ISO clarification re: outTransparency 2003-12-08 - By Vovka
Back
You misunderstood some concept behing Shading Group node.
It`s inherited from Maya Set node. It a connection between Surfaces and
actual Shading hodes.
It Just tells Maya software render : render this suface using This surface
shader, this displasement shader, .. may be some Mental ray shaders... etc.
As I understood, u need to reread some rendering concepts.
There is no magic at all.
Hope this will help.
-- -- Original Message -- --
From: "Mike Mcaulay" <mmcaulay@(protected)>
To: <maya-dev@(protected)>
Sent: Monday, December 08, 2003 7:19 AM
Subject: ISO clarification re: outTransparency
> There's something about the outTransparency attribute of shaders that I
> don't understand. It appears that it affects the transparency of target
> meshes even though it is not explicitly connected to an attribute on the
> shadingGroup. For example, if I apply the default lambert1 shader to a
> piece of test geometry and drag the Transparency slider back and forth,
the
> geometry's transparency is affected. But if I go into the Hypershade
window
> the only connection I see is lambert1.outColor ->
> initialShadingGroup.surfaceShader. And if I look in the Connection Editor
I
> see that the OutTransparency attribute is not in fact connected to any
> attribute on the shading group (indeed, there does not appear to be a
> reasonable candidate attribute to which it could be connected).
>
>
> The docs for the ShadingEngine node (aka shading group) state that "the
> renderer will evaluate the "outColor" and "outTransparency" attributes of
> the shader attached to the surface shader port to determine the color and
> transparency of the objects, respectively." So, I guess that means that
> outTransparency is somehow "magical," and takes effect even when it is not
> connected.
>
>
>
> My questions are: 1) Am I understanding this correctly? 2) Where does the
> magic reside? Does the shading group node traverse upstream to the shader
> and query its outTranparency attribute, or does some piece of internal
Maya
> code do it?. And finally, 3) what other attributes are similarly magical?
>
>
>
> I am fairly new to Maya coding, and I was just getting comfortable with
the
> notion that I could rely on Maya's tools (hypergraph, hypershader, etc.)
to
> tell me what was going on. But now it seems that - in at least one case -
> there is some extra voodoo that has to be accounted for.
>
>
>
> Thanks in advance to anyone who can shed light on this subject.
>
>
>
> Mike
>
>
>
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