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source: code/branches/physics/src/bullet/BulletSoftBody/btSoftBodyHelpers.cpp @ 1989

Last change on this file since 1989 was 1972, checked in by rgrieder, 16 years ago
Downgraded Bullet to latest tagged version: 2.72 That should give us more stability.
Property svn:eol-style set to `native`
File size: 18.4 KB

Line
1	/*
2	Bullet Continuous Collision Detection and Physics Library
3	Copyright (c) 2003-2006 Erwin Coumans http://continuousphysics.com/Bullet/
4
5	This software is provided 'as-is', without any express or implied warranty.
6	In no event will the authors be held liable for any damages arising from the use of this software.
7	Permission is granted to anyone to use this software for any purpose,
8	including commercial applications, and to alter it and redistribute it freely,
9	subject to the following restrictions:
10
11	1. 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.
12	2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software.
13	3. This notice may not be removed or altered from any source distribution.
14	*/
15	///btSoftBodyHelpers.cpp by Nathanael Presson
16
17	#include "btSoftBodyInternals.h"
18	#include <stdio.h>
19	#include <string.h>
20	#include "btSoftBodyHelpers.h"
21	#include "LinearMath/btConvexHull.h"
22
23	//
24	static void drawVertex( btIDebugDraw* idraw,
25	const btVector3& x,btScalar s,const btVector3& c)
26	{
27	idraw->drawLine(x-btVector3(s,0,0),x+btVector3(s,0,0),c);
28	idraw->drawLine(x-btVector3(0,s,0),x+btVector3(0,s,0),c);
29	idraw->drawLine(x-btVector3(0,0,s),x+btVector3(0,0,s),c);
30	}
31
32	//
33	static void drawBox( btIDebugDraw* idraw,
34	const btVector3& mins,
35	const btVector3& maxs,
36	const btVector3& color)
37	{
38	const btVector3 c[]={ btVector3(mins.x(),mins.y(),mins.z()),
39	btVector3(maxs.x(),mins.y(),mins.z()),
40	btVector3(maxs.x(),maxs.y(),mins.z()),
41	btVector3(mins.x(),maxs.y(),mins.z()),
42	btVector3(mins.x(),mins.y(),maxs.z()),
43	btVector3(maxs.x(),mins.y(),maxs.z()),
44	btVector3(maxs.x(),maxs.y(),maxs.z()),
45	btVector3(mins.x(),maxs.y(),maxs.z())};
46	idraw->drawLine(c[0],c[1],color);idraw->drawLine(c[1],c[2],color);
47	idraw->drawLine(c[2],c[3],color);idraw->drawLine(c[3],c[0],color);
48	idraw->drawLine(c[4],c[5],color);idraw->drawLine(c[5],c[6],color);
49	idraw->drawLine(c[6],c[7],color);idraw->drawLine(c[7],c[4],color);
50	idraw->drawLine(c[0],c[4],color);idraw->drawLine(c[1],c[5],color);
51	idraw->drawLine(c[2],c[6],color);idraw->drawLine(c[3],c[7],color);
52	}
53
54	//
55	static void drawTree( btIDebugDraw* idraw,
56	const btDbvtNode* node,
57	int depth,
58	const btVector3& ncolor,
59	const btVector3& lcolor,
60	int mindepth,
61	int maxdepth)
62	{
63	if(node)
64	{
65	if(node->isinternal()&&((depth<maxdepth)\|\|(maxdepth<0)))
66	{
