//--------------------------------------------------------------------------------------
// Name: ComputeFrameBoundingBox()
// Desc: Calls ComputeMeshBoundingBox for each frame with the correct transform.
//--------------------------------------------------------------------------------------
VOID Mesh::ComputeFrameBoundingBox( const MESH_FRAME* pFrame, const XMMATRIX matParent,
XMVECTOR& vMin, XMVECTOR& vMax )
{
// Initialize bounds to be reset on the first UnionBox
vMin.x = vMin.y = vMin.z = +FLT_MAX;
vMax.x = vMax.y = vMax.z = -FLT_MAX;
// Apply the frame's local transform
XMMATRIX matWorld = XMMatrixMultiply( pFrame->m_matTransform, matParent );
// Compute bounds for the mesh data
if( pFrame->m_pMeshData->m_dwNumSubsets )
{
XMVECTOR vMeshMin, vMeshMax;
ComputeMeshBoundingBox( pFrame->m_pMeshData, matWorld, vMeshMin, vMeshMax );
UnionBox( vMin, vMax, vMeshMin, vMeshMax );
}
// Compute bounds for any child frames
if( pFrame->m_pChild )
{
XMVECTOR vChildMin, vChildMax;
ComputeFrameBoundingBox( pFrame->m_pChild, matWorld, vChildMin, vChildMax );
UnionBox( vMin, vMax, vChildMin, vChildMax );
}
// Compute bounds for any sibling frames
if( pFrame->m_pNext )
{
XMVECTOR vSiblingMin, vSiblingMax;
ComputeFrameBoundingBox( pFrame->m_pNext, matParent, vSiblingMin, vSiblingMax );
UnionBox( vMin, vMax, vSiblingMin, vSiblingMax );
}
}
void Model::ComputeAllBoundingBoxes()
{
for (unsigned int meshIndex = 0; meshIndex < m_Header.meshCount; meshIndex++)
{
Mesh *mesh = m_pMesh + meshIndex;
ComputeMeshBoundingBox(meshIndex, mesh->boundingBox);
}
ComputeGlobalBoundingBox(m_Header.boundingBox);
}