoordinates(
509 tempResult.m_barycentricCoords[VERTA],
510 0,
511 tempResult.m_barycentricCoords[VERTB],
512 tempResult.m_barycentricCoords[VERTC]);
513 }
514 }
515 // Repeat test for face adb
516
517 if (pointOutsideADB)
518 {
519 closestPtPointTriangle(p, a, d, b, tempResult);
520 btVector3 q = tempResult.m_closestPointOnSimplex;
521 //convert result bitmask!
522
523 btScalar sqDist = (q - p).dot(q - p);
524 if (sqDist < bestSqDist)
525 {
526 bestSqDist = sqDist;
527 finalResult.m_closestPointOnSimplex = q;
528 finalResult.m_usedVertices.reset();
529 finalResult.m_usedVertices.usedVertexA = tempResult.m_usedVertices.usedVertexA;
530 finalResult.m_usedVertices.usedVertexB = tempResult.m_usedVertices.usedVertexC;
531
532 finalResult.m_usedVertices.usedVertexD = tempResult.m_usedVertices.usedVertexB;
533 finalResult.setBarycentricCoordinates(
534 tempResult.m_barycentricCoords[VERTA],
535 tempResult.m_barycentricCoords[VERTC],
536 0,
537 tempResult.m_barycentricCoords[VERTB]);
538 }
539 }
540 // Repeat test for face bdc
541
542 if (pointOutsideBDC)
543 {
544 closestPtPointTriangle(p, b, d, c, tempResult);
545 btVector3 q = tempResult.m_closestPointOnSimplex;
546 //convert result bitmask!
547 btScalar sqDist = (q - p).dot(q - p);
548 if (sqDist < bestSqDist)
549 {
550 bestSqDist = sqDist;
551 finalResult.m_closestPointOnSimplex = q;
552 finalResult.m_usedVertices.reset();
553 //
554 finalResult.m_usedVertices.usedVertexB = tempResult.m_usedVertices.usedVertexA;
555 finalResult.m_usedVertices.usedVertexC = tempResult.m_usedVertices.usedVertexC;
556 finalResult.m_usedVertices.usedVertexD = tempResult.m_usedVertices.usedVertexB;
557
558 finalResult.setBarycentricCoordinates(
559 0,
560 tempResult.m_barycentricCoords[VERTA],
561 tempResult.m_barycentricCoords[VERTC],
562 tempResult.m_barycentricCoords[VERTB]);
563 }
564 }
565
566 //help! we ended up full !
567
568 if (finalResult.m_usedVertices.usedVertexA &&
569 finalResult.m_usedVertices.usedVertexB &&
570 finalResult.m_usedVertices.usedVertexC &&
571 finalResult.m_usedVertices.usedVertexD)
572 {
573 return true;
574 }
575
576 return true;
577}
dot
btScalar dot(const btQuaternion &q1, const btQuaternion &q2)
Calculate the dot product between two quaternions.
Definition btQuaternion.h:888
btScalar
float btScalar
The btScalar type abstracts floating point numbers, to easily switch between double and single floati...
Definition btScalar.h:314
BT_LARGE_FLOAT
#define BT_LARGE_FLOAT
Definition btScalar.h:316
btAssert
#define btAssert(x)
Definition btScalar.h:153
VERTA
#define VERTA
Definition btVoronoiSimplexSolver.cpp:28
VERTB
#define VERTB
Definition btVoronoiSimplexSolver.cpp:29
VERTC
#define VERTC
Definition btVoronoiSimplexSolver.cpp:30
btVoronoiSimplexSolver.h
btVector3
btVector3 can be used to represent 3D points and vectors.
Definition btVector3.h:82
btVector3::dot
btScalar dot(const btVector3 &v) const
Return the dot product.
Definition btVector3.h:229
btVector3::setValue
void setValue(const btScalar &_x, const btScalar &_y, const btScalar &_z)
Definition btVector3.h:640
btVector3::length2
btScalar length2() const
Return the length of the vector squared.
