 | | | shadow pass? _sc | shadow pass? _sc 2005-03-19 - By Guillaume Laforge
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> im sure you all know the hard edge you get with the shadow shader at the
> edges of an object where its surface becomes parallel to a light ray,
Sorry but I never notice this hard edge ? Can you show some examples ?
> I would prefer not to do this? is there any way to get the incidence
> (surface_lightlist) to not take light intensity or shadows into account? I
> just want it to be white perpendicular to the light and black when
> parallel
If you plug directly the incidence in the surface material input, the light
is only used to drive incidence on your material ( The light intensity and
shadow is ignored )
Use the 180 degree shading range in the incidence shader and reduce the Bias
to somthing near 0.1 for black color in parallel.
Cheers,
Guillaume Laforge
CG artist
www.vol2nuit.fr
-- -- Original Message -- --
From: "Sam Cuttriss" <samc@(protected)>
To: <XSI@(protected)>
Sent: Friday, March 18, 2005 10:26 PM
Subject: shadow pass? _sc
> im having an issue an issue with shadow passes.
> im sure you all know the hard edge you get with the shadow shader at the
> edges of an object where its surface becomes parallel to a light ray, its
> makes compositing shadows an ugly affair.
>
> to overcome this ive been rendering another pass with an incidence
> (surface_ light list, shadows off) and multiplying my shadow pass with
> this.
> I would prefer not to do this? is there any way to get the incidence
> (surface_lightlist) to not take light intensity or shadows into account? I
> just want it to be white perpendicular to the light and black when
> parallel.
>
>
>
> another question, is there any way to make a material clip shadows?
>
> ie say i was rotoscoping a shadow of a cube onto a onto a real sphere and
> table.
>
> i have a cube floating above a stand in sphere on a table in my 3d scene,
> the shadow of the cube falls across the sphere and the table.
> i want the sphere to eliminate the shadow of the cube on the table.
>
> any ideas?
> if the two of these were solvable 3 passes would become a far cleaner and
> more manageable 1.
>
> thanks all
> have a good weekend.
> _sam
>
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