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Diffstat (limited to 'thirdparty/bullet/LinearMath/btConvexHull.cpp')
| -rw-r--r-- | thirdparty/bullet/LinearMath/btConvexHull.cpp | 1167 |
1 files changed, 1167 insertions, 0 deletions
diff --git a/thirdparty/bullet/LinearMath/btConvexHull.cpp b/thirdparty/bullet/LinearMath/btConvexHull.cpp new file mode 100644 index 0000000000..f8b79a1aba --- /dev/null +++ b/thirdparty/bullet/LinearMath/btConvexHull.cpp @@ -0,0 +1,1167 @@ +/* +Stan Melax Convex Hull Computation +Copyright (c) 2003-2006 Stan Melax http://www.melax.com/ + +This software is provided 'as-is', without any express or implied warranty. +In no event will the authors be held liable for any damages arising from the use of this software. +Permission is granted to anyone to use this software for any purpose, +including commercial applications, and to alter it and redistribute it freely, +subject to the following restrictions: + +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. +2. Altered source versions must be plainly marked as such, and must not be misrepresented as being the original software. +3. This notice may not be removed or altered from any source distribution. +*/ + +#include <string.h> + +#include "btConvexHull.h" +#include "btAlignedObjectArray.h" +#include "btMinMax.h" +#include "btVector3.h" + + + + + +//---------------------------------- + +class int3 +{ +public: + int x,y,z; + int3(){}; + int3(int _x,int _y, int _z){x=_x;y=_y;z=_z;} + const int& operator[](int i) const {return (&x)[i];} + int& operator[](int i) {return (&x)[i];} +}; + + +//------- btPlane ---------- + + +inline btPlane PlaneFlip(const btPlane &plane){return btPlane(-plane.normal,-plane.dist);} +inline int operator==( const btPlane &a, const btPlane &b ) { return (a.normal==b.normal && a.dist==b.dist); } +inline int coplanar( const btPlane &a, const btPlane &b ) { return (a==b || a==PlaneFlip(b)); } + + +//--------- Utility Functions ------ + +btVector3 PlaneLineIntersection(const btPlane &plane, const btVector3 &p0, const btVector3 &p1); +btVector3 PlaneProject(const btPlane &plane, const btVector3 &point); + +btVector3 ThreePlaneIntersection(const btPlane &p0,const btPlane &p1, const btPlane &p2); +btVector3 ThreePlaneIntersection(const btPlane &p0,const btPlane &p1, const btPlane &p2) +{ + btVector3 N1 = p0.normal; + btVector3 N2 = p1.normal; + btVector3 N3 = p2.normal; + + btVector3 n2n3; n2n3 = N2.cross(N3); + btVector3 n3n1; n3n1 = N3.cross(N1); + btVector3 n1n2; n1n2 = N1.cross(N2); + + btScalar quotient = (N1.dot(n2n3)); + + btAssert(btFabs(quotient) > btScalar(0.000001)); + + quotient = btScalar(-1.) / quotient; + n2n3 *= p0.dist; + n3n1 *= p1.dist; + n1n2 *= p2.dist; + btVector3 potentialVertex = n2n3; + potentialVertex += n3n1; + potentialVertex += n1n2; + potentialVertex *= quotient; + + btVector3 result(potentialVertex.getX(),potentialVertex.getY(),potentialVertex.getZ()); + return result; + +} + +btScalar DistanceBetweenLines(const btVector3 &ustart, const btVector3 &udir, const btVector3 &vstart, const btVector3 &vdir, btVector3 *upoint=NULL, btVector3 *vpoint=NULL); +btVector3 TriNormal(const btVector3 &v0, const btVector3 &v1, const btVector3 &v2); +btVector3 NormalOf(const btVector3 *vert, const int n); + + +btVector3 PlaneLineIntersection(const btPlane &plane, const btVector3 &p0, const btVector3 &p1) +{ + // returns the point where the line p0-p1 intersects the plane n&d + btVector3 dif; + dif = p1-p0; + btScalar dn= btDot(plane.normal,dif); + btScalar t = -(plane.dist+btDot(plane.normal,p0) )/dn; + return