// add a subset of an array as a mesh.
public void AddCollidableMeshToTree(List <VertexPositionColor> collisionVertices,
int collisionStart, int count)
{
int collisionEnd = collisionStart + count; //collisionVertices.Count;
if (collisionStart != collisionEnd)
{
// break large meshes into triangles to improve AABB tree.
// TODO - also split meshes with large areas?
if (collisionEnd - collisionStart > 8000)
{
// add individual triangles from mesh
for (int i = collisionStart; i < collisionEnd;)
{
var points = new Vector3[3];
points[0] = collisionVertices[i++].Position;
points[1] = collisionVertices[i++].Position;
points[2] = collisionVertices[i++].Position;
m_collisionMeshTree.Insert(BoundingBox.CreateFromPoints(points), points);
}
return;
}
{
// Add collidable mesh to bb tree
var points = new Vector3[collisionEnd - collisionStart];
for (int i = collisionStart, dst = 0; i < collisionEnd; i++, dst++)
{
points[dst] = collisionVertices[i].Position;
}
m_collisionMeshTree.Insert(BoundingBox.CreateFromPoints(points), points);
}
}
}
