BorisGoreta wrote:This force normal thing when LW viewport is in wireframe does not work with surfaces with polygon side node used. In wireframe mode Octane gets confused and doesn't know which side of the polygon is which.
Yes, this is the problem. If the Layout only has wireframe viewports, the mesh normals are not computed, so they are not available for the IPR. The plugin is using a Layout command added some version ago that forces the Layout to compute the normals for the external renderers, but sometimes it doesn't work fine. In any case, this is a Layout limitation.
Thanks,
-Juanjo