[Bf-cycles] Render passes and flat mirrors

Brecht Van Lommel brechtvanlommel at pandora.be
Thu Jan 2 23:33:09 CET 2014

There is indeed no direct way of doing this. I don't know if other
renderers have some way to control this, if the AO and similar pass
work through sharp reflections? I guess that is what custom render
passes could be for, although you'd still have to go into each
material and make them output the pass, so it wouldn't be ideal.

Different materials per render layer are not possible now (except the
single material override for the entire scene). Doing it node or OSL
based would be certainly be possible to implement.

On Thu, Jan 2, 2014 at 8:33 PM, Greg Zaal <gregzzmail at gmail.com> wrote:
> Hey Adriano, everyone,
> You would have to create these custom passes as render layers instead, or
> perhaps in a different scene completely. Either way, you would basically
> create a material for the pass you want (using camera depth, AO shaders,
> solid color emission shaders for IDs...) and assign it to everything, then
> assign a normal glossy shader for the reflective mirrors.
> On a related note, one thing I like in Maya (although it's also the most
> buggy thing I've ever worked with) is the ability to override materials per
> render-layer, meaning an object can have one material assigned to it for one
> layer, and a different one assigned to it for another layer. Is this
> possible in blender currently without duplicating the object or scene?
> If not, is it a feasible idea? It could even be node based, using something
> like the Attribute node as a sort of boolean "Is X Render Layer", like
> mask/matte type of thing.
> Cheers,
> Greg Zaal
> On 2 January 2014 21:02, Adriano Oliveira <adriano.ufrb at gmail.com> wrote:
>> Dears,
>> I have an animation scene in an elevator that has a big flat mirror.
>> Is there any way to Cycles generate render passes for whatever is "inside"
>> the reflection, like Z, AO, ID...
>> Adriano A. Oliveira
>> _______________________________________________
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>> Bf-cycles at blender.org
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