Final Gathering and transparency 2004-03-10 - By Jeff McFall
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Here is a script which illustrates the effect I am seeing
Run this script then select the smaller grid and adjust its transparency from 0
to 100%
You will notice that it leaves a shadow even though it is completely transparent
CreateImageBasedLightingPass "Pictures\noIcon.pic"
CreatePrim "Grid", "MeshSurface"
SetValue "grid.grid.ulength", 30
SetValue "grid.grid.vlength", 30
ApplyShader "Lambert", , , , siLetLocalMaterialsOverlap
CreatePrim "Grid", "MeshSurface"
SetValue "grid1.grid.ulength", 4
SetValue "grid1.grid.vlength", 4
ApplyShader "Material\Constant", , , , siLetLocalMaterialsOverlap
SelectObj "Camera"
ToggleVisibility
Translate , 0, 20, 0, siAbsolute, siParent, siObj, siY
SelectObj "grid1", , True
Translate , 0, 2, 0, siAbsolute, siParent, siObj, siY
InspectObj "Passes.HDRI", "General", , 1
SetValue "Passes.HDRI.Environment.background_intensity", 0
SetValue "Passes.HDRI.Environment.fg_intensity", 0.35
jeff
-- --Original Message-- --
From: Jim Rothrock [mailto:jimr@(protected)]
Sent: Wednesday, March 10, 2004 1:13 PM
To: XSI@(protected)
Subject: Re: Final Gathering and transparency
-- -- Original Message -- --
From: "Jeff McFall" <Jeff.McFall@(protected)>
> Ive got several constant shaded objects that I am animating
> transparency
on in a scene that uses final
> gathering.
>
> When these objects are 100% transparent they still create "shadows".
> The
only way I have found to
> remove these shadows is to turn secondary rays off. Removing
> secondary
rays has the unwanted effect
> of removing the objects light emitting ability when the objects are
opaque.
What is the value of the "scanline" option when you are rendering: on, off, or
rapid? Are you using a custom material shader on the transparent objects, or
one that is supplied with XSI? What are your trace depth settings?
--
Jim Rothrock | jimr@(protected)
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