The folder includes a text file with simple instructions on how to make your own gradients for Incendia, plus a convenient mask to help you align your image file within the circular area that Incendia will use.
Suggestions for using gradients in Incendia: Assign a separate material number to the baseshape(s) to which you want to apply this gradient. Then, select this material number and apply this gradient to the ambient, the diffuse, or both.
As a rule, the closer the baseshape is to a sphere, the more clearly the image contained in the gradient will reflect. If the baseshape is complex, you'll still see the colors from the gradient, but the image will be scrambled.