Fix UStrip mess #1
Description
UStrip was intended to be a way to access the faces generated by QUAD_STRIP and similar mechanisms inside a UGeometry instance. But it's currently an ugly hack and needs fixing. To consider:
- Provide means of transferring UStrips during UGeometry.add(UGeometry)
- Face ID indexing only
- Calculate vertex list for strip on demand
- Provide means of drawing strip
- Set color for all faces / vertices in strip