Sometimes when textures are tiled many times on the model it is not possible to put them in a combined texture sheet. Could it be that the textures that are excluded are tiled?Importin the model in ModelConverterX i check the once by rotating before I start the rendering with the max texture [ add border: 0 pixels].
Then the rendering process started ...and after finished there ar 4 textures; a bitmap and three non combined textures.
Reducing all to a power of two and startin once the rendering..but also with the same unsatisfactor result.
MCX is not able to build a Bitmap with all of my textures.
Sometimes the drawcall minimizer works better if you first resize all textures to a power of two. That way it is sometimes easier to put them in the combined texture sheet.