I
have a test scene with mr sun/sky and area light used as portal at the
window. Pretty standard setup. From what i understand there are 2
approaches to using portals - one is using FG only and bounces and the
other using GI with FG and photons. I wanted to compare these 2
methods. With all things equal, the GI was much darker than the FG with
mult bounces, which is contrary to what I thought and the examples I
have seen in maya/mr examples in maya help. Below is the FG shot with 3
bounces...
Here is the both GI and FG on (which turns off multibounce)
Just to note
i have portal light node in both light and photon shader slots under MR tab of area light.
emit photons is turned on in area light with 100K total photons,
intensity left to default which I think is supposed to be now
controlled by sun/sky
physical sky node is in the custom env slot of portal light
use light shape and visible are on.
GI is on in MR and using defaults.
I had read on post by Mr Zap that u dont need to mess around with
photons at all in this setup, just enable them and copy the portal node in the photon shader of light and thats it.
Why is the GI so much darker?
thanks