Implicit Surface Generation#76
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Implemented the marching square algorithm and a simple 2D Function plotter.
The implementation is located in the Elements/extensions/ImplicitSurface folder and is split into two files: marching_cubes.py for the main algorithm and triangulation_table.py for the triangulation table used for the marching square algorithm.
Implemented a simple Blinn-Phong shader which assigns a different color to each side of the surface. This is meant to make the generated surfaces more visible.
Finally, there is a very simple .obj file encoding implementation. This is used by the two classes to save the generated meshes into wavefront .obj files.
Also created three demo examples. Two of them are interactive example where the user can dynamically change parameters and the surface will regenerate in real time (example_marching.py, example_function_graph.py). The third example illustrates a simple technique one can use to create simple animated surfaces and use external parameters for the expression.