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http://codeinthehole.com/writing/pypi-readme-badges/ https://github.com/badges/shields https://pypip.in/downloads.html
https://pypi.python.org/pypi?%3Aaction=list_classifiers
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http://www.glprogramming.com/red/chapter05.html#name4
http://antigrain.com/research/adaptive_bezier/index.html https://groups.google.com/forum/?hl=de#!topic/comp.graphics.algorithms/S-UQXdD06dc http://stackoverflow.com/questions/1427422/cheap-algorithm-to-find-measure-of-angle-between-vectors/14675998#14675998 https://groups.google.com/forum/#!topic/comp.graphics.algorithms/2FypAv29dG4 https://en.wikipedia.org/wiki/B%C3%A9zier_curve http://www.caffeineowl.com/graphics/2d/vectorial/cubic-inflexion.html http://www.mdk.org.pl/2007/10/27/curvy-blues http://devmag.org.za/2011/04/05/bzier-curves-a-tutorial/ http://pomax.github.io/bezierinfo/ http://http.developer.nvidia.com/GPUGems3/gpugems3_ch25.html http://www.miaumiau.cat/2010/03/beziers-our-approach/
http://www.mactech.com/articles/develop/issue_25/schneider.html http://www.mactech.com/articles/develop/issue_25/schneider.html
http://matplotlib.org/examples/color/colormaps_reference.html
https://en.wikipedia.org/wiki/Web_colors
http://stackoverflow.com/questions/9489736/catmull-rom-curve-with-no-cusps-and-no-self-intersections https://en.wikipedia.org/wiki/Cubic_Hermite_spline#Monotone_cubic_interpolation https://en.wikipedia.org/wiki/Centripetal_Catmull%E2%80%93Rom_spline http://stackoverflow.com/questions/1085617/catmull-rom-splines-how-do-they-work http://www.cemyuksel.com/research/catmullrom_param/catmullrom.pdf
http://paulbourke.net/geometry/circlesphere/ https://en.wikipedia.org/wiki/Intersection_curve http://stackoverflow.com/questions/16045017/how-to-detect-line-segment-intersection-with-cylinder http://stackoverflow.com/questions/4078401/trying-to-optimize-line-vs-cylinder-intersection