following on from the last item, it occured to me: drive the ecosystem in a material by altitude. Thus trees low down but not high, without needing to make a mixed material etc. I found this tricky. Invert filter didn't work for me in this by the way. Edit Density of the eco material Input-Altitude and then Filter-Map to Density output. to achieve eco items at HIGHER altitudes the OUTPUT range must be such that the LOWER value must be less than the UPPER value. For eco items at LOWER altitudes the OUTPUT range must be such that the LOWER value must be greater than the UPPER value. Additonal note: the closer the two numbers are to each other, the more the ecomaterials will be thinned out, if the numbers are far apart, the ecoobjects will have a sharp edge to their distribution. Hoep that makes sense and works for you :)

How interesting. Thank you for sharing the info.

Sometimes I put dummy objects in the way of the ecosytem to control the output of the eco and take advantage of the decay near foreign object selection to control the ecosystem. Then I delete the objects. Sometimes I move the objects out of the way or scale them under the ground plane in case I need them again. Anyway, thanks again. Your knowledge is helping me understand vue much better.

This is fascinating research. Thanks very much for sharing.

Silverblade33,
On your first graphic, I would change the descriptions to:

"For low-altitude eco-objects, the upper-value must be of less magnitude than the lower-value".

"For high-altitude eco-objects, the upper-value must be of greater magnitude than the lower-value".

Is that correct? Thanks again. :)

gah yer right! sorry sick as a parrot in RL so rather prone to mistakes :>