Does anyone know what sort of information is stored in an .mtl. I know it's the general info for uv's, textures, etc. I'm just curious as to why Terragen can load the diffuse colour image, but not the normal map or specular map. Are these not in the .mtl file?
On a somewhat related note, is there a reason why there is a significant lag when nudging the sliders in the object texture window? It is quite frustrating waiting for it when you have multiple textures and you have to slide it for each map. Perhaps this could be reprogrammed to only do it once after the maps and sliders have been input?