 | | | secondary ray | secondary ray 2005-03-30 - By Gerbrand Nel
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still feels like it shouldn't work this way, if I make something 100 %
transparent but still have highlights running on it, everything behind that
object should be a secondary ray... because it's a refraction on the
transparent object, even if the index of refraction is 1 ??? does anyone else
agree????? the funny thing is it starts working the moment you change the index
of refraction. usefull sometimes but isn't that what the sprite shader is for??
??
G
-- -- Original Message -- --
From: Jim Rothrock
To: XSI@(protected)
Sent: Tuesday, March 29, 2005 8:00 PM
Subject: Re: secondary ray
Haarm-Pieter Duiker wrote:
Transparency Rays aren't considered to be Secondary Rays. If you look in
the old "Progamming mental ray" book, Section 3.4 discusses the state and the
ray type variable state->type. Eye rays and Transparency rays are considered to
be primary. It appears, somewhat confusingly, that secondary rays are defined
to be rays generated at an intersection point. Guess the definition of primary
is overriding the definition of secondary in your case.
When not using scanline rapid, mi_trace_transparent() generates a primary ray
. When using scanline rapid, mi_trace_transparent() does not generate a ray at
all. If you want a secondary ray, call mi_trace_refraction().
--
Jim Rothrock | Stan Winston Digital | jimr@(protected)
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<DIV><FONT face=Arial size=2>still feels like it shouldn't work this way, if I
make something 100 % transparent but still have highlights running on it,
everything behind that object should be a secondary ray... because it's a
refraction on the transparent object, even if the index of refraction is 1 ???
does anyone else agree????? the funny thing is it starts working the moment you
change the index of refraction. usefull sometimes but isn't that what the
sprite
shader is for????</FONT></DIV>
<DIV><FONT face=Arial size=2></FONT> </DIV>
<DIV><FONT face=Arial size=2>G</FONT></DIV>
<BLOCKQUOTE
style="PADDING-RIGHT: 0px; PADDING-LEFT: 5px; MARGIN-LEFT: 5px; BORDER-LEFT:
#000000 2px solid; MARGIN-RIGHT: 0px">
<DIV style="FONT: 10pt arial">-- -- Original Message -- -- </DIV>
<DIV
style="BACKGROUND: #e4e4e4; FONT: 10pt arial; font-color: black"><B>From:</B>
<A title=jimr@(protected) href="mailto:jimr@(protected)">Jim
Rothrock</A> </DIV>
<DIV style="FONT: 10pt arial"><B>To:</B> <A title=XSI@(protected)
href="mailto:XSI@(protected)">XSI@(protected)</A> </DIV>
<DIV style="FONT: 10pt arial"><B>Sent:</B> Tuesday, March 29, 2005 8:00
PM</DIV>
<DIV style="FONT: 10pt arial"><B>Subject:</B> Re: secondary ray</DIV>
<DIV><BR></DIV>Haarm-Pieter Duiker wrote:
<BLOCKQUOTE
cite=mid5995792B428BD840906480B184A386CB011092D7@(protected)
type="cite">
<META content="MSHTML 6.00.2900.2523" name=GENERATOR>
<STYLE></STYLE>
<DIV><SPAN class=170290917-29032005><FONT face="Courier New"
size=2>Transparency Rays aren't considered to be Secondary Rays. If you
look
in the old "Progamming mental ray" book, Section 3.4 discusses the
state and the ray type variable state->type. Eye rays and Transparency
rays are considered to be primary. It appears, somewhat confusingly, that
secondary rays are defined to be rays generated at an intersection point.
Guess the definition of primary is overriding the definition of secondary
in
your case.</FONT></SPAN></DIV>
<DIV><SPAN class=170290917-29032005></SPAN></DIV></BLOCKQUOTE>When not
using
scanline rapid, mi_trace_transparent() generates a primary ray. When
using scanline rapid, mi_trace_transparent() does not generate a ray at
all. If you want a secondary ray, call mi_trace_refraction().<BR><PRE
class=moz-signature cols="72">--
Jim Rothrock | Stan Winston Digital | <A class=moz-txt-link-abbreviated href=
"mailto:jimr@(protected)">jimr@(protected)</A>
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