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Sample code for the article Ares Lagae and Philip Dutré. An efficient ray-quadrilateral intersection test. Journal of graphics tools, 10(4):23-32, 2005 If you use this code please cite the article. Copyright (c) 2004 Ares Lagae Permission is hereby granted, free of charge, to any person obtaining a copy of this software and associated documentation files (the "Software"), to deal in the Software without restriction, including without limitation the rights to use, copy, modify, merge, publish, distribute, sublicense, and/or sell copies of the Software, and to permit persons to whom the Software is furnished to do so, subject to the following conditions: The above copyright notice and this permission notice shall be included in all copies or substantial portions of the Software. THE SOFTWARE IS PROVIDED "AS IS", WITHOUT WARRANTY OF ANY KIND, EXPRESS OR IMPLIED, INCLUDING BUT NOT LIMITED TO THE WARRANTIES OF MERCHANTABILITY, FITNESS FOR A PARTICULAR PURPOSE AND NONINFRINGEMENT. IN NO EVENT SHALL THE AUTHORS OR COPYRIGHT HOLDERS BE LIABLE FOR ANY CLAIM, DAMAGES OR OTHER LIABILITY, WHETHER IN AN ACTION OF CONTRACT, TORT OR OTHERWISE, ARISING FROM, OUT OF OR IN CONNECTION WITH THE SOFTWARE OR THE USE OR OTHER DEALINGS IN THE SOFTWARE. This program is a minimal ray tracer. It ray traces a single quad, covered with a checkerboard texture, and outputs the image as "image.ppm". The classes provided in this file are not complete, only operations needed to implement the intersection algorithm and ray tracer are provided. To compile and run: $ g++ erqit.cpp -o erqit $ ./erqit See https://github.com/erich666/jgt-code/tree/master/Volume_10/Number_4/Lagae2005 for the most recent version of this file and additional documentation. Revision history 2004-10-08 initial version 2004-03-11 minor changes 2006-04-14 minor changes 2015-10-08 minor update for new JGT repository