Blender Support for Orbiter Mesh Files Code

The mesh groups should now sort themselves by material, with mesh groups having transparent materials being sorted to the end of the mesh file.

Fixed up the material sorting code a bit. It should no longer output multiple copies of the same material to the mesh file.

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Commented out a debug line that was causing issues for people without the debugger I am using (probably everyone)!

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First stab at sorting by transparency.

Fixed up some material and texture issues when multiple objects shared the same meterial / texture.

UV Texture mapping working.

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initial checkin