When rendering in the Render View, my scene shows up correctly with the color I assigned to my objects. But when rendering to file or in MPlay, the objects show up black, but there is an alpha channel.
Skimming the forum, I didn't find anything that pointed me towards a solution. Could anybody tell me what I'm missing?
Your preview ROP (mantra_ipr) is using the raytrace engine, but your render_to_file ROP is using physically based rendering. Your shaders only support raytracing - they need to export a BSDF to work with PBR. (You need to connect the yellow F connector in the shader's surface_output)