BF: Fix bug introduced in last change
Cannot pass a non-const rvalue (returned from volume.operator[]) through to final_transform. This is easily avoided by creating a local ShadowVolume instance, and passing that to final_transform.
Cannot pass a non-const rvalue (returned from volume.operator[]) through to final_transform. This is easily avoided by creating a local ShadowVolume instance, and passing that to final_transform.