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subsurface scattering (was Re: Any user group reports?)

subsurface scattering (was Re: Any user group reports?)

2004-08-18       - By Jim Rothrock

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MessageThe mental ray SSS phenomena use two core shaders.  The first shader is
fast but not physically based, and is intended for rendering skin.  The second
is more accurate but requires GI.  I don't know about the second one, but the
first cannot currently work with XSI because a light map shader is used to
collect irradiance, and XSI does not support light map shaders.  Until XSI
supports light map shaders, the only way to use the fast SSS shader is to
render with stand-alone mental ray after processing the .mi files with a script
that inserts the shader declarations and definitions.
--
Jim Rothrock | jimr@(protected)

-- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- ---- -----

   From: owner-xsi@(protected) [mailto:owner-xsi@(protected)] On Behalf Of
Simon Wutherich
   Sent: Wednesday, August 18, 2004 1:10 PM
   To: 'XSI@(protected)'
   Subject: RE: Any user group reports?

   

   My thoughts exactly....

   Im sure the fake SSS are good enough...it was just the thought that it had
been there all along....and I didn't know!

   

   -- --Original Message-- --
   From: Todd Alan Peleg [mailto:trent716@(protected)]
   Sent: Wednesday, August 18, 2004 12:00 PM
   To: XSI@(protected)
   Subject: Re: Any user group reports?

   

   i was kinda thinking the same thing..

   i mean the one mark showed was impressive... but.. since it used GI.. it
kinda made me wonder a bit about how much i could use it in production.. where
as the fake i could see myself using much more...

   plus the whole question of my machine.. vs. the kickass machines they had
at the user group demo.

   i was mostly concerned that they said the one inside XSI .. so i felt like.
. its been there the whole time??? why didn't i know?

   todd

   Andre DeAngelis wrote:

   Wow the way this shader is being anticipated, and the way Mental Images are
being so cloack and dagger about the whole thing, you'd think they were
releasing an entirely new renderer.

   

   Given that there are a few free fake SSS shaders fIoating around,  it
really that big a deal?

   

   AD


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<DIV><FONT face=Arial size=2>The mental ray SSS phenomena use two core
shaders.&nbsp; The first shader is fast but not physically based, and is
intended for rendering skin.&nbsp; The second is more accurate but requires
GI.&nbsp; I don't know about the second one, but the first cannot currently
work
with XSI because a light map shader is used to collect irradiance, and XSI does
not support light map shaders.&nbsp; Until XSI supports light map shaders, the
only way to use the fast SSS shader is to render with stand-alone mental ray
after processing the .mi files with a script that inserts the shader
declarations and definitions.</FONT></DIV>
<DIV><FONT face=Arial size=2>--<BR>Jim Rothrock | <A
href="mailto:jimr@(protected)">jimr@(protected)</A></FONT></DIV>
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   face=Tahoma color=black size=2><SPAN
   style="FONT-SIZE: 10pt; COLOR: windowtext; FONT-FAMILY: Tahoma">
   owner-xsi@(protected) [mailto:owner-xsi@(protected)] <B><SPAN
   style="FONT-WEIGHT: bold">On Behalf Of </SPAN></B>Simon
   Wutherich<BR><B><SPAN style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday,
   August 18, 2004 1:10 PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B
>
   'XSI@(protected)'<BR><B><SPAN
   style="FONT-WEIGHT: bold">Subject:</SPAN></B> RE: Any user group
   reports?</SPAN></FONT><FONT color=black><SPAN
   style="COLOR: windowtext"><o:p></o:p></SPAN></FONT></P></DIV>
   <P class=MsoNormal><FONT face="Times New Roman" color=black size=3><SPAN
   style="FONT-SIZE: 12pt"><o:p>&nbsp;</o:p></SPAN></FONT></P>
   <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
   style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">My thoughts
   exactly....</SPAN></FONT><o:p></o:p></P>
   <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
   style="FONT-SIZE: 10pt; COLOR: navy; FONT-FAMILY: Arial">Im sure the fake
   SSS are good enough...it was just the thought that it had been there all
   along....and I didn't know!</SPAN></FONT><o:p></o:p></P>
   <P class=MsoNormal><FONT face=Arial color=navy size=2><SPAN
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   size=2><SPAN
   style="FONT-SIZE: 10pt; COLOR: windowtext; FONT-FAMILY: Tahoma">----
-Original
   Message-- --<BR><B><SPAN style="FONT-WEIGHT: bold">From:</SPAN></B> Todd
   Alan Peleg [mailto:trent716@(protected)] <BR><B><SPAN
   style="FONT-WEIGHT: bold">Sent:</SPAN></B> Wednesday, August 18, 2004 12:00
   PM<BR><B><SPAN style="FONT-WEIGHT: bold">To:</SPAN></B>
   XSI@(protected)<BR><B><SPAN style="FONT-WEIGHT: bold">Subject:</SPAN></B>
   Re: Any user group reports?</SPAN></FONT><o:p></o:p></P>
   <P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
   color=black size=3><SPAN
   style="FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P>
   <P class=MsoNormal
   style="MARGIN-BOTTOM: 12pt; MARGIN-LEFT: 36pt; MARGIN-RIGHT: 0cm; mso
-margin-top-alt: 0cm"><FONT
   face="Times New Roman" color=black size=3><SPAN style="FONT-SIZE: 12pt">i
   was kinda thinking the same thing..<BR><BR>i mean the one mark showed was
   impressive... but.. since it used GI.. it kinda made me wonder a bit about
   how much i could use it in production.. where as the fake i could see
myself
   using much more...<BR><BR>plus the whole question of my machine.. vs. the
   kickass machines they had at the user group demo.<BR><BR>i was mostly
   concerned that they said the one inside XSI .. so i felt like.. its been
   there the whole time??? why didn't i know?<BR><BR>todd<BR><BR>Andre
   DeAngelis wrote:<o:p></o:p></SPAN></FONT></P>
   <DIV>
   <P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial color=blue
   size=2><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Wow
   the way this shader is being anticipated, and the way Mental Images are
   being so cloack and dagger about the whole thing, you'd think they were
   releasing&nbsp;an entirely new renderer.</SPAN></FONT><o:p></o:p></P></DIV>
   <DIV>
   <P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
   color=black size=3><SPAN
   style="FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
   <DIV>
   <P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face=Arial color=blue
   size=2><SPAN style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">Given
   that there are a few free fake SSS shaders fIoating around, &nbsp;it really
   that big a deal?</SPAN></FONT><o:p></o:p></P></DIV>
   <DIV>
   <P class=MsoNormal style="MARGIN-LEFT: 36pt"><FONT face="Times New Roman"
   color=black size=3><SPAN
   style="FONT-SIZE: 12pt">&nbsp;<o:p></o:p></SPAN></FONT></P></DIV>
   <DIV>
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   style="FONT-SIZE: 10pt; COLOR: blue; FONT-FAMILY: Arial">AD</SPAN></FONT><o
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