"You keep on learning and learning, and pretty soon you learn something no one has learned before" Richard P. Feynman
Contact shadow (ground shadow)
RetAreaLight shadow
Progressive shadow
Screen Space Ambient Occlusion
Boolean 3D operation (CSG)
Dimensioning arrow
Perspective Viewing Frustum
BSP geometry - subtract cube
BSP geometry - subtract heart
geometry - extrude
Dashed line shader
Cube tilt (axis)