Shower cabin with onyx wall with lighting In order for the material on the render to look correct behind the wall with onyx, a light source is required. In the scene, this is the CoronaLaght mtl material. If you want to make a shot without backlighting, you need to apply a regular stone material with a stone texture from diffuse to the wall Corona version 10 CoronaLegacyMtl Materials In CoronaRender 6 and below CoronaLegacyMtl=CoronaMtl CoronaLegacyMtl requires Corona Renderer version 1.5 or higher
