EnigmA Amiga Run 1997 July/EnigmA AMIGA RUN 20 (1997)(G.R. Edizioni)(IT)[!][issue 1997-07 & 08][EAR-CD IV].iso/lightwave/lwmlist/96.lightwave-0108/[e-mail] _Fri Jan 12 02:50:41 1996.msg

Internet Message Format | 1996-02-03 | 2KB

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From: "Eric Gooch" <[e-mail]>
To: Multiple recipients of list <[e-mail]>
Subject: Invisible shadow objects
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Ever wanted to have an invisible object throw a shadow? Object dissolve
doesn't work...if you dissolve the object completely, it stops throwing a
shadow. You can try flipping the polygons so they're invisible to the
camera, but still throwing shadows, but this only works at certain angles
in specific situations. I stumbled onto a strange technique for this
recently...Distance dissolve.

Take a flat plane (ground object) and a sphere (shadow throwing object).
Place the sphere over the ground, and turn on Distance dissolve for the
sphere, with a maximum distance of say, .01. Now the sphere will always be
invisible, but it still casts a shadow, whether you're using ray-traced or
shadow-mapped lights. Weird, huh?

For even more fun, turn on polygon edges to bright green. Now you have a
bright green wireframe object that casts a solid shadow. (I'll have to
admit I can't think of a use for that last bit, but maybe you can.   8)



-Eric G.