"nXt doesn't really work like that-- all of the objects need to be taken. An object which is hidden from view may show up in a reflection, a shadow, refracted through glass, contribute to diffuse reflection of light in the scene, etc..…"
"Sounds like good method... something I need to look into as I've never used tree images.
Assuming I want to continue working the old way using only fractal trees... Does AutoCAD and AccuRender take time to calculate trees hidden by buildings…"