When the World material has no texture input, create a solid color .hdr texture from the Background color instead. This is currently requried for the Hydra Storm render engine[1] [1] https://forum.aousd.org/t/usdluxdomelight-without-a-texture-file-attribute/1573 Co-authored-by: kiki <charles@skeletalstudios.com> Pull Request: https://projects.blender.org/blender/blender/pulls/123933