Hey there,
I just rendered out this scene and I have two quick questions:
The clouds are being partially lit by the light reflecting off the ground, making them green. Is there any way to turn off bounces for just the clouds?
There’s some serious noise going on with the vehicle (which is bright yellow in this render). I tried turning off caustics and using filter, but nothing worked. Any ideas?
1). You might want to replace the big quad with a real arealight (by way of add > lamps > area), there’s no real reason to use a meshlight in that case and the sampling will generally be superior.
2). You can make use of the ray depth output in the lightpath node to make the clouds show a simple black material if a ray hitting it has already bounced one or more times.