p0 + (dif*t); +} + +btVector3 PlaneProject(const btPlane &plane, const btVector3 &point) +{ + return point - plane.normal * (btDot(point,plane.normal)+plane.dist); +} + +btVector3 TriNormal(const btVector3 &v0, const btVector3 &v1, const btVector3 &v2) +{ + // return the normal of the triangle + // inscribed by v0, v1, and v2 + btVector3 cp=btCross(v1-v0,v2-v1); + btScalar m=cp.length(); + if(m==0) return btVector3(1,0,0); + return cp*(btScalar(1.0)/m); +} + + +btScalar DistanceBetweenLines(const btVector3 &ustart, const btVector3 &udir, const btVector3 &vstart, const btVector3 &vdir, btVector3 *upoint, btVector3 *vpoint) +{ + btVector3 cp; + cp = btCross(udir,vdir).normalized(); + + btScalar distu = -btDot(cp,ustart); + btScalar distv = -btDot(cp,vstart); + btScalar dist = (btScalar)fabs(distu-distv); + if(upoint) + { + btPlane plane; + plane.normal = btCross(vdir,cp).normalized(); + plane.dist = -btDot(plane.normal,vstart); + *upoint = PlaneLineIntersection(plane,ustart,ustart+udir); + } + if(vpoint) + { + btPlane plane; + plane.normal = btCross(udir,cp).normalized(); + plane.dist = -btDot(plane.normal,ustart); + *vpoint = PlaneLineIntersection(plane,vstart,vstart+vdir); + } + return dist; +} + + + + + + + +#define COPLANAR (0) +#define UNDER (1) +#define OVER (2) +#define SPLIT (OVER|UNDER) +#define PAPERWIDTH (btScalar(0.001)) + +btScalar planetestepsilon = PAPERWIDTH; + + + +typedef ConvexH::HalfEdge HalfEdge; + +ConvexH::ConvexH(int vertices_size,int edges_size,int facets_size) +{ + vertices.resize(vertices_size); + edges.resize(edges_size); + facets.resize(facets_size); +} + + +int PlaneTest(const btPlane &p, const btVector3 &v); +int PlaneTest(const btPlane &p, const btVector3 &v) { + btScalar a = btDot(v,p.normal)+p.dist; + int flag = (a>planetestepsilon)?OVER:((a<-planetestepsilon)?UNDER:COPLANAR); + return flag; +} + +int SplitTest(ConvexH &convex,const btPlane &plane); +int SplitTest(ConvexH &convex,const btPlane &plane) { + int flag=0; + for(int i=0;i<convex.vertices.size();i++) { + flag |= PlaneTest(plane,convex.vertices[i]); + } + return flag; +} + +class VertFlag +{ +public: + unsigned char planetest; + unsigned char junk; + unsigned char undermap; + unsigned char overmap; +}; +class EdgeFlag +{ +public: + unsigned char planetest; + unsigned char fixes; + short undermap; + short overmap; +}; +class PlaneFlag +{ +public: + unsigned char undermap; + unsigned char overmap; +}; +class Coplanar{ +public: + unsigned short ea; + unsigned char v0; + unsigned char v1; +}; + + + + + + + + +template<class T> +int maxdirfiltered(const T *p,int count,const T &dir,btAlignedObjectArray<int> &allow) +{ + btAssert(count); + int m=-1; + for(int i=0;i<count;i++) + if(allow[i]) + { + if(m==-1 || btDot(p[i],dir)>btDot(p[m],dir)) + m=i; + } + btAssert(m!=-1); + return m; +} + +btVector3 orth(const btVector3 &v); +btVector3 orth(const btVector3 &v) +{ + btVector3 a=btCross(v,btVector3(0,0,1)); + btVector3 b=btCross(v,btVector3(0,1,0)); + if (a.length() > b.length()) + { + return a.normalized(); + } else { + return b.normalized(); + } +} + + +template<class T> +int maxdirsterid(const T *p,int count,const T &dir,btAlignedObjectArray<int> &allow) +{ + int m=-1; + while(m==-1) + { + m = maxdirfiltered(p,count,dir,allow); + if(allow[m]==3) return m; + T u = orth(dir); + T v = btCross(u,dir); + int ma=-1; + for(btScalar x = btScalar(0.0) ; x<= btScalar(360.0) ; x+= btScalar(45.0)) + { + btScalar s = btSin(SIMD_RADS_PER_DEG*(x)); + btScalar c = btCos(SIMD_RADS_PER_DEG*(x)); + int mb = maxdirfiltered(p,count,dir+(u*s+v*c)*btScalar(0.025),allow); + if(ma==m && mb==m) + { + allow[m]=3; + return m; + } + if(ma!