Xref: utzoo comp.sys.amiga:26439 comp.sys.amiga.tech:2752
Path: utzoo!utgpu!watmath!clyde!att!pacbell!ames!mailrus!tut.cis.ohio-state.edu!bloom-beacon!apple!well!ewhac
From: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Newsgroups: comp.sys.amiga,comp.sys.amiga.tech
Subject: Re: Turbo Silver File Format
Message-ID: <7906@well.UUCP>
Date: 12 Dec 88 05:09:36 GMT
References: <582@sactoh0.UUCP> <1893@wyse.wyse.com>
Reply-To: ewhac@well.UUCP (Leo 'Bols Ewhac' Schwab)
Followup-To: comp.sys.amiga
Organization: Very little.
Lines: 38
Quote: "Hope is very dangerous."  -- Servalan

In article <1893@wyse.wyse.com> leo@wyse.UUCP (Leo A. Hejza x1351) writes:
>can anybody explain how to produce a decent clear, spun object (Like a
>wine glass). I've tried. I can create the shape, set color to none, reflection
>to a litle and filter to transmit all. The result is pretty bad. 
>
>Anybody out there who knows how to do this?

	Well, the raytraced image I recently sent to Bob Page via
comp.binaries.amiga (poke, prod) has a couple of decent-looking wine glasses
in it.

	After some experimenting, I found that Silver's default for index of
refraction on glass was too high for a wine glass.  So I set it to 1.1, and
it came out okay.

	You have to keep the wall of the goblet as thin as possible, or the
rays will bounce around inside the goblet until the tracer gives up, and
you'll get the default color.  This happens more often than you might think.
The defualt color is what you set the objects color to.

	Spin the object, set its color to that of the light source (usually
white), reflection to a little (about 32), and filter to 255.  Also, you
might care to set the resolve depth in the global requester to 15.  This
will give the rays more chance to bounce their way out of the glass.  Also,
set the horizon and zenith colors to something interesting.  A good-looking
glass just doesn't happen; you have to put stuff around it for it to reflect
and refract.

	If, after playing around, you can't get something good, I'll mail
you the glass I created for my raytracing, which I think is halfway decent.

	Incidentally Bob, about when can I expect to see that posted?

_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_-_
Leo L. Schwab -- The Guy in The Cape	INET: well!ewhac@ucbvax.Berkeley.EDU
 \_ -_		Recumbent Bikes:	UUCP: pacbell > !{well,unicom}!ewhac
O----^o	      The Only Way To Fly.	      hplabs / (pronounced "AE-wack")
"Work FOR?  I don't work FOR anybody!  I'm just having fun."  -- The Doctor