Light cache only

[MANUEL_MOUSIOL]

Is there a way to get rid of brute force and use light cache only for gi?
i have two 2080 tis, one 1080 ti and a threadripper 2950x and my interiors are still too slow to render... I need to speed things up somehow.

[glorybound]

Isn't it just one or the other? I see one GI solution and it is either LC or BF.

[MANUEL_MOUSIOL]

I'm pretty sure primary is always brute force and we choose secondary. That's what I read somewhere anyway.

[MANUEL_MOUSIOL]

Yep, it's in the Docs:
The primary GI engine is always set to Brute Force

[joconnell]

Light cache isn't high enough quality for the primary bounce unless you increase retrace threshold and all that does is add in more brute force calculations. For an example, do a cpu render with light cache for primary and secondary and see what you think!

[MANUEL_MOUSIOL]

I see. What about IM by the way? It's not available in gpu mode... I wonder why .irradeance map is capable of good quality for primary, right?