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001687_owner-lightwav…mail.webcom.com_Tue Oct 31 10:30:20 1995.msg
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1995-11-07
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Date: Tue, 31 Oct 95 12:19:09 EST
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In-Reply-To: <Pine.SUN.3.91.951031013948.9705A-100000@access1.digex.net>
(from Ernie Wright <erniew@access.digex.net>)
(at Mon, 30 Oct 1995 22:49:55 -0800)
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From: mark@fusion.MV.COM (Mark Thompson)
To: lightwave@mail.webcom.com
Subject: Re: Refraction?
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Ernie Wright <erniew@access.digex.net> asks:
> > Does the Refractive Index value entered itself have any effect on
> > rendering times?
> > Yes, but not significantly.
>
> How come?
There may be other factors involved (although I can't think of any), but
the main reason I would expect is that an increased refractive index
increases the likelyhood of raytracing recursion (more ray bouncing). And
in the case of total internal reflection (the likelyhood of which also
increases with higher RI values), it would go to the recursion limit before
it proceeded to the next ray. If I remember correctly, LW's recursion
limit is 6 bounces.
*~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~*
* Mark Thompson (603) 424-1829 *
* Fusion Films, Inc. mark@fusion.mv.com *
* Director of Animation and Special FX *
~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~~
--
mark@fusion.MV.COM (Mark Thompson) sent this message.
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