TODO: why is this not in linux mouse interactor only and why is it in renderwindow ?

* This function is used by ImGui to get a pointer to the private member */

* The float2 returned is (roughness, metallic) */

* Returns the surface at a pixel in the previous frame (so before the camera moved if it is in motion) * This is needed for unbiasedness in motion in

* This function gives an approximation of the energy lost by the clearcoat layer * by assuming that whatever is under the clearcoat is lambertian (wh

* Overload if you already the hash grid cell index */