Using and extending 3D primitives

• Primitives vs. rPrimitives

Built-in primitive types

• Triangle

• Polygon

• Point

• Mesh

• Particles

• ParticlesSprite

Extending a built-in primitive

• Why do this?

• What to subclass from

• What methods to override

Adding a new custom primitive

• Subclass from Primitive

Drawing in the 3D viewer

All primitives must provide methods to draw themselves in the 3D viewer. There are different drawing functions associated with different render passes:

• draw_solid

• draw_wireframe

Tesselating for the ScanlineRenderer

• tesselate