=-1 && ma!=mb) // Yuck - this is really ugly + { + int mc = ma; + for(btScalar xx = x-btScalar(40.0) ; xx <= x ; xx+= btScalar(5.0)) + { + btScalar s = btSin(SIMD_RADS_PER_DEG*(xx)); + btScalar c = btCos(SIMD_RADS_PER_DEG*(xx)); + int md = maxdirfiltered(p,count,dir+(u*s+v*c)*btScalar(0.025),allow); + if(mc==m && md==m) + { + allow[m]=3; + return m; + } + mc=md; + } + } + ma=mb; + } + allow[m]=0; + m=-1; + } + btAssert(0); + return m; +} + + + + +int operator ==(const int3 &a,const int3 &b); +int operator ==(const int3 &a,const int3 &b) +{ + for(int i=0;i<3;i++) + { + if(a[i]!=b[i]) return 0; + } + return 1; +} + + +int above(btVector3* vertices,const int3& t, const btVector3 &p, btScalar epsilon); +int above(btVector3* vertices,const int3& t, const btVector3 &p, btScalar epsilon) +{ + btVector3 n=TriNormal(vertices[t[0]],vertices[t[1]],vertices[t[2]]); + return (btDot(n,p-vertices[t[0]]) > epsilon); // EPSILON??? +} +int hasedge(const int3 &t, int a,int b); +int hasedge(const int3 &t, int a,int b) +{ + for(int i=0;i<3;i++) + { + int i1= (i+1)%3; + if(t[i]==a && t[i1]==b) return 1; + } + return 0; +} +int hasvert(const int3 &t, int v); +int hasvert(const int3 &t, int v) +{ + return (t[0]==v || t[1]==v || t[2]==v) ; +} +int shareedge(const int3 &a,const int3 &b); +int shareedge(const int3 &a,const int3 &b) +{ + int i; + for(i=0;i<3;i++) + { + int i1= (i+1)%3; + if(hasedge(a,b[i1],b[i])) return 1; + } + return 0; +} + +class btHullTriangle; + + + +class btHullTriangle : public int3 +{ +public: + int3 n; + int id; + int vmax; + btScalar rise; + btHullTriangle(int a,int b,int c):int3(a,b,c),n(-1,-1,-1) + { + vmax=-1; + rise = btScalar(0.0); + } + ~btHullTriangle() + { + } + int &neib(int a,int b); +}; + + +int &btHullTriangle::neib(int a,int b) +{ + static int er=-1; + int i; + for(i=0;i<3;i++) + { + int i1=(i+1)%3; + int i2=(i+2)%3; + if((*this)[i]==a && (*this)[i1]==b) return n[i2]; + if((*this)[i]==b && (*this)[i1]==a) return n[i2]; + } + btAssert(0); + return er; +} +void HullLibrary::b2bfix(btHullTriangle* s,btHullTriangle*t) +{ + int i; + for(i=0;i<3;i++) + { + int i1=(i+1)%3; + int i2=(i+2)%3; + int a = (*s)[i1]; + int b = (*s)[i2]; + btAssert(m_tris[s->neib(a,b)]->neib(b,a) == s->id); + btAssert(m_tris[t->neib(a,b)]->neib(b,a) == t->id); + m_tris[s->neib(a,b)]->neib(b,a) = t->neib(b,a); + m_tris[t->neib(b,a)]->neib(a,b) = s->neib(a,b); + } +} + +void HullLibrary::removeb2b(btHullTriangle* s,btHullTriangle*t) +{ + b2bfix(s,t); + deAllocateTriangle(s); + + deAllocateTriangle(t); +} + +void HullLibrary::checkit(btHullTriangle *t) +{ + (void)t; + + int i; + btAssert(m_tris[t->id]==t); + for(i=0;i<3;i++) + { + int i1=(i+1)%3; + int i2=(i+2)%3; + int a = (*t)[i1]; + int b = (*t)[i2]; + + // release compile fix + (void)i1; + (void)i2; + (void)a; + (void)b; + + btAssert(a!=b); + btAssert( m_tris[t->n[i]]->neib(b,a) == t->id); + } +} + +btHullTriangle* HullLibrary::allocateTriangle(int a,int b,int c) +{ + void* mem = btAlignedAlloc(sizeof(btHullTriangle),16); + btHullTriangle* tr = new (mem)btHullTriangle(a,b,c); + tr->id = m_tris.size(); + m_tris.push_back(tr); + + return tr; +} + +void HullLibrary::deAllocateTriangle(btHullTriangle* tri) +{ + btAssert(m_tris[tri->id]==tri); + m_tris[tri->id]=NULL; + tri->~btHullTriangle(); + btAlignedFree(tri); +} + + +void HullLibrary::extrude(btHullTriangle *t0,int v) +{ + int3 t= *t0; + int n = m_tris.size(); + btHullTriangle* ta = allocateTriangle(v,t[1],t[2]); + ta->n = int3(t0->n[0],n+1,n+2); + m_tris[t0->n[0]]->neib(t[1],t[2]) = n+0; + btHullTriangle* tb = allocateTriangle(v,t[2],t[0]); + tb->n = int3(t0->n[1],n+2,n+0); + m_tris[t0->n[1]]->neib(t[2],t[0]) = n+1; + btHullTriangle* tc = allocateTriangle(v,t[0],t[1]); + tc->n = int3(t0->n[2],n+0,n+1); + m_tris[t0->n[2]]->neib(t[0],t[1]) = n+2; + checkit(ta); + checkit(tb); + checkit(tc); + if(hasvert(*m_tris[ta->n[0]],v)) removeb2b(ta,m_tris[ta->n[0]]); + if(hasvert(*m_tris[tb->n[0]],v)) removeb2b(tb,m_tris[tb->n[0]]); + if(hasvert(*m_tris[tc->n[0]],v)) removeb2b(tc,m_tris[tc->n[0]]); + deAllocateTriangle(t0); + +} + +btHullTriangle* HullLibrary::extrudable(btScalar epsilon) +{ + int i; + btHullTriangle *t=NULL; + for(i=0;i<m_tris.size();i++) + { + if(!t || (m_tris[i] && t->rise<m_tris[i]->rise)) + { + t = m_tris[i]; + } + } + return (t->rise >epsilon)?t:NULL ; +} + + + + +int4 HullLibrary::FindSimplex(btVector3 *verts,int verts_count,btAlignedObjectArray<int> &allow) +{ + btVector3 basis[3]; + basis[0] = btVector3( btScalar(0.01), btScalar(0.02), btScalar(1.0) ); + int p0 = maxdirsterid(verts,verts_count, basis[0],allow); + int p1 = maxdirsterid(verts,verts_count,-basis[0],allow); + basis[0] = verts[p0]-verts[p1]; + if(p0==p1 || basis[0]==btVector3(0,0,0)) + return int4(-1,-1,-1,-1); + basis[1] = btCross(btVector3( btScalar(1),btScalar(0.02), btScalar(0)),basis[0]); + basis[2] = btCross(btVector3(btScalar(-0.02), btScalar(1), btScalar(0)),basis[0]); + if (basis[1].length() > basis[2].length()) + { + basis[1].normalize(); + } else { + basis[1] = basis[2]; + basis[1].normalize (); + } + int p2 = maxdirsterid(verts,verts_count,basis[1],allow); + if(p2 == p0 || p2 == p1) + { + p2 = maxdirsterid(verts,verts_count,-basis[1],allow); + } + if(p2 == p0 || p2 == p1) + return int4(-1,-1,-1,-1); + basis[1] = verts[p2] - verts[p0]; + basis[2] = btCross(basis[1],basis[0]).normalized(); + int p3 = maxdirsterid(verts,verts_count,basis[2],allow); + if(p3==p0||p3==p1||p3==p2) p3 = maxdirsterid(verts,verts_count,-basis[2],allow); + if(p3==p0||p3==p1||p3==p2) + return int4(-1,-1,-1,-1); + btAssert(!(p0==p1||p0==p2||p0==p3||p1==p2||p1==p3||p2==p3)); + if(btDot(verts[p3]-verts[p0],btCross(verts[p1]-verts[p0],verts[p2]-verts[p0])) <0) {btSwap(p2,p3);} + return int4(p0,p1,p2,p3); +} + +int HullLibrary::calchullgen(btVector3 *verts,int verts_count, int vlimit) +{ + if(verts_count <4) return 0; + if(vlimit==0) vlimit=1000000000; + int j; + btVector3 bmin(*verts),bmax(*verts); + btAlignedObjectArray<int> isextreme; + isextreme.reserve(verts_count); + btAlignedObjectArray<int> allow; + allow.reserve(verts_count); + + for(j=0;j<verts_count;j++) + { + allow.push_back(1); + isextreme.push_back(0); + bmin.setMin (verts[j]); + bmax.setMax (verts[j]); + } + btScalar epsilon = (bmax-bmin).length() * btScalar(0.001); + btAssert (epsilon != 0.0); + + + int4 p = FindSimplex(verts,verts_count,allow); + if(p.x==-1) return 0; // simplex failed + + + + btVector3 center = (verts[p[0]]+verts[p[1]]+verts[p[2]]+verts[p[3]]) / btScalar(4.0); // a valid interior point + btHullTriangle *t0 = allocateTriangle(p[2],p[3],p[1]); t0->n=int3(2,3,1); + btHullTriangle *t1 = allocateTriangle(p[3],p[2],p[0]); t1->n=int3(3,2,0); + btHullTriangle *t2 = allocateTriangle(p[0],p[1],p[3]); t2->n=int3(0,1,3); + btHullTriangle *t3 = allocateTriangle(p[1],p[0],p[2]); t3->n=int3(1,0,2); + isextreme[p[0]]=isextreme[p[1]]=isextreme[p[2]]=isextreme[p[3]]=1; + checkit(t0);checkit(t1);checkit(t2);checkit(t3); + + for(j=0;j<m_tris.size();j++) + { + btHullTriangle *t=m_tris[j]; + btAssert(t); + btAssert(t->vmax<0); + btVector3 n=TriNormal(verts[(*t)[0]],verts[(*t)[1]],verts[(*t)[2]]); + t->vmax = maxdirsterid(verts,verts_count,n,allow); + t->rise = btDot(n,verts[t->vmax]-verts[(*t)[0]]); + } + btHullTriangle *te; + vlimit-=4; + while(vlimit >0 && ((te=extrudable(epsilon)) != 0)) + { + //int3 ti=*te; + int v=te->vmax; + btAssert(v != -1); + btAssert(!isextreme[v]); // wtf we've already done this vertex + isextreme[v]=1; + //if(v==p0 || v==p1 || v==p2 || v==p3) continue; // done these already + j=m_tris.size(); + while(j--) { + if(!m_tris[j]) continue; + int3 t=*m_tris[j]; + if(above(verts,t,verts[v],btScalar(0.01)*epsilon)) + { + extrude(m_tris[j],v); + } + } + // now check for those degenerate cases where we have a flipped triangle or a really skinny triangle + j=m_tris.size(); + while(j--) + { + if(!m_tris[j]) continue; + if(!hasvert(*m_tris[j],v)) break; + int3 nt=*m_tris[j]; + if(above(verts,nt,center,btScalar(0.01)*epsilon) || btCross(verts[nt[1]]-verts[nt[0]],verts[nt[2]]-verts[nt[1]]).length()< epsilon*epsilon*btScalar(0.1) ) + { + btHullTriangle *nb = m_tris[m_tris[j]->n[0]]; + btAssert(nb);btAssert(!hasvert(*nb,v));btAssert(nb->id<j); + extrude(nb,v); + j=m_tris.size(); + } + } + j=m_tris.size(); + while(j--) + { + btHullTriangle *t=m_tris[j]; + if(!t) continue; + if(t->vmax>=0) break; + btVector3 n=TriNormal(verts[(*t)[0]],verts[(*t)[1]],verts[(*t)[2]]); + t->vmax = maxdirsterid(verts,verts_count,n,allow); + if(isextreme[t->vmax]) + { + t->vmax=-1; // already done that vertex - algorithm needs to be able to terminate. + } + else + { + t->rise = btDot(n,verts[t->vmax]-verts[(*t)[0]]); + } + } + vlimit --; + } + return 1; +} + +int HullLibrary::calchull(btVector3 *verts,int verts_count, TUIntArray& tris_out, int &tris_count,int vlimit) +{ + int rc=calchullgen(verts,verts_count, vlimit) ; + if(!rc) return 0; + btAlignedObjectArray<int> ts; + int i; + + for(i=0;i<m_tris.size();i++) + { + if(m_tris[i]) + { + for(int j=0;j<3;j++) + ts.push_back((*m_tris[i])[j]); + deAllocateTriangle(m_tris[i]); + } + } + tris_count = ts.size()/3; + tris_out.resize(ts.size()); + + for (i=0;i<ts.size();i++) + { + tris_out[i] = static_cast<unsigned int>(ts[i]); + } + m_tris.resize(0); + + return 1; +} + + + + + +bool HullLibrary::ComputeHull(unsigned int vcount,const btVector3 *vertices,PHullResult &result,unsigned int vlimit) +{ + + int tris_count; + int ret = calchull( (btVector3 *) vertices, (int) vcount, result.m_Indices, tris_count, static_cast<int>(vlimit) ); + if(!ret) return false; + result.mIndexCount = (unsigned int) (tris_count*3); + result.mFaceCount = (unsigned int) tris_count; + result.mVertices = (btVector3*) vertices; + result.mVcount = (unsigned int) vcount; + return true; + +} + + +void ReleaseHull(PHullResult &result); +void ReleaseHull(PHullResult &result) +{ + if ( result.m_Indices.size() ) + { + result.m_Indices.clear(); + } + + result.mVcount = 0; + result.mIndexCount = 0; + result.mVertices = 0; +} + + +//********************************************************************* +//********************************************************************* +//******** HullLib header +//********************************************************************* +//********************************************************************* + +//********************************************************************* +//********************************************************************* +//******** HullLib implementation +//********************************************************************* +//********************************************************************* + +HullError HullLibrary::CreateConvexHull(const HullDesc &desc, // describes the input request + HullResult &result) // contains the resulst +{ + HullError ret = QE_FAIL; + + + PHullResult hr; + + unsigned int vcount = desc.mVcount; + if ( vcount < 8 ) vcount = 8; + + btAlignedObjectArray<btVector3> vertexSource; + vertexSource.resize(static_cast<int>(vcount)); + + btVector3 scale; + + unsigned int ovcount; + + bool ok = CleanupVertices(desc.mVcount,desc.mVertices, desc.mVertexStride, ovcount, &vertexSource[0], desc.mNormalEpsilon, scale ); // normalize point cloud, remove duplicates! + + if ( ok ) + { + + +// if ( 1 ) // scale vertices back to their original size. + { + for (unsigned int i=0; i<ovcount; i++) + { + btVector3& v = vertexSource[static_cast<int>(i)]; + v[0]*=scale[0]; + v[1]*=scale[1]; + v[2]*=scale[2]; + } + } + + ok = ComputeHull(ovcount,&vertexSource[0],hr,desc.mMaxVertices); + + if ( ok ) + { + + // re-index triangle mesh so it refers to only used vertices, rebuild a new vertex table. + btAlignedObjectArray<btVector3> vertexScratch; + vertexScratch.resize(static_cast<int>(hr.mVcount)); + + BringOutYourDead(hr.mVertices,hr.mVcount, &vertexScratch[0], ovcount, &hr.m_Indices[0], hr.mIndexCount ); + + ret = QE_OK; + + if ( desc.HasHullFlag(QF_TRIANGLES) ) // if he wants the results as triangle! + { + result.mPolygons = false; + result.mNumOutputVertices = ovcount; + result.m_OutputVertices.resize(static_cast<int>(ovcount)); + result.mNumFaces = hr.mFaceCount; + result.mNumIndices = hr.mIndexCount; + + result.m_Indices.resize(static_cast<int>(hr.mIndexCount)); + + memcpy(&result.m_OutputVertices[0], &vertexScratch[0], sizeof(btVector3)*ovcount ); + + if ( desc.HasHullFlag(QF_REVERSE_ORDER) ) + { + + const unsigned int *source = &hr.m_Indices[0]; + unsigned int *dest = &result.m_Indices[0]; + + for (unsigned int i=0; i<hr.mFaceCount; i++) + { + dest[0] = source[2]; + dest[1] = source[1]; + dest[2] = source[0]; + dest+=3; + source+=3; + } + + } + else + { + memcpy(&result.m_Indices[0], &hr.m_Indices[0], sizeof(unsigned int)*hr.mIndexCount); + } + } + else + { + result.mPolygons = true; + result.mNumOutputVertices = ovcount; + result.m_OutputVertices.resize(static_cast<int>(ovcount)); + result.mNumFaces = hr.mFaceCount; + result.mNumIndices = hr.mIndexCount+hr.mFaceCount; + result.m_Indices.resize(static_cast<int>(result.mNumIndices)); + memcpy(&result.m_OutputVertices[0], &vertexScratch[0], sizeof(btVector3)*ovcount ); + +// if ( 1 ) + { + const unsigned int *source = &hr.m_Indices[0]; + unsigned int *dest = &result.m_Indices[0]; + for (unsigned int i=0; i<hr.mFaceCount; i++) + { + dest[0] = 3; + if ( desc.HasHullFlag(QF_REVERSE_ORDER) ) + { + dest[1] = source[2]; + dest[2] = source[1]; + dest[3] = source[0]; + } + else + { + dest[1] = source[0]; + dest[2] = source[1]; + dest[3] = source[2]; + } + + dest+=4; + source+=3; + } + } + } + ReleaseHull(hr); + } + } + + return ret; +} + + + +HullError HullLibrary::ReleaseResult(HullResult &result) // release memory allocated for this result, we are done with it. +{ + if ( result.m_OutputVertices.size()) + { + result.mNumOutputVertices=0; + result.m_OutputVertices.clear(); + } + if ( result.m_Indices.size() ) + { + result.mNumIndices=0; + result.m_Indices.clear(); + } + return QE_OK; +} + + +static void addPoint(unsigned int &vcount,btVector3 *p,btScalar x,btScalar y,btScalar z) +{ + // XXX, might be broken + btVector3& dest = p[vcount]; + dest[0] = x; + dest[1] = y; + dest[2] = z; + vcount++; +} + +btScalar