yet another limitation..

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yet another limitation..

yet another limitation..

2004-02-26 - By Oz Adi

Back

Reply: << 11 12 13 14 15 16 17

RE: yet another limitation..ok.. now i am bit confused...

Francois showed an example which seems similar to my render tree setup.. and it
works..

i didnt plug the flower into the transperancy of phong4, because I wanted to
have a different material for the flower..
at first I even used a lambert node, cause i didnt want any specular..
This is just an excersize I gave my intern.. it's not for a real project...
I will try the ray_type again, on a new scene.. seems weird it works in
Francois's example and not in mine ..

anyway thanks for all who helped!

cheers,
Oz
www.coolcalb.com

-- -- Original Message -- --
From: Halfdan Ingvarsson
To: XSI@(protected)
Sent: Thursday, February 26, 2004 8:03 PM
Subject: RE: yet another limitation..

It's a bit of a bummer. The shadow color is changed as a side-effect so it
will not work with mixing.

Most shading works by returning a color but shadowing is different with
mental ray as it gives a color which is supposed to get modified.

Why don't you instead mix the alpha of the flower image with the transparency
input of Phong4?

- ½

-- --Original Message-- --
From: owner-xsi@(protected) [mailto:owner-xsi@(protected)]On Behalf
Of Oz Adi
Sent: Thursday, 26 February, 2004 12:05
To: XSI@(protected)
Subject: Re: yet another limitation..

I tried using the ray_type node, no luck there either :)

here's a few images to show the problem:

http://www.coolcalb.com/~oadi/pix/shadow.jpg

it's not for a project, I am teaching an intern, and she asked me why the
shadow went dark and opaque..
I still cant figure it up :)

If I am doing things right, it looks like a mental ray limitation.. (3.2)
or maybe it's my mental limitation hehe..

-- -- Original Message -- --
From: "Fran?ois Giard" <francois@(protected)>
To: <XSI@(protected)>
Sent: Thursday, February 26, 2004 6:20 PM
Subject: Re: yet another limitation..

> Hi Oz,
> put a ray type switch between your mix2 and shadow input ...
> hope this help
> -- -- Original Message -- --
> From: "Oz Adi" <oz@(protected)>
> To: <XSI@(protected)>
> Sent: Thursday, February 26, 2004 10:58 AM
> Subject: Re: yet another limitation..
>
>
> > it's already high..
> >
> > it's set to 4, and when the transparent phong is connected directly to
the
> > shadow,
> > the shadow looks ok, it looks transparent. when I connect the mix2colors
> > output to the shadow, it seems
> > like xsi dont know to use the mixed data, to determine where the shadow
> > should be opaque and where its transparent.
> > (I got an opaque sticker mixed onto the glass model)
> >
> >
> >
> > -- -- Original Message -- --
> > From: "Bernard Lebel" <atyss4si@(protected)>
> > To: <XSI@(protected)>
> > Sent: Thursday, February 26, 2004 5:46 PM
> > Subject: RE: yet another limitation..
> >
> >
> > > Make sure the refraction trace depth is high enough (at least 4).
> > >
> > >
> > > Cheers
> > > Bernard
> > >
> > >
> > >
> > > http://www.bernardlebel.com
> > > http://www.xsimontreal.com
> > > http://www.xsibase.com
> > >
> > >
> > >
> > >
> > >
> > > >From: "Oz Adi" <oz@(protected)>
> > > >Reply-To: XSI@(protected)
> > > >To: <XSI@(protected)>
> > > >Subject: yet another limitation..
> > > >Date: Thu, 26 Feb 2004 16:35:07 +0200
> > > >
> > > >
> > > >looks like a mental ray limitation..
> > > >
> > > >I got a transparent glass. (phong) and it has a red opaque sticker
on
> > part
> > > >of it. (lambert)
> > > >I mixed those two, using a mix2colors that is connected to the
surface
> > and
> > > >shadow of the material,
> > > >the phong goes to the base-color, and the lambert goes to color1..
the
> > > >sticker's alpha goes to the wheight
> > > >to determine where on the surfaces, it's a transparent phong, and
> where's
> > > >the opaque lambert..
> > > >
> > > >the problem is with the shadow it casts on the floor..
> > > >If i connect the transparent phong to the Material's shadow, the
shadow
> > is
> > > >coorect for the glass, it is very light
> > > >depending on the thickness of the glass.. but if I connect the
> mix2color
> > > >output to the Material's shadow,
> > > >I expect the shadow to be light and transparent where it's phong, and
> > > >opaque where it's a lambert material..
> > > >but xsi renders all of the shadow opaque...
> > > >
> > > >is this a know bug/limitation? is there a workaround for that?
> > > >
> > > >cheers,
> > > >
> > > >Oz
> > > >www.coolcalb.com
> > >
> > > __ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __
> > > Protect your PC - get McAfee.com VirusScan Online
> > > http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963
> > >
> > > ---
> > > Unsubscribe? Mail Majordomo@(protected) with the following text in
> body:
> > > unsubscribe xsi
> > >
> >
> > ---
> > Unsubscribe? Mail Majordomo@(protected) with the following text in
body:
> > unsubscribe xsi
> >
>
> ---
> Unsubscribe? Mail Majordomo@(protected) with the following text in body:
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>

