Polynomial Texture Map Fitter is a PTM file creation utility. Polynomial Texture Map Fitter takes a set of images from various light positions as input and generates a PTM file as output. The locations of the input images are specified in a light positions file (.lp), along with the light direction for each image.
An example .lp file is included with the zip file. The first line of the lp file specifies how many input images are used. The subsequent lines specify the location of the input image and the x,y,z values of its light direction vector. The light direction vector is a normalized vector whose components range between -1 and +1. The supported input image formats are ppm, tga, and jpg.
Take Polynomial Texture Map Fitter for a spin to see what its all about!

The license of this software is Freeware, you can free download and free use this graphing software.