Add Water MDL to scene and it doesn't show in Path Trace

Thanks for that, have changed out the cube shape for a cube mesh and run a couple of test renders and looks fine. I do need to get an eGPU though as I’m finding with my MSI laptop i7 Stealth (Nvidia GeForce 2070 Max-Q 8Gb + Intel shared 16Gb GPU Memory) 32Gb Ram it’s struggling with the iRay renderer, the Real-Time render is fine though a wee bit laggy.