Jonathan Mack

Lighting is deferred in Karma: the material has no ability to do lighting or shadowing. A composite post process is probably the correct approach in this case--using the slap comp framework makes it possible to have a post process seamlessly applied without a separate step.

gui2one
Error loading lens shader: Unable to load shader 'op:/obj/cylindrical_lens_test/LENS_SHADER/gui2one_cylindrical_lens1'
Command Exit Code: 1

Unfortunately, offline karma renders cannot use lens shaders defined by nodes, only those defined by HDAs, as they can be read from disk.

There should be seams there, because the tangent space is discontinuous across the seam. What matters is if the computed world space normal after applying the normal map also has a seam and if there is a shading discontinuity. There will always be some shading discontinuity across normal map seams, but ideally it's subtle.

Sorry if the answer is, "avoid seams, and place necessary ones across logical geometric boundaries"