On Wed, Apr 4, 2012 at 5:40 PM, Frederic Bouvier wrote:
> As for the performance, I have a vague recollection that you
> say that the trees are first drawn alpha-tested and then
> alpha-blended. Can you elaborate on this if it's true ?
Yes. There's some documentation describing how it works
in Effects/tree.eff:
Trees are drawn in two passes. The first draws the opaque parts
with z writes enabled. The second draws the the transparent bits
with z testing enabled and z writes disabled. The transparent
tree silhouettes will blend correctly against the opaque
geometry. They may cause artifacts when blending against other
edges, but the overall "forest" is supposed to be nice and
fuzzy. There might also be artifacts when blending over other
transparent objects, but that's mostly unavoidable.
Note: no sorting needed!
Tim Moore was responsible for it, so I don't have any further insight.
-Stuart
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