beginnings of support for barrel-shaped objects.
Change color scheme in Penrose cubes.
minor
Important bugfix for the shape of concave cubit walls!
New version of CU_242
minor.
Important fix for the way vectors normal to the surfaces of the faces of the cubits are computed.
Before this was buggy in case of concave faces (CoinTetrahedron, CoinHexahedron, O2) - direction of the normal vector was wrong.
If an object is re-stickered so that there are less colors on its faces than originally, block submitting records.
Objects can support or not changing colors of their stickers.
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