Otoy just replied us. They have identified the problem, and will fixed in Octane 2022.1 - 13.16.
I t would be nice in itoo forest 9 to have random scatter noise that is procedural and never repeats for scattering and automatic max density, count, poly count system that adjusts for me so we dotn have to manually adjust all there parameters that always pop up. I think AI based scattering is a must
We have not included a random scatter mode (placing items randomly along the full area), because it doesn't fit well with some of the Forest optimization processes.
Scattering by bitmap lets us to divide it by rows, and process them in separated threads. Also camera and area clipping can be optimized with specific algorithms.
If you want to get maximum density, i would suggest to apply a 'Full' distribution map, Random Translation 10%, and set zero in the Display/Distribution limits to disable them.
You can store this configuration in a
preset, to apply it easily.
Also it's possible to use a Noise procedural map as distribution image, if you prefer this approach.
Although the Noise map cannot be saved in General->Presets, it can be saved in the
Library to be reused.