yet another limitation..

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yet another limitation..

yet another limitation..

2004-02-26 - By Halfdan Ingvarsson

Back

Reply: 1 2 3 4 5 6 7 8 9 10 >>

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:
> unsubscribe xsi
>

---
Unsubscribe? Mail Majordomo@(protected) with the following text in body:
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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)
.com>

 > > 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)
.co.il>

 > > > >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

 > > > <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
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 body:

 > > unsubscribe xsi

 > >

 >

 > ---

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 >


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