[Radiance-general] modeling trees in Radiance

[Compagnon Raphaël]

I think German's proposal is very clever for modelling a tree canopy "material". But if Joe is then using spheres for modelling the trees geometry, then the void percentage must be set to the square root of the tree canopy transmittance since a ray "transmitted" by the tree will always intersect twice with the sphere!

I hope this will help.

Raphaël