The file may contain any of the following entities in any order. None of the parameters may be left out. The last parameter for every primitive is a .PCX texture filename. If that filename cannot be loaded, the object's assigned RGB color is used instead. Thus if you want no texture, but just a solid color, specify a texture filename that does not exist.
Textures be of dimensions that are powers of two.
For example 256x256 or 1024x512 or 128x128. The format MUST be PCX Version 5.0 with 256 colors. If texture.pcx cannot be loaded the RGB color will be used. If the file exists, the RGB values will be ignored. Reflectivity is 0.3 and specularity is 20.