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Diffstat (limited to 'extern/bullet2/src/LinearMath/btConvexHull.h')
| -rw-r--r-- | extern/bullet2/src/LinearMath/btConvexHull.h | 242 |
1 files changed, 242 insertions, 0 deletions
diff --git a/extern/bullet2/src/LinearMath/btConvexHull.h b/extern/bullet2/src/LinearMath/btConvexHull.h new file mode 100644 index 00000000000..8bb80de0225 --- /dev/null +++ b/extern/bullet2/src/LinearMath/btConvexHull.h @@ -0,0 +1,242 @@ + +/* +Stan Melax Convex Hull Computation +Copyright (c) 2008 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. +*/ + +///includes modifications/improvements by John Ratcliff, see BringOutYourDead below. + +#ifndef CD_HULL_H +#define CD_HULL_H + +#include "LinearMath/btVector3.h" +#include "LinearMath/btAlignedObjectArray.h" + +typedef btAlignedObjectArray<unsigned int> TUIntArray; + +class HullResult +{ +public: + HullResult(void) + { + mPolygons = true; + mNumOutputVertices = 0; + mNumFaces = 0; + mNumIndices = 0; + } + bool mPolygons; // true if indices represents polygons, false indices are triangles + unsigned int mNumOutputVertices; // number of vertices in the output hull + btAlignedObjectArray<btVector3> m_OutputVertices; // array of vertices + unsigned int mNumFaces; // the number of faces produced + unsigned int mNumIndices; // the total number of indices + btAlignedObjectArray<unsigned int> m_Indices; // pointer to indices. + +// If triangles, then indices are array indexes into the vertex list. +// If polygons, indices are in the form (number of points in face) (p1, p2, p3, ..) etc.. +}; + +enum HullFlag +{ + QF_TRIANGLES = (1<<0), // report results as triangles, not polygons. + QF_REVERSE_ORDER = (1<<1), // reverse order of the triangle indices. + QF_DEFAULT = QF_TRIANGLES +}; + + +class HullDesc +{ +public: + HullDesc(void) + { + mFlags = QF_DEFAULT; + mVcount = 0; + mVertices = 0; + mVertexStride = sizeof(btVector3); + mNormalEpsilon = 0.001f; + mMaxVertices = 4096; // maximum number of points to be considered for a convex hull. + mMaxFaces = 4096; + }; + + HullDesc(HullFlag flag, + unsigned int vcount, + const btVector3 *vertices, + unsigned int stride = sizeof(btVector3)) + { + mFlags = flag; + mVcount = vcount; + mVertices = vertices; + mVertexStride = stride; + mNormalEpsilon = btScalar(0.001); + mMaxVertices = 4096; + } + + bool HasHullFlag(HullFlag flag) const + { + if ( mFlags & flag ) return true; + return false; + } + + void SetHullFlag(HullFlag flag) + { + mFlags|=flag; + } + + void ClearHullFlag(HullFlag flag) + { + mFlags&=~flag; + } + + unsigned int mFlags; // flags to use when generating the convex hull. + unsigned int mVcount; // number of vertices in the input point cloud + const btVector3 *mVertices; // the array of vertices. + unsigned int mVertexStride; // the stride of each vertex, in bytes. + btScalar mNormalEpsilon; // the epsilon for removing duplicates. This is a normalized value, if normalized bit is on. + unsigned int mMaxVertices; // maximum number of vertices to be considered for the hull! + unsigned int mMaxFaces; +}; + +enum HullError +{ + QE_OK, // success! + QE_FAIL // failed. +}; + +class btPlane +{ + public: + btVector3 normal; + btScalar dist; // distance below origin - the D from plane equasion Ax+By+Cz+D=0 + btPlane(const btVector3 &n,btScalar d):normal(n),dist(d){} + btPlane():normal(),dist(0){} + +}; + + + +class ConvexH +{ + public: + class HalfEdge + { + public: + short ea; // the other half of the edge (index into edges list) + unsigned char v; // the vertex at the start of this edge (index into vertices list) + unsigned char p; // the facet on which this edge lies (index into facets list) + HalfEdge(){} + HalfEdge(short _ea,unsigned char _v, unsigned char _p):ea(_ea),v(_v),p(_p){} + }; + ConvexH() + { + int i; + i=0; + } + ~ConvexH() + { + int i; + i=0; + } + btAlignedObjectArray<btVector3> vertices; + btAlignedObjectArray<HalfEdge> edges; + btAlignedObjectArray<btPlane> facets; + ConvexH(int vertices_size,int edges_size,int facets_size); +}; + + +class int4 +{ +public: + int x,y,z,w; + int4(){}; + int4(int _x,int _y, int _z,int _w){x=_x;y=_y;z=_z;w=_w;} + const int& operator[](int i) const {return (&x)[i];} + int& operator[](int i) {return (&x)[i];} +}; + +class PHullResult +{ +public: + + PHullResult(void) + { + mVcount = 0; + mIndexCount = 0; + mFaceCount = 0; + mVertices = 0; + } + + unsigned int mVcount; + unsigned int mIndexCount; + unsigned int mFaceCount; + btVector3* mVertices; + TUIntArray m_Indices; +}; + + + +///The HullLibrary class can create a convex hull from a collection of vertices, using the ComputeHull method. +///The btShapeHull class uses this HullLibrary to create a approximate convex mesh given a general (non-polyhedral) convex shape. +class HullLibrary +{ + + btAlignedObjectArray<class Tri*> m_tris; + +public: + + HullError CreateConvexHull(const HullDesc& desc, // describes the input request + HullResult& result); // contains the resulst + HullError ReleaseResult(HullResult &result); // release memory allocated for this result, we are done with it. + +private: + + bool ComputeHull(unsigned int vcount,const btVector3 *vertices,PHullResult &result,unsigned int vlimit); + + class Tri* allocateTriangle(int a,int b,int c); + void deAllocateTriangle(Tri*); + void b2bfix(Tri* s,Tri*t); + + void removeb2b(Tri* s,Tri*t); + + void checkit(Tri *t); + + Tri* extrudable(btScalar epsilon); + + int calchull(btVector3 *verts,int verts_count, TUIntArray& tris_out, int &tris_count,int vlimit); + + int calchullgen(btVector3 *verts,int verts_count, int vlimit); + + int4 FindSimplex(btVector3 *verts,int verts_count,btAlignedObjectArray<int> &allow); + + class ConvexH* ConvexHCrop(ConvexH& convex,const btPlane& slice); + + void extrude(class Tri* t0,int v); + + ConvexH* test_cube(); + + //BringOutYourDead (John Ratcliff): When you create a convex hull you hand it a large input set of vertices forming a 'point cloud'. + //After the hull is generated it give you back a set of polygon faces which index the *original* point cloud. + //The thing is, often times, there are many 'dead vertices' in the point cloud that are on longer referenced by the hull. + //The routine 'BringOutYourDead' find only the referenced vertices, copies them to an new buffer, and re-indexes the hull so that it is a minimal representation. + void BringOutYourDead(const btVector3* verts,unsigned int vcount, btVector3* overts,unsigned int &ocount,unsigned int* indices,unsigned indexcount); + + bool 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); +}; + + +#endif + |