[Bf-cycles] Ray passing transparent BSDF does not become transmission ray?

[Brecht Van Lommel]

It's an intentional distinction, see more info here:
http://wiki.blender.org/index.php/Doc:2.6/Manual/Render/Cycles/Light_Paths

"The transparent BSDF shader is given special treatment. When a ray
passes through it, light passes straight on, as if there was no
geometry there. The ray type does not change when passing through a
transparent BSDF."


On Thu, Nov 7, 2013 at 4:26 PM, Gottfried Hofmann
<gottfried at blenderdiplom.com> wrote:
> Hello Cycles Team,
>
> recently I noticed that passing a transparent BSDF does not change the
> ray type to transmission ray as it happens with the glass BSDF. Is that
> the intended behaviour?
>
> Here is an example .blend with two planes:
> http://www.pasteall.org/blend/25076
>
> The lower one has a light path node that controls the shader via a mix
> shader node. When the ray is of type transmission, a different emission
> shader is used. This does not work when the top plane is set to
> transparent, only when it is set to glass...
>
> Cheers,
> Gottfried
>
>
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