- last post: 01.01.0001 12:00 AM PDT
Simple Answer: It's a pixel shader trick.
CG Artist's Answer: A blurry image of Halo's rim is used as a texture map for a pixel shader that simulates volumetric light. The shader effect is scripted to travel across the image in time with loading progress, and it shines through the image in the lighter areas, while being blocked out in the darker ones. Volumetric lighting means that the light actually has a 3D shape, so the shader shines through in the form of visible light rays. You can see the same effect when you look at the sun through a tree in the second campaign mission.
Frankie's Answer: It's my pants.