Added two new buttons:

• Export Mesh: Exports a 3D mesh of what is currently visible on screen.
These meshes can then be 3D printed, etc… (Unfortunately 4D printing is not yet available in this universe :P). Find the meshes in your Documents folder. Note that Shapeways' algorithm for filling the inside of meshes sadly fails on some of the coolest meshes like the Star Polychora from the last update, since they are filled with lots of polygons on the inside (btw it's fun to poke your head inside these meshes in VR!).
• Anti-Gravity: Creates an anti-gravity field that makes objects float. Besides the obvious coolness, this allows to see rotations that are unrestricted from the constraints of the collision with the ground.

A new page of shapes has been added, with one new level for each button. Visiting each of these levels unlocks the corresponding buttons. Also, all special buttons are now gathered into a new menu button. This lays the groundwork for easily adding new features in future updates!

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