67	drawTree(idraw,node->childs[0],depth+1,ncolor,lcolor,mindepth,maxdepth);
68	drawTree(idraw,node->childs[1],depth+1,ncolor,lcolor,mindepth,maxdepth);
69	}
70	if(depth>=mindepth)
71	{
72	const btScalar scl=(btScalar)(node->isinternal()?1:1);
73	const btVector3 mi=node->volume.Center()-node->volume.Extents()*scl;
74	const btVector3 mx=node->volume.Center()+node->volume.Extents()*scl;
75	drawBox(idraw,mi,mx,node->isleaf()?lcolor:ncolor);
76	}
77	}
78	}
79
80	//
81	template <typename T>
82	static inline T sum(const btAlignedObjectArray<T>& items)
83	{
84	T v;
85	if(items.size())
86	{
87	v=items[0];
88	for(int i=1,ni=items.size();i<ni;++i)
89	{
90	v+=items[i];
91	}
92	}
93	return(v);
94	}
95
96	//
97	template <typename T,typename Q>
98	static inline void add(btAlignedObjectArray<T>& items,const Q& value)
99	{
100	for(int i=0,ni=items.size();i<ni;++i)
101	{
102	items[i]+=value;
103	}
104	}
105
106	//
107	template <typename T,typename Q>
108	static inline void mul(btAlignedObjectArray<T>& items,const Q& value)
109	{
110	for(int i=0,ni=items.size();i<ni;++i)
111	{
112	items[i]*=value;
113	}
114	}
115
116	//
117	template <typename T>
118	static inline T average(const btAlignedObjectArray<T>& items)
119	{
120	const btScalar n=(btScalar)(items.size()>0?items.size():1);
121	return(sum(items)/n);
122	}
123
124	//
125	static inline btScalar tetravolume(const btVector3& x0,
126	const btVector3& x1,
127	const btVector3& x2,
128	const btVector3& x3)
129	{
130	const btVector3 a=x1-x0;
131	const btVector3 b=x2-x0;
132	const btVector3 c=x3-x0;
133	return(dot(a,cross(b,c)));
134	}
135
136	//
137	#if 0
138	static btVector3 stresscolor(btScalar stress)
139	{
140	static const btVector3 spectrum[]= { btVector3(1,0,1),
141	btVector3(0,0,1),
142	btVector3(0,1,1),
143	btVector3(0,1,0),
144	btVector3(1,1,0),
145	btVector3(1,0,0),
146	btVector3(1,0,0)};
147	static const int ncolors=sizeof(spectrum)/sizeof(spectrum[0])-1;
148	static const btScalar one=1;
149	stress=btMax<btScalar>(0,btMin<btScalar>(1,stress))*ncolors;
150	const int sel=(int)stress;
151	const btScalar frc=stress-sel;
152	return(spectrum[sel]+(spectrum[sel+1]-spectrum[sel])*frc);
153	}
154	#endif
155
156	//
157	void btSoftBodyHelpers::Draw( btSoftBody* psb,
158	btIDebugDraw* idraw,
159	int drawflags)
160	{
161	const btScalar scl=(btScalar)0.1;
162	const btScalar nscl=scl*5;
163	const btVector3 lcolor=btVector3(0,0,0);
164	const btVector3 ncolor=btVector3(1,1,1);
165	const btVector3 ccolor=btVector3(1,0,0);
166	int i,j,nj;
167
168	/* Nodes */
169	if(0!=(drawflags&fDrawFlags::Nodes))
170	{
171	for(i=0;i<psb->m_nodes.size();++i)
172	{
173	const btSoftBody::Node& n=psb->m_nodes[i];
174	if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
175	idraw->drawLine(n.m_x-btVector3(scl,0,0),n.m_x+btVector3(scl,0,0),btVector3(1,0,0));
