Renderer Enhancement: Distance Fog

[Michael D. Hafer]

Would like the renderer to have distance fog implemented and able to be enabled on a map through the Atlas map editor. Some variables would include:

• Thickness
  

• Tint
  

• Distance (the distance that the background becomes 100% obscured by the fog)
  

• anything else?
  

This would be a good way to visually mask the fact that we don't have other whiz-bang graphical features like normal maps and suchness.

[Philip Taylor]

I don't know why this was marked as fixed.

[fabio]

Fixed in r12755.

[wraitii]

In 12811:

Particles now correctly update with the fog. Refs #276 .