Many thanks for MarkBremmer's work-around for the alpha mask problem. However I've noticed that the required mask for specific objects does not function if you are using the infinite plane, unless the infinite plane is made invisible before the render. Q:Is there a solution as in Bryce that when an object is sunk into the plane,that only the part of the object above the plane is alpha masked? Considering the breadth of the Carrara manual the vital sections on masking etc are incredibly brief.