Hi Brian,
Thanks for detailed answer.
Yes, I used “simulation” in a sense you got it - like, for instance, the visualization “canvas” in SpeedTree. Unfortunately looks like I cannot use UE4 with that intention in mind, looks like I will use preusdo-renderer I developed in my proprietary simulation software (It’s for procedurally generated assets like stones and materials, for now) while writing into fbx and then running UE Engine for a detailed result.