Quote - On a final thought, I made sure there was absolutely NO Occlusion on any of the objects or materials.  Meaning, stay clear of AO when rendering with IDL. You don't need it, as you probably already know, and it just muddles up the light calculations.

I've just spotted this post by Maxxx earlier in the thread...

...I've still been unsure about whether to include AO nodes with the "Evaluate in IDL" option ticked in some shaders.. or not... should I not be doing this??

Come to think of it, the last scene I was trying where I had this consideration, that I recall, I was using Stonemason's Utopia C set.

The default shaders in this set have AO nodes set up. I'd gone through and ticked the "Evaluate in IDL" for all of these. But I was certainly having blotchiness issues, rendering with IDL.

Was this likely due to the AO nodes... i.e. should I just be ditching these AO nodes altogether then? Are they serving any purpose other than interference, when I'm using IDL?

Cheers ;-)