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000266_owner-lightwave-l _Mon Jan 23 21:00:06 1995.msg
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Return-Path: <owner-lightwave-l>
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From: j.follett@genie.geis.com
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(1.37.109.11/15.6) id AA096054339; Tue, 24 Jan 1995 02:25:40 GMT
Message-Id: <199501240225.AA096054339@relay2.geis.com>
Date: Tue, 24 Jan 95 01:21:00 UTC
To: lightwave-l@netcom.com
Subject: Traced Refraction
X-Genie-Id: 9918210
X-Genie-From: J.FOLLETT
Sender: owner-lightwave-l@netcom.com
Precedence: bulk
This is a request for help concerning refraction. I am modeling a
glass sphere with an object inside of it, similar to a paperweight.
When rendered, I get the typical black ring at the circumfrence of the
sphere. I also get small black flecks and large black splotches inside
the sphere. Reading all the LWPro articles on refraction, I tried each
fix without success.
I created a second sphere inside of the first, flipped the
polygons, and used a refractive index of 1 to remove the splotches
from total light reflection. I put the sphere inside of a large box,
to remove the black ring. I shrunk the inner sphere to remove the
flecks. Each render shows more and more problems, and each still
exists.
I encountered another problem with the object inside of the sphere. I
used 2 point polys to model the bristles of a broom. It looked
excellent without traced refraction on the sphere. Tracing refraction
caused the bristles to dissappear entirely. I haven't read about the
inability of Lightwave to deal with points and 2 point polys inside
of transparent refracted objects.
I am using Bundled Lightwave 3.5, on a stock 4000/040 with 18 meg. I
use Lightwave.fp, and have traced shadows, reflection and refraction
enabled. Any assistance I can get would be greatly appreciated.
Thanks, JF