File:Kilgarddorbie4.png

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.

This work is copyrighted (or assumed to be copyrighted) and unlicensed. It does not fall into one of the blanket acceptable non-free content categories listed at Wikipedia:Non-free content § Images or Wikipedia:Non-free content § Audio clips, and it is not covered by a more specific non-free content license listed at Category:Wikipedia non-free file copyright templates. However, it is believed that the use of this work: To illustrate the subject in question Where no free equivalent is available or could be created that would adequately give the same information On the English-language Wikipedia, hosted on servers in the United States by the non-profit Wikimedia Foundation, qualifies as fair use under United States copyright law. Any other uses of this image, on Wikipedia or elsewhere, may be copyright infringement. See Wikipedia:Non-free content and Wikipedia:Copyrights. Fair use //en.wikipedia.org/wiki/File:Kilgarddorbie4.png true