---
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<!DOCTYPE HTML PUBLIC "-//W3C//DTD HTML 4.0 Transitional//EN">
<HTML><HEAD><TITLE>RE: yet another limitation..</TITLE>
<META http-equiv=Content-Type content="text/html; charset=windows-1255 (See http://ows-1255.ora-code.com)">
<META content="MSHTML 6.00.2800.1276" name=GENERATOR>
<STYLE></STYLE>
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<BODY bgColor=#ffffff>
<DIV>ok.. now i am bit confused...</DIV>
<DIV> </DIV>
<DIV>Francois showed an example which seems
similar
to my render tree setup.. and it works..</DIV>
<DIV> </DIV>
<DIV>i didnt plug the flower into the transperancy of
phong4, because I wanted to have a different material for the
flower..</DIV>
<DIV>at first I even used a lambert node, cause i didnt
want any specular..</DIV>
<DIV>This is just an excersize I gave my intern.. it's
not for a real project... </DIV>
<DIV>I will try the ray_type again, on a new scene..
seems weird it works in Francois's example and not in mine ..</DIV>
<DIV> </DIV>
<DIV>anyway thanks for all who helped!</DIV>
<DIV> </DIV>
<DIV>cheers,</DIV>
<DIV>Oz</DIV>
<DIV><A
href="http://www.coolcalb.com">www.coolcalb.com</A></DIV>
<DIV> </DIV>
<BLOCKQUOTE dir=ltr
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">From:
<A title=hingvars@(protected) href="mailto:hingvars@(protected)">Halfdan
Ingvarsson</A> </DIV>
<DIV style="FONT: 10pt arial">To: <A title=XSI@(protected)
href="mailto:XSI@(protected)">XSI@(protected)</A> </DIV>
<DIV style="FONT: 10pt arial">Sent: Thursday, February 26, 2004 8:03
PM</DIV>
<DIV style="FONT: 10pt arial">Subject: RE: yet another
limitation..</DIV>
<DIV> </DIV>
It's a bit of a bummer. The shadow color is changed as a
side-effect so it will not work with mixing. 
Most shading works by returning a color but shadowing is
different with mental ray as it gives a color which is supposed to get
modified.
Why don't you instead mix the alpha of the flower image with
the transparency input of Phong4? 
- ½ 
-- --Original Message-- -- From:
owner-xsi@(protected) [<A
href="mailto:owner-xsi@(protected)">mailto:owner-xsi@(protected)</A>]On
Behalf Of Oz Adi Sent:
Thursday, 26 February, 2004 12:05 To:
XSI@(protected) Subject: Re: yet another
limitation.. 
I tried using the ray_type node, no luck there either
:) 
here's a few images to show the problem: 
<A
href="http://www.coolcalb.com/~oadi/pix/shadow.jpg">http://www.coolcalb.com/
~oadi/pix/shadow.jpg</A>

