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

Brecht Van Lommel brechtvanlommel at pandora.be
Thu Nov 7 18:06:28 CET 2013

It's an intentional distinction, see more info here:

"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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