176	idraw->drawLine(n.m_x-btVector3(0,scl,0),n.m_x+btVector3(0,scl,0),btVector3(0,1,0));
177	idraw->drawLine(n.m_x-btVector3(0,0,scl),n.m_x+btVector3(0,0,scl),btVector3(0,0,1));
178	}
179	}
180	/* Links */
181	if(0!=(drawflags&fDrawFlags::Links))
182	{
183	for(i=0;i<psb->m_links.size();++i)
184	{
185	const btSoftBody::Link& l=psb->m_links[i];
186	if(0==(l.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
187	idraw->drawLine(l.m_n[0]->m_x,l.m_n[1]->m_x,lcolor);
188	}
189	}
190	/* Normals */
191	if(0!=(drawflags&fDrawFlags::Normals))
192	{
193	for(i=0;i<psb->m_nodes.size();++i)
194	{
195	const btSoftBody::Node& n=psb->m_nodes[i];
196	if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
197	const btVector3 d=n.m_n*nscl;
198	idraw->drawLine(n.m_x,n.m_x+d,ncolor);
199	idraw->drawLine(n.m_x,n.m_x-d,ncolor*0.5);
200	}
201	}
202	/* Contacts */
203	if(0!=(drawflags&fDrawFlags::Contacts))
204	{
205	static const btVector3 axis[]={btVector3(1,0,0),
206	btVector3(0,1,0),
207	btVector3(0,0,1)};
208	for(i=0;i<psb->m_rcontacts.size();++i)
209	{
210	const btSoftBody::RContact& c=psb->m_rcontacts[i];
211	const btVector3 o= c.m_node->m_x-c.m_cti.m_normal*
212	(dot(c.m_node->m_x,c.m_cti.m_normal)+c.m_cti.m_offset);
213	const btVector3 x=cross(c.m_cti.m_normal,axis[c.m_cti.m_normal.minAxis()]).normalized();
214	const btVector3 y=cross(x,c.m_cti.m_normal).normalized();
215	idraw->drawLine(o-xnscl,o+xnscl,ccolor);
216	idraw->drawLine(o-ynscl,o+ynscl,ccolor);
217	idraw->drawLine(o,o+c.m_cti.m_normalnscl3,btVector3(1,1,0));
218	}
219	}
220	/* Anchors */
221	if(0!=(drawflags&fDrawFlags::Anchors))
222	{
223	for(i=0;i<psb->m_anchors.size();++i)
224	{
225	const btSoftBody::Anchor& a=psb->m_anchors[i];
226	const btVector3 q=a.m_body->getWorldTransform()*a.m_local;
227	drawVertex(idraw,a.m_node->m_x,0.25,btVector3(1,0,0));
228	drawVertex(idraw,q,0.25,btVector3(0,1,0));
229	idraw->drawLine(a.m_node->m_x,q,btVector3(1,1,1));
230	}
231	for(i=0;i<psb->m_nodes.size();++i)
232	{
233	const btSoftBody::Node& n=psb->m_nodes[i];
234	if(0==(n.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
235	if(n.m_im<=0)
236	{
237	drawVertex(idraw,n.m_x,0.25,btVector3(1,0,0));
238	}
239	}
240	}
241	/* Faces */
242	if(0!=(drawflags&fDrawFlags::Faces))
243	{
244	const btScalar scl=(btScalar)0.8;
245	const btScalar alp=(btScalar)1;
246	const btVector3 col(0,(btScalar)0.7,0);
247	for(i=0;i<psb->m_faces.size();++i)
248	{
249	const btSoftBody::Face& f=psb->m_faces[i];
250	if(0==(f.m_material->m_flags&btSoftBody::fMaterial::DebugDraw)) continue;
251	const btVector3 x[]={f.m_n[0]->m_x,f.m_n[1]->m_x,f.m_n[2]->m_x};
252	const btVector3 c=(x[0]+x[1]+x[2])/3;
253	idraw->drawTriangle((x[0]-c)*scl+c,
254	(x[1]-c)*scl+c,
255	(x[2]-c)*scl+c,
256	col,alp);
257	}
258	}
259	/* Clusters */
260	if(0!=(drawflags&fDrawFlags::Clusters))
261	{
