void ConvexData::BuildHull(const PODVector<Vector3>& vertices)
{
if (vertices.Size())
{
// Build the convex hull from the raw geometry
StanHull::HullDesc desc;
desc.SetHullFlag(StanHull::QF_TRIANGLES);
desc.mVcount = vertices.Size();
desc.mVertices = vertices[0].Data();
desc.mVertexStride = 3 * sizeof(float);
desc.mSkinWidth = 0.0f;
StanHull::HullLibrary lib;
StanHull::HullResult result;
lib.CreateConvexHull(desc, result);
vertexCount_ = result.mNumOutputVertices;
vertexData_ = new Vector3[vertexCount_];
indexCount_ = result.mNumIndices;
indexData_ = new unsigned[indexCount_];
// Copy vertex data & index data
memcpy(vertexData_.Get(), result.mOutputVertices, vertexCount_ * sizeof(Vector3));
memcpy(indexData_.Get(), result.mIndices, indexCount_ * sizeof(unsigned));
lib.ReleaseResult(result);
}
else
{
vertexCount_ = 0;
indexCount_ = 0;
}
}
void GenerateConvexHullSet(Ogre::Mesh* mesh, ConvexHullSet* ptr)
{
std::vector<float3> vertices;
GetTrianglesFromMesh(mesh, vertices);
if (!vertices.size())
{
LogError("Mesh had no triangles; aborting convex hull generation");
return;
}
StanHull::HullDesc desc;
desc.SetHullFlag(StanHull::QF_TRIANGLES);
desc.mVcount = (uint)vertices.size();
desc.mVertices = &vertices[0].x;
desc.mVertexStride = sizeof(float3);
desc.mSkinWidth = 0.01f; // Hardcoded skin width
StanHull::HullLibrary lib;
StanHull::HullResult result;
lib.CreateConvexHull(desc, result);
if (!result.mNumOutputVertices)
{
LogError("No vertices were generated; aborting convex hull generation");
return;
}
ConvexHull hull;
hull.position_ = float3(0,0,0);
/// \todo StanHull always produces only 1 hull. Therefore using a hull set is unnecessary and could be optimized away
#include "DisableMemoryLeakCheck.h"
hull.hull_ = shared_ptr<btConvexHullShape>(new btConvexHullShape((const btScalar*)&result.mOutputVertices[0], result.mNumOutputVertices, 3 * sizeof(float)));
#include "EnableMemoryLeakCheck.h"
ptr->hulls_.push_back(hull);
lib.ReleaseResult(result);
}