[Bf-cycles] Render passes and flat mirrors

[David Fenner]

About the different material override per render layer, it is sort of
possible, but a far from optimal. What you can do is copy all the node
trees you want into a single material and separate those node trees by
object index through a mix shader. You can also do it by uv attribute, or
vertex color, maybe some other way too. This is the way I do a multimatte
material (anti-aliased object buffers, cause current are no good), by using
emmision shaders mixed by object index applied in the material override,
and having no bounces (sadly a new scene is needed for this). This way you
can get color buffers (RGB) with good anti-aliasing. Another cumbersome
thing is having transparency, cause you have to copy your transparency
settings from your shaders (like leaves) to be mixed again by object index
in this "super-multimatte-shader" that separates settings for every object
although being only one material. Is sort of a way to make a per object
material override but by using a single material. It would be really great
though if there was some automatic way that render layer material override
wouldn't override transparency settings (or displacement in the future),
this way it would be much easier to set up custom passes, since you could
just mix your shaders with object index.


2014/1/2 Adriano Oliveira <adriano.ufrb at gmail.com>

> Yes Greg, this is the way I was going already.
> Not that difficult, but boring.
>
> ;)
>
> Adriano A. Oliveira
>
>
> 2014/1/2 Greg Zaal <gregzzmail at gmail.com>
>
>> 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
>>>
>>> _______________________________________________
>>> Bf-cycles mailing list
>>> Bf-cycles at blender.org
>>> http://lists.blender.org/mailman/listinfo/bf-cycles
>>>
>>>
>>
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>
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