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use btHullShape/btConvexHull to reduce vertices in a convex hull. Perhaps we always use this, to avoid convex objects with too many vertices...?

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This commit is contained in:
ejcoumans
2008-01-24 01:35:34 +00:00
parent 03a05c25af
commit c86fea11dc
2 changed files with 39 additions and 8 deletions
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41
Demos/ConvexDecompositionDemo/ConvexDecompositionDemo.cpp
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@@ -21,7 +21,7 @@ subject to the following restrictions:
#include "LinearMath/btQuickprof.h"
#include "LinearMath/btIDebugDraw.h"
#include "LinearMath/btGeometryUtil.h"
#include "BulletCollision/CollisionShapes/btShapeHull.h"
//#define USE_PARALLEL_DISPATCHER 1
#ifdef USE_PARALLEL_DISPATCHER
@@ -143,7 +143,7 @@ void ConvexDecompositionDemo::initPhysics(const char* filename)
btVector3 localScaling(6.f,6.f,6.f);
//export data to .obj
printf("ConvexResult\n");
printf("ConvexResult. ");
if (mOutputFile)
{
fprintf(mOutputFile,"## Hull Piece %d with %d vertices and %d triangles.\r\n", mHullCount, result.mHullVcount, result.mHullTcount );
@@ -284,7 +284,8 @@ void ConvexDecompositionDemo::initPhysics(const char* filename)
btVector3 localScaling(6.f,6.f,6.f);
for (int i=0;i<wo.mTriCount;i++)
int i;
for ( i=0;i<wo.mTriCount;i++)
{
int index0 = wo.mIndices[i*3];
int index1 = wo.mIndices[i*3+1];
@@ -301,7 +302,37 @@ void ConvexDecompositionDemo::initPhysics(const char* filename)
trimesh->addTriangle(vertex0,vertex1,vertex2);
}
btCollisionShape* convexShape = new btConvexTriangleMeshShape(trimesh);
btConvexShape* tmpConvexShape = new btConvexTriangleMeshShape(trimesh);
printf("old numTriangles= %d\n",wo.mTriCount);
printf("old numIndices = %d\n",wo.mTriCount*3);
printf("old numVertices = %d\n",wo.mVertexCount);
printf("reducing vertices by creating a convex hull\n");
//create a hull approximation
btShapeHull* hull = new btShapeHull(tmpConvexShape);
btScalar margin = tmpConvexShape->getMargin();
hull->buildHull(margin);
tmpConvexShape->setUserPointer(hull);
printf("new numTriangles = %d\n", hull->numTriangles ());
printf("new numIndices = %d\n", hull->numIndices ());
printf("new numVertices = %d\n", hull->numVertices ());
btConvexHullShape* convexShape = new btConvexHullShape();
for (i=0;i<hull->numVertices();i++)
{
convexShape->addPoint(btPoint3(hull->getVertexPointer()[i]));
}
delete tmpConvexShape;
delete hull;
m_collisionShapes.push_back(convexShape);
float mass = 1.f;
@@ -337,7 +368,7 @@ void ConvexDecompositionDemo::initPhysics(const char* filename)
unsigned int maxv = 16;
float skinWidth = 0.0;
printf("WavefrontObj num triangles read %i",tcount);
printf("WavefrontObj num triangles read %i\n",tcount);
ConvexDecomposition::DecompDesc desc;
desc.mVcount = wo.mVertexCount;
desc.mVertices = wo.mVertices;