For this project I wanted to simulate light fog coming through window blinds. As the camera moves I wanted to see changes to the light moving through the fog.
Background with no Light Fog, Depth of Field, or Occlusion.
Adding Depth of Field.To add depth of field, I needed to render out a Z-depth channel. After that, in Shake, I blurred the image based on the Z-depth information.
Adding Light Fog.
To get the light fog pass, I applied a black surface shader to all the objects in the scene. Then I emitted a white light fog from the light beind the window. This created a mask I could use in compositing.
Adding Occlusion.The occlusion is then added to get the contact shadows.
+ Links
3DRender.com: Lighting Challenges