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 :)

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