262	srand(1806);
263	for(i=0;i<psb->m_clusters.size();++i)
264	{
265	if(psb->m_clusters[i]->m_collide)
266	{
267	btVector3 color( rand()/(btScalar)RAND_MAX,
268	rand()/(btScalar)RAND_MAX,
269	rand()/(btScalar)RAND_MAX);
270	color=color.normalized()*0.75;
271	btAlignedObjectArray<btVector3> vertices;
272	vertices.resize(psb->m_clusters[i]->m_nodes.size());
273	for(j=0,nj=vertices.size();j<nj;++j)
274	{
275	vertices[j]=psb->m_clusters[i]->m_nodes[j]->m_x;
276	}
277	HullDesc hdsc(QF_TRIANGLES,vertices.size(),&vertices[0]);
278	HullResult hres;
279	HullLibrary hlib;
280	hdsc.mMaxVertices=vertices.size();
281	hlib.CreateConvexHull(hdsc,hres);
282	const btVector3 center=average(hres.m_OutputVertices);
283	add(hres.m_OutputVertices,-center);
284	mul(hres.m_OutputVertices,(btScalar)1);
285	add(hres.m_OutputVertices,center);
286	for(j=0;j<(int)hres.mNumFaces;++j)
287	{
288	const int idx[]={hres.m_Indices[j3+0],hres.m_Indices[j3+1],hres.m_Indices[j*3+2]};
289	idraw->drawTriangle(hres.m_OutputVertices[idx[0]],
290	hres.m_OutputVertices[idx[1]],
291	hres.m_OutputVertices[idx[2]],
292	color,1);
293	}
294	hlib.ReleaseResult(hres);
295	}
296	/* Velocities */
297	#if 0
298	for(int j=0;j<psb->m_clusters[i].m_nodes.size();++j)
299	{
300	const btSoftBody::Cluster& c=psb->m_clusters[i];
301	const btVector3 r=c.m_nodes[j]->m_x-c.m_com;
302	const btVector3 v=c.m_lv+cross(c.m_av,r);
303	idraw->drawLine(c.m_nodes[j]->m_x,c.m_nodes[j]->m_x+v,btVector3(1,0,0));
304	}
305	#endif
306	/* Frame */
307	btSoftBody::Cluster& c=*psb->m_clusters[i];
308	idraw->drawLine(c.m_com,c.m_framexform*btVector3(10,0,0),btVector3(1,0,0));
309	idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,10,0),btVector3(0,1,0));
310	idraw->drawLine(c.m_com,c.m_framexform*btVector3(0,0,10),btVector3(0,0,1));
311	}
312	}
313	/* Notes */
314	if(0!=(drawflags&fDrawFlags::Notes))
315	{
316	for(i=0;i<psb->m_notes.size();++i)
317	{
318	const btSoftBody::Note& n=psb->m_notes[i];
319	btVector3 p=n.m_offset;
320	for(int j=0;j<n.m_rank;++j)
321	{
322	p+=n.m_nodes[j]->m_x*n.m_coords[j];
323	}
324	idraw->draw3dText(p,n.m_text);
325	}
326	}
327	/* Node tree */
328	if(0!=(drawflags&fDrawFlags::NodeTree)) DrawNodeTree(psb,idraw);
329	/* Face tree */
330	if(0!=(drawflags&fDrawFlags::FaceTree)) DrawFaceTree(psb,idraw);
331	/* Cluster tree */
332	if(0!=(drawflags&fDrawFlags::ClusterTree)) DrawClusterTree(psb,idraw);
333	/* Joints */
334	if(0!=(drawflags&fDrawFlags::Joints))
335	{
336	for(i=0;i<psb->m_joints.size();++i)
337	{
338	const btSoftBody::Joint* pj=psb->m_joints[i];
339	switch(pj->Type())
340	{
341	case btSoftBody::Joint::eType::Linear:
342	{
343	const btSoftBody::LJoint* pjl=(const btSoftBody::LJoint*)pj;
344	const btVector3 a0=pj->m_bodies[0].xform()*pjl->m_refs[0];
345	const btVector3 a1=pj->m_bodies[1].xform()*pjl->m_refs[1];
