From: Scott Herod (herod++at++rtset.com)
Date: 02/29/2000 17:00:51
Hello,
I have another question about drawing order and the relationship
to the depth buffer. If I have a symmetric, prospective pfChannel
and draw a rectangular geoset that is perpindicular to the frustum's
axis, the depth buffer is filled with a rectangle of constant
values. ( It's easy to check and is essentially similar triangles. )
On the other hand, depth sorting of transparent geosets seems to
be done by computing the Euclidean distance between the centers of
the geosets' bounding spheres and the eye-point.
Why isn't depth sorting of geosets computed so that iso-surfaces
are planes parallel to the front and rear clipping planes as is the
case for filling the depth buffer rather than concentric spheres?
Is is easy to change the sorting algorithm?
Thank you.
Scott Herod
herod++at++rtset.com
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