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When drawn in the wrong order, the fill of a shape (Triangle, Quad, or Vertex) will not be visible from the perspective of the camera.
Possible solutions that come to mind:

1. checking the normal of faces and then inverting those that have an incorrect face orentation.
2. checking first face's normal and if it is in the wrong orientation, reverse the order in which they are created/drawn.
3. use a material with dual side rendering / disabled culling.

see ProcessingLite.PShape.ShapeFill for mesh creation.