const char * NxuPhysicsExport::Write(NxClothMesh *clothMesh,const char *id)
{
const char *ret = 0;
if ( clothMesh )
{
for (NxU32 i=0; i<mCollection->mClothMeshes.size(); i++)
{
NxClothMeshDesc *c = mCollection->mClothMeshes[i];
if ( c->mInstance == clothMesh )
{
ret = c->mId;
break;
}
}
if ( !ret )
{
::NxClothMeshDesc desc;
clothMesh->saveToDesc(desc);
NxU32 numMesh = mCollection->mClothMeshes.size();
NxClothMeshDesc *cMesh = new NxClothMeshDesc;
if ( id )
{
cMesh->mId = id;
}
else
{
char tempString[512];
sprintf(tempString, "ClothMesh_%d", numMesh);
cMesh->mId = getGlobalString(tempString);
}
CustomCopy cc(mCollection,0);
cMesh->copyFrom(desc,cc);
cMesh->mInstance = clothMesh;
mCollection->mClothMeshes.pushBack(cMesh);
ret = cMesh->mId;
}
}
return ret;
}
bool PhysXCloth::cookMesh(NxClothMeshDesc &desc)
{
assert(desc.isValid());
MemoryWriteBuffer wb;
if (!NxCookClothMesh(desc, wb))
return false;
MemoryReadBuffer rb(wb.data);
mClothMesh = mScene->getPhysicsSDK().createClothMesh(rb);
return true;
}
// -----------------------------------------------------------------------
bool MyCloth::cookMesh(NxClothMeshDesc& desc)
{
// Store correct number to detect tearing mesh in time
mLastNumVertices = desc.numVertices;
// we cook the mesh on the fly through a memory stream
MemoryWriteBuffer wb;
assert(desc.isValid());
bool success = CookClothMesh(desc, wb);
if (!success)
return false;
MemoryReadBuffer rb(wb.data);
mClothMesh = mScene->getPhysicsSDK().createClothMesh(rb);
return true;
}
bool PhysXCloth::saveMeshDesc(NxClothMeshDesc &desc, ObjMeshExt* objMesh)
{
int vertexCount = objMesh->getNumVertices();
if (vertexCount == 0)
return false;
NxVec3* verts = (NxVec3*)malloc(sizeof(NxVec3) * vertexCount);
NxU32* faces = (NxU32*) malloc(sizeof(NxU32) * mNumTriangles * 3);
for (int i = 0; i < vertexCount; i++)
{
NxVec3 vertex = objMesh->getVertex(i);
verts[i].x = vertex.x;
verts[i].y = vertex.y;
verts[i].z = vertex.z;
}
for (int i = 0; i < mNumTriangles; i++)
{
ObjMeshTriangle tri = objMesh->getTriangle(i);
faces[i * 3] = tri.vertexNr[0];
faces[i * 3 + 1] = tri.vertexNr[1];
faces[i * 3 + 2] = tri.vertexNr[2];
}
desc.setToDefault();
desc.numVertices = vertexCount;
desc.numTriangles = mNumTriangles;
desc.pointStrideBytes = sizeof(NxVec3);
desc.triangleStrideBytes = 3 * sizeof(NxU32);
desc.points = verts;
desc.triangles = faces;
desc.flags = 0;
desc.flags |= NX_CLOTH_MESH_WELD_VERTICES;
desc.weldingDistance = 0.5f;
return true;
}