346	idraw->drawLine(pj->m_bodies[0].xform().getOrigin(),a0,btVector3(1,1,0));
347	idraw->drawLine(pj->m_bodies[1].xform().getOrigin(),a1,btVector3(0,1,1));
348	drawVertex(idraw,a0,0.25,btVector3(1,1,0));
349	drawVertex(idraw,a1,0.25,btVector3(0,1,1));
350	}
351	break;
352	case btSoftBody::Joint::eType::Angular:
353	{
354	const btSoftBody::AJoint* pja=(const btSoftBody::AJoint*)pj;
355	const btVector3 o0=pj->m_bodies[0].xform().getOrigin();
356	const btVector3 o1=pj->m_bodies[1].xform().getOrigin();
357	const btVector3 a0=pj->m_bodies[0].xform().getBasis()*pj->m_refs[0];
358	const btVector3 a1=pj->m_bodies[1].xform().getBasis()*pj->m_refs[1];
359	idraw->drawLine(o0,o0+a0*10,btVector3(1,1,0));
360	idraw->drawLine(o0,o0+a1*10,btVector3(1,1,0));
361	idraw->drawLine(o1,o1+a0*10,btVector3(0,1,1));
362	idraw->drawLine(o1,o1+a1*10,btVector3(0,1,1));
363	}
364	}
365	}
366	}
367	}
368
369	//
370	void btSoftBodyHelpers::DrawInfos( btSoftBody* psb,
371	btIDebugDraw* idraw,
372	bool masses,
373	bool areas,
374	bool /stress/)
375	{
376	for(int i=0;i<psb->m_nodes.size();++i)
377	{
378	const btSoftBody::Node& n=psb->m_nodes[i];
379	char text[2048]={0};
380	char buff[1024];
381	if(masses)
382	{
383	sprintf(buff," M(%.2f)",1/n.m_im);
384	strcat(text,buff);
385	}
386	if(areas)
387	{
388	sprintf(buff," A(%.2f)",n.m_area);
389	strcat(text,buff);
390	}
391	if(text[0]) idraw->draw3dText(n.m_x,text);
392	}
393	}
394
395	//
396	void btSoftBodyHelpers::DrawNodeTree( btSoftBody* psb,
397	btIDebugDraw* idraw,
398	int mindepth,
399	int maxdepth)
400	{
401	drawTree(idraw,psb->m_ndbvt.m_root,0,btVector3(1,0,1),btVector3(1,1,1),mindepth,maxdepth);
402	}
403
404	//
405	void btSoftBodyHelpers::DrawFaceTree( btSoftBody* psb,
406	btIDebugDraw* idraw,
407	int mindepth,
408	int maxdepth)
409	{
410	drawTree(idraw,psb->m_fdbvt.m_root,0,btVector3(0,1,0),btVector3(1,0,0),mindepth,maxdepth);
411	}
412
413	//
414	void btSoftBodyHelpers::DrawClusterTree( btSoftBody* psb,
415	btIDebugDraw* idraw,
416	int mindepth,
417	int maxdepth)
418	{
419	drawTree(idraw,psb->m_cdbvt.m_root,0,btVector3(0,1,1),btVector3(1,0,0),mindepth,maxdepth);
420	}
421
422	//
423	void btSoftBodyHelpers::DrawFrame( btSoftBody* psb,
424	btIDebugDraw* idraw)
425	{
426	if(psb->m_pose.m_bframe)
427	{
428	static const btScalar ascl=10;
429	static const btScalar nscl=(btScalar)0.1;
430	const btVector3 com=psb->m_pose.m_com;
431	const btMatrix3x3 trs=psb->m_pose.m_rot*psb->m_pose.m_scl;
432	const btVector3 Xaxis=(trs*btVector3(1,0,0)).normalized();
433	const btVector3 Yaxis=(trs*btVector3(0,1,0)).normalized();
434	const btVector3 Zaxis=(trs*btVector3(0,0,1)).normalized();
435	idraw->drawLine(com,com+Xaxis*ascl,btVector3(1,0,0));
436	idraw->drawLine(com,com+Yaxis*ascl,btVector3(0,1,0));
437	idraw->drawLine(com,com+Zaxis*ascl,btVector3(0,0,1));
