Wanted: nice render with new Sun/Sky model

[CTZn]

CTZn, I've been actually trying to render it with aperture diffraction (AD Post Process) turned on, but for some reason I couldn't achieve desired quality/render speed with it. It caused overall bluriness of the image (look at the first images I've posted in this thread [I've removed fireflies in photoshop and adjusted the sharpness as well but it still looks somewhat blurry]), huge amount of fireflies and really weird huge reddish circular artifacts at certain sun angle (sun near horizon, camera just above the ground).

Well you've been through it so you know better

I think it might be due to the [...] high reflectivity of grass (60% Phong component with ior 10 mixed with blend of diffuse transmiter and phong ior 3.0)

Oh my, yes probably.

If we are talking about actual IOR values they are off limits in my opinion, also the double blend is probably a bit of an overkill for grass. Now my experience is empirical, I don't have captured grass data to back me up

I bet there are many recipes around, here's mine for a generic grass:

Phong with IOR close to the water IOR, around 1.33 +/- 0.2 and a rather low exponent (32 <-> 300), blended with a transmitter of the same albedo (60 <-> 90%).

Perhaps blendigo IOR is in percents ?

[haluperido]

If we are talking about actual IOR values they are off limits in my opinion, also the double blend is probably a bit of an overkill for grass. Now my experience is empirical, I don't have captured grass data to back me up

Thanks for pointing that out! I've chosen that settings just by impression and to match my grass reference photos. On the other hand I was always confused regarding IOR values for blended materials, so finally took some time to actually test it. I'll post it in other appropriate thread at Materials forum later on, maybe someone find it useful.