Hi,
i have a problem with twin motion. When i dont use path tracing, the software export the assigned material. But when i turn on pathtracing the twinmotion material dont work.
somebody con help me?
Hi, I am having the same issue, I am sure that normals are not flipped, the same objects were rendered properly while working with previous TM versions. This issue happened after installing TM 2025.1.1. I’ve noticed that this issue happens more with more complicated objects - with more nested hierarchy by grouping and creating components. The model is imported from sketchup. Please please help 
try making materials two sided, or double checking again in sketchup using the style panel and the button for the the white/blue ish swatch. Previous versions were much more permissive with thin or infinitely thin materials being one sided and auto normaling them, but I think the update intentionally broke that. It can be time consuming but its easy to fix. If that doesnt do it, save a copy of your SU model and group all of those chairs and tables and then explode them a bunch, double check the normals show the white default material then jump back to TW, update to the new file reference and then double check that material (use eyedropper) and make sure it has double sided checked. It will very likely resolve your issue.