438	for(int i=0;i<psb->m_pose.m_pos.size();++i)
439	{
440	const btVector3 x=com+trs*psb->m_pose.m_pos[i];
441	drawVertex(idraw,x,nscl,btVector3(1,0,1));
442	}
443	}
444	}
445
446	//
447	btSoftBody* btSoftBodyHelpers::CreateRope( btSoftBodyWorldInfo& worldInfo, const btVector3& from,
448	const btVector3& to,
449	int res,
450	int fixeds)
451	{
452	/* Create nodes */
453	const int r=res+2;
454	btVector3* x=new btVector3[r];
455	btScalar* m=new btScalar[r];
456	int i;
457
458	for(i=0;i<r;++i)
459	{
460	const btScalar t=i/(btScalar)(r-1);
461	x[i]=lerp(from,to,t);
462	m[i]=1;
463	}
464	btSoftBody* psb= new btSoftBody(&worldInfo,r,x,m);
465	if(fixeds&1) psb->setMass(0,0);
466	if(fixeds&2) psb->setMass(r-1,0);
467	delete[] x;
468	delete[] m;
469	/* Create links */
470	for(i=1;i<r;++i)
471	{
472	psb->appendLink(i-1,i);
473	}
474	/* Finished */
475	return(psb);
476	}
477
478	//
479	btSoftBody* btSoftBodyHelpers::CreatePatch(btSoftBodyWorldInfo& worldInfo,const btVector3& corner00,
480	const btVector3& corner10,
481	const btVector3& corner01,
482	const btVector3& corner11,
483	int resx,
484	int resy,
485	int fixeds,
486	bool gendiags)
487	{
488	#define IDX(_x_,_y_) ((_y_)*rx+(_x_))
489	/* Create nodes */
490	if((resx<2)\|\|(resy<2)) return(0);
491	const int rx=resx;
492	const int ry=resy;
493	const int tot=rx*ry;
494	btVector3* x=new btVector3[tot];
495	btScalar* m=new btScalar[tot];
496	int iy;
497
498	for(iy=0;iy<ry;++iy)
499	{
500	const btScalar ty=iy/(btScalar)(ry-1);
501	const btVector3 py0=lerp(corner00,corner01,ty);
502	const btVector3 py1=lerp(corner10,corner11,ty);
503	for(int ix=0;ix<rx;++ix)
504	{
505	const btScalar tx=ix/(btScalar)(rx-1);
506	x[IDX(ix,iy)]=lerp(py0,py1,tx);
507	m[IDX(ix,iy)]=1;
508	}
509	}
510	btSoftBody* psb=new btSoftBody(&worldInfo,tot,x,m);
511	if(fixeds&1) psb->setMass(IDX(0,0),0);
512	if(fixeds&2) psb->setMass(IDX(rx-1,0),0);
513	if(fixeds&4) psb->setMass(IDX(0,ry-1),0);
514	if(fixeds&8) psb->setMass(IDX(rx-1,ry-1),0);
515	delete[] x;
516	delete[] m;
517	/* Create links and faces */
518	for(iy=0;iy<ry;++iy)
519	{
520	for(int ix=0;ix<rx;++ix)
521	{
522	const int idx=IDX(ix,iy);
523	const bool mdx=(ix+1)<rx;
524	const bool mdy=(iy+1)<ry;
525	if(mdx) psb->appendLink(idx,IDX(ix+1,iy));
526	if(mdy) psb->appendLink(idx,IDX(ix,iy+1));
527	if(mdx&&mdy)
528	{
529	if((ix+iy)&1)
530	{
531	psb->appendFace(IDX(ix,iy),IDX(ix+1,iy),IDX(ix+1,iy+1));
532	psb->appendFace(IDX(ix,iy),IDX(ix+1,iy+1),IDX(ix,iy+1));
533	if(gendiags)
534	{
535	psb->appendLink(IDX(ix,iy),IDX(ix+1,iy+1));
536	}
537	}
538	else
539	{
540	psb->appendFace(IDX(ix,iy+1),IDX(ix,iy),IDX(ix+1,iy));
541	psb->appendFace(IDX(ix,iy+1),IDX(ix+1,iy),IDX(ix+1,iy+1));
542	if(gendiags)
543	{
544	psb->appendLink(IDX(ix+1,iy),IDX(ix,iy+1));
545	}
546	}
547	}
548	}
549	}
550	/* Finished */
551	#undef IDX
552	return(psb);
