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modified triangle mesh generation, to use btTriangleMesh, which is easier to build then the striding index/vertex arrays alternative.

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This commit is contained in:
ejcoumans
2006-10-11 20:45:11 +00:00
parent a337372905
commit f3b9dcd714
1 changed files with 9 additions and 22 deletions
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29
Demos/UserCollisionAlgorithm/UserCollisionAlgorithm.cpp
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@@ -30,7 +30,7 @@ static const int NUM_TRIANGLES=4;
btVector3 gVertices[NUM_VERTICES]; btVector3 gVertices[NUM_VERTICES];
int gIndices[NUM_TRIANGLES*3]; int gIndices[NUM_TRIANGLES*3];
const float TRIANGLE_SIZE=80.f; const float TRIANGLE_SIZE=20.f;
///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback; ///User can override this material combiner by implementing gContactAddedCallback and setting body0->m_collisionFlags |= btCollisionObject::customMaterialCallback;
@@ -69,22 +69,17 @@ int main(int argc,char** argv)
void UserCollisionAlgorithm::initPhysics() void UserCollisionAlgorithm::initPhysics()
{ {
#define TRISIZE 10.f #define TRISIZE 5.f
int vertStride = sizeof(btVector3);
int indexStride = 3*sizeof(int);
const int NUM_VERTS_X = 50; const int NUM_VERTS_X = 50;
const int NUM_VERTS_Y = 50; const int NUM_VERTS_Y = 50;
const int totalVerts = NUM_VERTS_X*NUM_VERTS_Y; const int totalVerts = NUM_VERTS_X*NUM_VERTS_Y;
const int totalTriangles = 2*(NUM_VERTS_X-1)*(NUM_VERTS_Y-1); const int totalTriangles = 2*(NUM_VERTS_X-1)*(NUM_VERTS_Y-1);
btVector3* gVertices = new btVector3[totalVerts]; btVector3* gVertices = new btVector3[totalVerts];
int* gIndices = new int[totalTriangles*3];
int i; int i;
for ( i=0;i<NUM_VERTS_X;i++) for ( i=0;i<NUM_VERTS_X;i++)
{ {
for (int j=0;j<NUM_VERTS_Y;j++) for (int j=0;j<NUM_VERTS_Y;j++)
@@ -93,29 +88,21 @@ void UserCollisionAlgorithm::initPhysics()
} }
} }
btTriangleMesh* trimesh = new btTriangleMesh();
int index=0; int index=0;
for ( i=0;i<NUM_VERTS_X-1;i++) for ( i=0;i<NUM_VERTS_X-1;i++)
{ {
for (int j=0;j<NUM_VERTS_Y-1;j++) for (int j=0;j<NUM_VERTS_Y-1;j++)
{ {
gIndices[index++] = j*NUM_VERTS_X+i; trimesh->addTriangle(gVertices[j*NUM_VERTS_X+i],gVertices[j*NUM_VERTS_X+i+1],gVertices[(j+1)*NUM_VERTS_X+i+1]);
gIndices[index++] = j*NUM_VERTS_X+i+1; trimesh->addTriangle(gVertices[j*NUM_VERTS_X+i],gVertices[(j+1)*NUM_VERTS_X+i+1],gVertices[(j+1)*NUM_VERTS_X+i]);
gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
gIndices[index++] = j*NUM_VERTS_X+i;
gIndices[index++] = (j+1)*NUM_VERTS_X+i+1;
gIndices[index++] = (j+1)*NUM_VERTS_X+i;
} }
} }
btTriangleIndexVertexArray* indexVertexArrays = new btTriangleIndexVertexArray(totalTriangles, delete[] gVertices;
gIndices,
indexStride,
totalVerts,(float*) &gVertices[0].x(),vertStride);
btCollisionShape* trimeshShape = new btBvhTriangleMeshShape(indexVertexArrays);
btCollisionShape* trimeshShape = new btBvhTriangleMeshShape(trimesh);
//ConstraintSolver* solver = new btSequentialImpulseConstraintSolver; //ConstraintSolver* solver = new btSequentialImpulseConstraintSolver;