Difference between BF+LC (Universal Settings) and IM+LC

[DANIELE_CASAROLA]

hi!
Please take a look to the attachments.

The only light source on the scene is an homemade HDRI.
The Character stands on a plane with "Matte Object" + "Shadow" option ON

I've red about the same scene rendered once with Brute Force and once with Irradiance Map can give different results in pixel colors (saturation, brightness and so on), but in this case the shadow of the feet in the first example (Irradiance Map + Light Cache) is visible and long on the left, while in the second example (Brute Force + Light Cache, Universal Settings) is really short and no more visible.

I'd like to know if it's all right or if I'm missing to check or set some parameter.

Thank you very much!

[Neilg]

Your settings for the IRmap are just too low.

The IR map has trouble with stuff like that anyway, best to put the HDRI in a dome light and check on store with IR - the dome light makes sure it gets more samples where it needs them.

[DANIELE_CASAROLA]

thank you very much for answering me.

tried as you said and the feet shadow appears alwasy more visible and long on the left then the BF+LC method.

tried also a Progressive Path Tracing method, and it appears like the first (IM+LC).

Effectivly on the HDRI image, the light source (sun) is on the right, so the feet shadow of the first method (IM+LC) should be right, I don't understand why the Universal Settings (BF+LC) renders in a different way a shadow that sould be there.

Anyway, at this point I think I should choose the method whose output I prefer

Thanks.

[3DMK]

I think that it could be a lack of LC sample density that's causing your problems.
See the post below for an explanation.
Cheers

http://www.chaosgroup.com/forums/vbu...050#post410050