553	}
554
555	//
556	btSoftBody* btSoftBodyHelpers::CreateEllipsoid(btSoftBodyWorldInfo& worldInfo,const btVector3& center,
557	const btVector3& radius,
558	int res)
559	{
560	struct Hammersley
561	{
562	static void Generate(btVector3* x,int n)
563	{
564	for(int i=0;i<n;i++)
565	{
566	btScalar p=0.5,t=0;
567	for(int j=i;j;p*=0.5,j>>=1) if(j&1) t+=p;
568	btScalar w=2*t-1;
569	btScalar a=(SIMD_PI+2iSIMD_PI)/n;
570	btScalar s=btSqrt(1-w*w);
571	x++=btVector3(sbtCos(a),s*btSin(a),w);
572	}
573	}
574	};
575	btAlignedObjectArray<btVector3> vtx;
576	vtx.resize(3+res);
577	Hammersley::Generate(&vtx[0],vtx.size());
578	for(int i=0;i<vtx.size();++i)
579	{
580	vtx[i]=vtx[i]*radius+center;
581	}
582	return(CreateFromConvexHull(worldInfo,&vtx[0],vtx.size()));
583	}
584
585
586
587	//
588	btSoftBody* btSoftBodyHelpers::CreateFromTriMesh(btSoftBodyWorldInfo& worldInfo,const btScalar* vertices,
589	const int* triangles,
590	int ntriangles)
591	{
592	int maxidx=0;
593	int i,j,ni;
594
595	for(i=0,ni=ntriangles*3;i<ni;++i)
596	{
597	maxidx=btMax(triangles[i],maxidx);
598	}
599	++maxidx;
600	btAlignedObjectArray<bool> chks;
601	btAlignedObjectArray<btVector3> vtx;
602	chks.resize(maxidx*maxidx,false);
603	vtx.resize(maxidx);
604	for(i=0,j=0,ni=maxidx*3;i<ni;++j,i+=3)
605	{
606	vtx[j]=btVector3(vertices[i],vertices[i+1],vertices[i+2]);
607	}
608	btSoftBody* psb=new btSoftBody(&worldInfo,vtx.size(),&vtx[0],0);
609	for( i=0,ni=ntriangles*3;i<ni;i+=3)
610	{
611	const int idx[]={triangles[i],triangles[i+1],triangles[i+2]};
612	#define IDX(_x_,_y_) ((_y_)*maxidx+(_x_))
613	for(int j=2,k=0;k<3;j=k++)
614	{
615	if(!chks[IDX(idx[j],idx[k])])
616	{
617	chks[IDX(idx[j],idx[k])]=true;
618	chks[IDX(idx[k],idx[k])]=true;
619	psb->appendLink(idx[j],idx[k]);
620	}
621	}
622	#undef IDX
623	psb->appendFace(idx[0],idx[1],idx[2]);
624	}
625	psb->randomizeConstraints();
626	return(psb);
627	}
628
629	//
630	btSoftBody* btSoftBodyHelpers::CreateFromConvexHull(btSoftBodyWorldInfo& worldInfo, const btVector3* vertices,
631	int nvertices)
632	{
633	HullDesc hdsc(QF_TRIANGLES,nvertices,vertices);
634	HullResult hres;
635	HullLibrary hlib;/??/
636	hdsc.mMaxVertices=nvertices;
637	hlib.CreateConvexHull(hdsc,hres);
638	btSoftBody* psb=new btSoftBody(&worldInfo,(int)hres.mNumOutputVertices,
639	&hres.m_OutputVertices[0],0);
640	for(int i=0;i<(int)hres.mNumFaces;++i)
641	{
642	const int idx[]={ hres.m_Indices[i*3+0],
643	hres.m_Indices[i*3+1],
644	hres.m_Indices[i*3+2]};
645	if(idx[0]<idx[1]) psb->appendLink( idx[0],idx[1]);
646	if(idx[1]<idx[2]) psb->appendLink( idx[1],idx[2]);
647	if(idx[2]<idx[0]) psb->appendLink( idx[2],idx[0]);
648	psb->appendFace(idx[0],idx[1],idx[2]);
649	}
650	hlib.ReleaseResult(hres);
651	psb->randomizeConstraints();
652	return(psb);
653	}

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