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

[Gottfried Hofmann]

On 11/07/2013 06:06 PM, Brecht Van Lommel wrote:
> 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."

Thank you for the clarification!

Cheers,
Gottfried

>
>
> 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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