Texture mapping

[AnalogArnold]

• Explore existing open-source libraries to see if we can use them for linear elements (libigl, xatlas, Blender)
• Linear elements: UV unwrapping implementation
• Linear elements: Mapping between mesh and texture coordinates
• Nonlinear elements: UV unwrapping implementation
• Nonlinear elements: Mapping between mesh and texture coordinates
• Use Joel's spline interpolator