File:Kilgarddorbie4.png

Summary
A montage of 4 outputs of an OpenGL demo programs to show technical features.
 * Top left: patchy planar reflections
 * Top right: underwater caustics
 * Bottom left: virtualized light sources
 * Bottom right: reflections and shadows using the stencil buffer

Three images were created by Mark Kilgard using GLUT and one by Angus Dorbie to accompany a descriptions by Mark Kilgard. I believe fair use protects their use as these are already widely and freely distributed and available with source code for technical illustrative purposes. The montage was assembled by the submitter who is the author of one image and helped Mark generate one of the others, and they were all originally created for free dissemination and education, including redistributable code.

Fair use rationale is that the software was released as freely available sample source code for educational purposes. These shots form part of the historical record and are presented as limited resolution screenshots for educational purposes here.