This library [initially] used some [piece of] implementations (may include codes) from these open source projects/resources: 1. Affine Transforms The original glm repo (g-truc), url: https://github.com/g-truc/glm LICENSE[S]: The Happy Bunny License (Modified MIT License) The MIT License Copyright (c) 2005 - 2016 G-Truc Creation FULL LICENSE: https://github.com/g-truc/glm/blob/master/copying.txt 2. Quaternions Anton's OpenGL 4 Tutorials book source code: LICENSE: OpenGL 4 Example Code. Accompanies written series "Anton's OpenGL 4 Tutorials" Email: anton at antongerdelan dot net First version 27 Jan 2014 Copyright Dr Anton Gerdelan, Trinity College Dublin, Ireland. 3. Euler Angles David Eberly Geometric Tools, LLC http://www.geometrictools.com/ Copyright (c) 1998-2016. All Rights Reserved. Computing Euler angles from a rotation matrix (euler.pdf) Gregory G. Slabaugh 4. Extracting Planes Fast Extraction of Viewing Frustum Planes from the World-View-Projection Matrix Authors: Gil Gribb (ggribb@ravensoft.com) Klaus Hartmann (k_hartmann@osnabrueck.netsurf.de) 5. Transform AABB Transform Axis Aligned Bounding Boxes: http://dev.theomader.com/transform-bounding-boxes/ https://github.com/erich666/GraphicsGems/blob/master/gems/TransBox.c 6. Cull frustum http://www.txutxi.com/?p=584 http://old.cescg.org/CESCG-2002/DSykoraJJelinek/