it's not for a project, I am teaching an intern, and she
asked
me why the shadow went dark and opaque..
 I still cant figure it up :) 
If I am doing things right, it looks like a mental ray
limitation.. (3.2) or maybe it's my mental limitation
hehe.. 
-- -- Original Message -- -- From:
"Fran?ois Giard" <francois@(protected)> To:
<XSI@(protected)> Sent: Thursday, February 26
,
2004 6:20 PM Subject: Re: yet another
limitation.. 
> Hi Oz, > put a ray type
switch
between your mix2 and shadow input ... > hope this
help > -- -- Original Message -- --
 > From: "Oz Adi" <oz@(protected)>
 > To: <XSI@(protected)> > Sent: Thursday, February 26, 2004 10:58 AM > Subject: Re: yet another limitation.. > > > >
it's already high.. > > > > it's set to 4, and when the transparent phong is connected
directly to the > >
shadow, > > the shadow looks ok, it looks
transparent. when I connect the mix2colors > >
output to the shadow, it seems > > like xsi
dont
know to use the mixed data, to determine where the shadow > > should be opaque and where its transparent. > > (I got an opaque sticker mixed onto the glass model)
 > > > > > > > > -- -- Original Message
-- -- > > From: "Bernard Lebel"
<atyss4si@(protected)> > > To:
<XSI@(protected)> > > Sent: Thursday,
February 26, 2004 5:46 PM > > Subject: RE: yet
another limitation.. > > > > > > > Make sure the
refraction trace depth is high enough (at least 4). > > > > > > > > > Cheers > > >
Bernard > > > >
> > > > > >
> > <A
href="http://www.bernardlebel.com">http://www.bernardlebel.com</A>
 > > > <A
href="http://www.xsimontreal.com">http://www.xsimontreal.com</A>
 > > > <A
href="http://www.xsibase.com">http://www.xsibase.com</A> > > > > > > > > > > > > > > > > > > >From: "Oz
Adi" <oz@(protected)> > > >
>Reply-To: XSI@(protected) > > > >To
:
<XSI@(protected)> > > > >Subject:
yet another limitation.. > > > >Date: Thu
,
26 Feb 2004 16:35:07 +0200 > > > >
 > > > > > > >
>looks like a mental ray limitation.. > >
> > > > > >I got a transparent
glass. (phong) and it has a red  opaque sticker on > > part >
> > >of it. (lambert) > > > >I
mixed those two, using a mix2colors that is connected to the surface > > and > > > >shadow of the material, &gt
;
> > >the phong goes to the base-color, and the lambert goes to
color1.. the > > >
>sticker's alpha goes to the wheight > > &gt
;
>to determine where on the surfaces, it's a transparent phong, and
 > where's > > > >the
opaque lambert.. > > > > > > > >the problem is with the shadow it casts on the
floor.. > > > >If i connect the
transparent phong to the Material's shadow, the shadow > > is > > > >coorect for the glass, it is very light
 > > > >depending on the thickness of the glass..
but if I connect the > mix2color > > > >output to the Material's shadow, > > > >I expect the shadow to be light and transparent
where it's phong, and > > > >opaque where
it's a lambert material.. > > > >but xsi
renders all of the shadow opaque... > > >
> > > > >is this a know bug/limitation
?
is there a workaround for that? > > >
> > > > >cheers, > > > > > > >
>Oz > > > >www.coolcalb.com
 > > > > > >
__ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ ____ __
 > > > Protect your PC - get McAfee.com VirusScan
Online > > > <A
href="http://clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963">http:/
/clinic.mcafee.com/clinic/ibuy/campaign.asp?cid=3963</A>
 > > > > > >
--- > > > Unsubscribe? Mail
Majordomo@(protected) with the following text in > body: > > > unsubscribe
xsi > > > >
> > > --- > >
Unsubscribe? Mail Majordomo@(protected) with the following text in
 body: > > unsubscribe
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