GetDist(btScalar px,btScalar py,btScalar pz,const btScalar *p2); +btScalar GetDist(btScalar px,btScalar py,btScalar pz,const btScalar *p2) +{ + + btScalar dx = px - p2[0]; + btScalar dy = py - p2[1]; + btScalar dz = pz - p2[2]; + + return dx*dx+dy*dy+dz*dz; +} + + + +bool HullLibrary::CleanupVertices(unsigned int svcount, + const btVector3 *svertices, + unsigned int stride, + unsigned int &vcount, // output number of vertices + btVector3 *vertices, // location to store the results. + btScalar normalepsilon, + btVector3& scale) +{ + if ( svcount == 0 ) return false; + + m_vertexIndexMapping.resize(0); + + +#define EPSILON btScalar(0.000001) /* close enough to consider two btScalaring point numbers to be 'the same'. */ + + vcount = 0; + + btScalar recip[3]={0.f,0.f,0.f}; + + if ( scale ) + { + scale[0] = 1; + scale[1] = 1; + scale[2] = 1; + } + + btScalar bmin[3] = { FLT_MAX, FLT_MAX, FLT_MAX }; + btScalar bmax[3] = { -FLT_MAX, -FLT_MAX, -FLT_MAX }; + + const char *vtx = (const char *) svertices; + +// if ( 1 ) + { + for (unsigned int i=0; i<svcount; i++) + { + const btScalar *p = (const btScalar *) vtx; + + vtx+=stride; + + for (int j=0; j<3; j++) + { + if ( p[j] < bmin[j] ) bmin[j] = p[j]; + if ( p[j] > bmax[j] ) bmax[j] = p[j]; + } + } + } + + btScalar dx = bmax[0] - bmin[0]; + btScalar dy = bmax[1] - bmin[1]; + btScalar dz = bmax[2] - bmin[2]; + + btVector3 center; + + center[0] = dx*btScalar(0.5) + bmin[0]; + center[1] = dy*btScalar(0.5) + bmin[1]; + center[2] = dz*btScalar(0.5) + bmin[2]; + + if ( dx < EPSILON || dy < EPSILON || dz < EPSILON || svcount < 3 ) + { + + btScalar len = FLT_MAX; + + if ( dx > EPSILON && dx < len ) len = dx; + if ( dy > EPSILON && dy < len ) len = dy; + if ( dz > EPSILON && dz < len ) len = dz; + + if ( len == FLT_MAX ) + { + dx = dy = dz = btScalar(0.01); // one centimeter + } + else + { + if ( dx < EPSILON ) dx = len * btScalar(0.05); // 1/5th the shortest non-zero edge. + if ( dy < EPSILON ) dy = len * btScalar(0.05); + if ( dz < EPSILON ) dz = len * btScalar(0.05); + } + + btScalar x1 = center[0] - dx; + btScalar x2 = center[0] + dx; + + btScalar y1 = center[1] - dy; + btScalar y2 = center[1] + dy; + + btScalar z1 = center[2] - dz; + btScalar z2 = center[2] + dz; + + addPoint(vcount,vertices,x1,y1,z1); + addPoint(vcount,vertices,x2,y1,z1); + addPoint(vcount,vertices,x2,y2,z1); + addPoint(vcount,vertices,x1,y2,z1); + addPoint(vcount,vertices,x1,y1,z2); + addPoint(vcount,vertices,x2,y1,z2); + addPoint(vcount,vertices,x2,y2,z2); + addPoint(vcount,vertices,x1,y2,z2); + + return true; // return cube + + + } + else + { + if ( scale ) + { + scale[0] = dx; + scale[1] = dy; + scale[2] = dz; + + recip[0] = 1 / dx; + recip[1] = 1 / dy; + recip[2] = 1 / dz; + + center[0]*=recip[0]; + center[1]*=recip[1]; + center[2]*=recip[2]; + + } + + } + + + + vtx = (const char *) svertices; + + for (unsigned int i=0; i<svcount; i++) + { + const btVector3 *p = (const btVector3 *)vtx; + vtx+=stride; + + btScalar px = p->getX(); + btScalar py = p->getY(); + btScalar pz = p->getZ(); + + if ( scale ) + { + px = px*recip[0]; // normalize + py = py*recip[1]; // normalize + pz = pz*recip[2]; // normalize + } + +// if ( 1 ) + { + unsigned int j; + + for (j=0; j<vcount; j++) + { + /// XXX might be broken + btVector3& v = vertices[j]; + + btScalar x = v[0]; + btScalar y = v[1]; + btScalar z = v[2]; + + btScalar dx = btFabs(x - px ); + btScalar dy = btFabs(y - py ); + btScalar dz = btFabs(z - pz ); + + if ( dx < normalepsilon && dy < normalepsilon && dz < normalepsilon ) + { + // ok, it is close enough to the old one + // now let us see if it is further from the center of the point cloud than the one we already recorded. + // in which case we keep this one instead. + + btScalar dist1 = GetDist(px,py,pz,center); + btScalar dist2 = GetDist(v[0],v[1],v[2],center); + + if ( dist1 > dist2 ) + { + v[0] = px; + v[1] = py; + v[2] = pz; + + } + + break; + } + } + + if ( j == vcount ) + { + btVector3& dest = vertices[vcount]; + dest[0] = px; + dest[1] = py; + dest[2] = pz; + vcount++; + } + m_vertexIndexMapping.push_back(j); + } + } + + // ok..now make sure we didn't prune so many vertices it is now invalid. +// if ( 1 ) + { + btScalar bmin[3] = { FLT_MAX, FLT_MAX, FLT_MAX }; + btScalar bmax[3] = { -FLT_MAX, -FLT_MAX, -FLT_MAX }; + + for (unsigned int i=0; i<vcount; i++) + { + const btVector3& p = vertices[i]; + for (int j=0; j<3; j++) + { + if ( p[j] < bmin[j] ) bmin[j] = p[j]; + if ( p[j] > bmax[j] ) bmax[j] = p[j]; + } + } + + btScalar dx = bmax[0] - bmin[0]; + btScalar dy = bmax[1] - bmin[1]; + btScalar dz = bmax[2] - bmin[2]; + + if ( dx < EPSILON || dy < EPSILON || dz < EPSILON || vcount < 3) + { + btScalar cx = dx*btScalar(0.5) + bmin[0]; + btScalar cy = dy*btScalar(0.5) + bmin[1]; + btScalar cz = dz*btScalar(0.5) + bmin[2]; + + btScalar len = FLT_MAX; + + if ( dx >= EPSILON && dx < len ) len = dx; + if ( dy >= EPSILON && dy < len ) len = dy; + if ( dz >= EPSILON && dz < len ) len = dz; + + if ( len == FLT_MAX ) + { + dx = dy = dz = btScalar(0.01); // one centimeter + } + else + { + if ( dx < EPSILON ) dx = len * btScalar(0.05); // 1/5th the shortest non-zero edge. + if ( dy < EPSILON ) dy = len * btScalar(0.05); + if ( dz < EPSILON ) dz = len * btScalar(0.05); + } + + btScalar x1 = cx - dx; + btScalar x2 = cx + dx; + + btScalar y1 = cy - dy; + btScalar y2 = cy + dy; + + btScalar z1 = cz - dz; + btScalar z2 = cz + dz; + + vcount = 0; // add box + + addPoint(vcount,vertices,x1,y1,z1); + addPoint(vcount,vertices,x2,y1,z1); + addPoint(vcount,vertices,x2,y2,z1); + addPoint(vcount,vertices,x1,y2,z1); + addPoint(vcount,vertices,x1,y1,z2); + addPoint(vcount,vertices,x2,y1,z2); + addPoint(vcount,vertices,x2,y2,z2); + addPoint(vcount,vertices,x1,y2,z2); + + return true; + } + } + + return true; +} + +void HullLibrary::BringOutYourDead(const btVector3* verts,unsigned int vcount, btVector3* overts,unsigned int &ocount,unsigned int *indices,unsigned indexcount) +{ + btAlignedObjectArray<int>tmpIndices; + tmpIndices.resize(m_vertexIndexMapping.size()); + int i; + + for (i=0;i<m_vertexIndexMapping.size();i++) + { + tmpIndices[i] = m_vertexIndexMapping[i]; + } + + TUIntArray usedIndices; + usedIndices.resize(static_cast<int>(vcount)); + memset(&usedIndices[0],0,sizeof(unsigned int)*vcount); + + ocount = 0; + + for (i=0; i<int (indexcount); i++) + { + unsigned int v = indices[i]; // original array index + + btAssert( v >= 0 && v < vcount ); + + if ( usedIndices[static_cast<int>(v)] ) // if already remapped + { + indices[i] = usedIndices[static_cast<int>(v)]-1; // index to new array + } + else + { + + indices[i] = ocount; // new index mapping + + overts[ocount][0] = verts[v][0]; // copy old vert to new vert array + overts[ocount][1] = verts[v][1]; + overts[ocount][2] = verts[v][2]; + + for (int k=0;k<m_vertexIndexMapping.size();k++) + { + if (tmpIndices[k]==int(v)) + m_vertexIndexMapping[k]=ocount; + } + + ocount++; // increment output vert count + + btAssert( ocount >=0 && ocount <= vcount ); + + usedIndices[static_cast<int>(v)] = ocount; // assign new index remapping + + + } + } + + +} |