Surfaces (3D and anaglyph) in rectangular "z = f (x, y)" and spherical "x=f(a,t), y=f(a,t), z=f(a,t)" coordinates. You can define any function and view its graphical representation. Save/open your surface data. Open any kind of image and use it for texture Capture the screen from the app menu. The image is saved in the Pictures folder.