1. I have a circular surface that is going to have a planar normal map applied along its Y axis. I have two choices: either one material for the entire disc that uses one large 16,384 x 16,384 image, or 16 materials spun around the Y axis that use the same copy of a smaller 1,024 x 16,384 image map that gets reused and rotated for each wedge-shaped material. Question: does Octane load an image file once per model, or does it load an image over and over again for each material that uses it? If it’s the latter, I would rather create one large 16K x 16K normal map that has more variation to it, rather than cloning and spinning a smaller normal map that won’t save me any memory.
2. Ever since LightWave 9.6, I have had it drilled into my head that image maps should have dimensions that are a multiple of 8 (e.g., 256 x 256, not 256 x 258) for the sake of memory usage efficiency. Question: is the "multiples of eight" rule of thumb something that also applies to the dimensions of images used in the OctaneRender Texture Image node?
(edited to clarify a couple of items)