I’m not sure what type of normal map compression Sketchfab uses but I’d like to see more options and user control for it.
- Option to dither normal maps imported from 16 bit files. There are cases when the compressed normal map would look better with or without dithering, it all depends on how it looks in the viewer. Dithering can be achieved in Photoshop by reducing the bit depth of the normal map manually in Photoshop or by re-saving to an 8 bit file format as tga. It would be nice to control this in the editor though as it would avoid having to reimport the file depending on preference.
- The ability to use higher bit depth normal maps. Something like 3dc/BC5.