There are two irradiance cache parameters - one for AO (used with IBL), one for IDL - normally only one applies as using AO with IDL creates redundant shadows, but artists like to do artistic things like exaggerate the shadows, so I suppose it is possible. The two are combined in the standard dialog, but completely change meaning when you enable/disable IDL.

The D3D dialog separates them. Assuming you never use AO and IDL together, only one matters.

If you use the built-in dialog to change IC, you can then open the D3D dialog to see what it did.

The main dialog seems to directly set the ray-tracing (AO) IC value, and then a translated version goes into the IDL IC value. The translation seems to be 25 + (.7 * V) where "V" is the value you used in the main dialog. So IDL IC goes from 25 to 95 - you cannot set other values from the main dialog.

Again - to be clear - when rendering with IDL, and not AO, the first IC does nothing at all. When rendering with IBL+AO, and not IDL, the second IC does nothing at all.

 

 

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Renderosity forum reply notifications are wonky. If I read a follow-up in a thread, but I don't myself reply, then notifications no longer happen AT ALL on that thread. So if I seem to be ignoring a question, that's why. (Updated September 23, 2019)