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Date: Thu, 1 Sep 1994 21:42:15 -0700 (MST)
From: Ernie Wright <[e-mail]>
Subject: Edge Transparency
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TONY ([e-mail]) wrote (twice):

>  Does any one know why edge transparency only seems to work on
>  spheres?  I've tried to get it to work on boxes with rounded
>  corners and spheres with boxes coming out of them...

It might be helpful to know that edge transparency works on polygons,
not polygon outlines.  With transparent edges turned on, polygons are
made transparent according to how nearly they are "edge on" to the
camera.  With spheres it's easy to see what happens, but boxes are a
little too simple to behave as you might expect.

Try the following experiment.  Load a cube into Layout, turn on trans-
parent edges, turn on smoothing, increase the max smoothing angle to
90.5 and render.  Repeat this after having subdivided the cube two or
three times.  Maybe it's not what you want, but it works.

If you want transparency only near the cube's edges, put some polygons
there and give them a different surface.

- Ernie