Is it possible to use mist in a Cycles scene in addition to a world background?
First, set a world background.
Then, go to the Render context in Properties and enable
Transparent (in the
Create two render layers. For the first one, enable
Mist (in the
Passes panel). For the second render layer, disable
Z, and enable
Environment. Also, under
Exclude, select all layers (we only want the background texture).
Create this node setup:
The value in the
Multiply node controls the strength of the mist. The result is:
(my settings in the Mist Pass panel of World context were