More tweaks to non-overlapping lines methodology.
	modified:   Assets/Code/Drawing/Layer.cs
	modified:   Assets/Scenes/TestScene.unity
first pass at patch triangle
	modified:   Assets/Code/Drawing/Layer.cs
	modified:   Assets/Code/Drawing/Sprite3D.cs
Getting closer with the patch triangle.

	modified:   Assets/Code/Drawing/Layer.cs
modified:   Assets/Code/Drawing/Sprite3D.cs
Patch triangle size is the correct size and UVs. Positioning is a little
off right now.

	modified:   Assets/Code/Drawing/Layer.cs
	modified:   Assets/Code/Drawing/Sprite3D.cs