Definition btVector3.h:251
btVoronoiSimplexSolver::reduceVertices
void reduceVertices(const btUsageBitfield &usedVerts)
Definition btVoronoiSimplexSolver.cpp:43
btVoronoiSimplexSolver::m_simplexPointsP
btVector3 m_simplexPointsP[VORONOI_SIMPLEX_MAX_VERTS]
Definition btVoronoiSimplexSolver.h:106
btVoronoiSimplexSolver::reset
void reset()
Definition btVoronoiSimplexSolver.cpp:59
btVoronoiSimplexSolver::m_numVertices
int m_numVertices
Definition btVoronoiSimplexSolver.h:103
btVoronoiSimplexSolver::m_lastW
btVector3 m_lastW
Definition btVoronoiSimplexSolver.h:112
btVoronoiSimplexSolver::m_simplexVectorW
btVector3 m_simplexVectorW[VORONOI_SIMPLEX_MAX_VERTS]
Definition btVoronoiSimplexSolver.h:105
btVoronoiSimplexSolver::m_cachedBC
btSubSimplexClosestResult m_cachedBC
Definition btVoronoiSimplexSolver.h:117
btVoronoiSimplexSolver::getSimplex
int getSimplex(btVector3 *pBuf, btVector3 *qBuf, btVector3 *yBuf) const
Definition btVoronoiSimplexSolver.cpp:257
btVoronoiSimplexSolver::addVertex
void addVertex(const btVector3 &w, const btVector3 &p, const btVector3 &q)
Definition btVoronoiSimplexSolver.cpp:69
btVoronoiSimplexSolver::numVertices
int numVertices() const
Definition btVoronoiSimplexSolver.h:167
btVoronoiSimplexSolver::closestPtPointTetrahedron
bool closestPtPointTetrahedron(const btVector3 &p, const btVector3 &a, const btVector3 &b, const btVector3 &c, const btVector3 &d, btSubSimplexClosestResult &finalResult)
Definition btVoronoiSimplexSolver.cpp:437
btVoronoiSimplexSolver::m_cachedValidClosest
bool m_cachedValidClosest
Definition btVoronoiSimplexSolver.h:115
btVoronoiSimplexSolver::inSimplex
bool inSimplex(const btVector3 &w)
Definition btVoronoiSimplexSolver.cpp:269
btVoronoiSimplexSolver::m_needsUpdate
bool m_needsUpdate
Definition btVoronoiSimplexSolver.h:119
btVoronoiSimplexSolver::emptySimplex
bool emptySimplex() const
Definition btVoronoiSimplexSolver.cpp:301
btVoronoiSimplexSolver::pointOutsideOfPlane
int pointOutsideOfPlane(const btVector3 &p, const btVector3 &a, const btVector3 &b, const btVector3 &c, const btVector3 &d)
Test if point p and d lie on opposite sides of plane through abc.
Definition btVoronoiSimplexSolver.cpp:411
btVoronoiSimplexSolver::compute_points
void compute_points(btVector3 &p1, btVector3 &p2)
Definition btVoronoiSimplexSolver.cpp:306
btVoronoiSimplexSolver::m_cachedP1
btVector3 m_cachedP1
Definition btVoronoiSimplexSolver.h:109
btVoronoiSimplexSolver::updateClosestVectorAndPoints
bool updateClosestVectorAndPoints()
Definition btVoronoiSimplexSolver.cpp:81
btVoronoiSimplexSolver::closestPtPointTriangle
bool closestPtPointTriangle(const btVector3 &p, const btVector3 &a, const btVector3 &b, const btVector3 &c, btSubSimplexClosestResult &result)
Definition btVoronoiSimplexSolver.cpp:313
btVoronoiSimplexSolver::closest
bool closest(btVector3 &v)
Definition btVoronoiSimplexSolver.cpp:236
btVoronoiSimplexSolver::m_equalVertexThreshold
btScalar m_equalVertexThreshold
Definition btVoronoiSimplexSolver.h:114
btVoronoiSimplexSolver::m_cachedP2
btVector3 m_cachedP2
Definition btVoronoiSimplexSolver.h:110
btVoronoiSimplexSolver::removeVertex
void removeVertex(int index)
Definition btVoronoiSimplexSolver.cpp:34
btVoronoiSimplexSolver::m_cachedV
btVector3 m_cachedV
Definition btVoronoiSimplexSolver.h:111
btVoronoiSimplexSolver::backup_closest
void backup_closest(btVector3 &v)
Definition btVoronoiSimplexSolver.cpp:296
btVoronoiSimplexSolver::m_simplexPointsQ
btVector3 m_simplexPointsQ[VORONOI_SIMPLEX_MAX_VERTS]
Definition btVoronoiSimplexSolver.h:107
btVoronoiSimplexSolver::maxVertex
btScalar maxVertex()
Definition btVoronoiSimplexSolver.cpp:243
btSubSimplexClosestResult
Definition btVoronoiSimplexSolver.h:57
btSubSimplexClosestResult::isValid
bool isValid()
Definition btVoronoiSimplexSolver.h:72
btSubSimplexClosestResult::reset
void reset()
Definition btVoronoiSimplexSolver.h:66
btSubSimplexClosestResult::setBarycentricCoordinates
void setBarycentricCoordinates(btScalar a=btScalar(0.), btScalar b=btScalar(0.), btScalar c=btScalar(0.), btScalar d=btScalar(0.))
Definition btVoronoiSimplexSolver.h:81
btSubSimplexClosestResult::m_degenerate
bool m_degenerate
Definition btVoronoiSimplexSolver.h:64
btSubSimplexClosestResult::m_usedVertices
btUsageBitfield m_usedVertices
Definition btVoronoiSimplexSolver.h:62
btSubSimplexClosestResult::m_barycentricCoords
btScalar m_barycentricCoords[4]
Definition btVoronoiSimplexSolver.h:63
btSubSimplexClosestResult::m_closestPointOnSimplex
btVector3 m_closestPointOnSimplex
Definition btVoronoiSimplexSolver.h:58
btUsageBitfield
Definition btVoronoiSimplexSolver.h:33
btUsageBitfield::usedVertexC
unsigned short usedVertexC
Definition btVoronoiSimplexSolver.h:48
btUsageBitfield::usedVertexB
unsigned short usedVertexB
Definition btVoronoiSimplexSolver.h:47
btUsageBitfield::reset
void reset()
Definition btVoronoiSimplexSolver.h:39
btUsageBitfield::usedVertexA
unsigned short usedVertexA
Definition btVoronoiSimplexSolver.h:46
btUsageBitfield::usedVertexD
unsigned short usedVertexD
Definition btVoronoiSimplexSolver.h:49