mathmod  11.1
About: MathMod is a mathematical modeling software that visualize and animate implicit and parametric surfaces.
  Fossies Dox: mathmod-11.1-source.zip  ("unofficial" and yet experimental doxygen-generated source code documentation)  
mathmod Documentation

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Readme.txt 
Copyright © 2021 Abderrahman Taha (taha_ab@yahoo.fr)

Download: https://sourceforge.net/projects/mathmod/   
          https://github.com/parisolab/mathmod/releases
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Welcome to the realm of complex numbers!
Change-log for MathMod-11.1 (16/06/2021)
1) Support of graphing functions with complex numbers Z=u+iv in 3D and 4D spaces (demo scripts: "Complex3D_xx" and "Complex4D_Saddle")
2) Added support for HSV (hue, saturation, lightness) coloring model (script: "Complex_Domain_Coloring")
3) Texture definitions (RGB and HSV) for parametric surfaces can now be expressed as functions of complex numbers
4) Added a software implementation for the OpenGL variable gl_FrontFacing (fixed an issue with GPU drivers on MacOSX Catalina).
   The activation of this patch is available from mathmodconfig.js ("OpenGlConfig"-->"GL_FrontFacingSupport"=false)
    or the GUI("Appearance"-->"OpenGL Front Surface Support")
5) Bug-fixes, code optimization and documentation update.
   For a complete list of changes made during the course of development: https://github.com/parisolab/mathmod/milestone/4?closed=1