stl2ldraw v0.1.0

stl2ldraw

This is a utility to convert stl files to LDraw dat files.

This is still a prototype implementation with incomplete error
handling and other technical debt asking for further refactoring.
But in the end this was a weekend hack so far that actually works.

Features

• Reads binary and ascii STL files.
• Merges very close vertexes that would not produce visual
  differences but might cause non-manifold structures.
• Warns about incorrect normal vectors in the STL files and corrects
  them.
• Warns about detected non-manifold structures but does not correct
  them:
  • degenerated faces (faces spanning no area, meaning all points on
    one line)
  • open edges
  • ambiguous edges
• Merges adjacent triangles on the same plane to convex
  quadrilaterals.
• Generates lines for sharp edges (more than 25 degrees angle) and
  open edges.
• Generates optional lines for soft convex edges (less than 25 degrees
  angle). For concave edges they are not generates since they would
  never be visible by their concave nature anyway.