[Bf-committers] Cycles velocity

Manuel Rais manu at g-lul.com
Thu Oct 22 11:41:13 CEST 2015

Hi Sergey

Thanks for your answer. 

To be more clear, we want to use this attribute to switch from a texture to another when the velocity is not null. 
The purpose is to have a stop motion rendering with displace/bump changing only on the moving parts. 
Of course there's many ways to achieve this but we're searching the more automatic. We have others ideas of course but less funny ☺.. 

All objects in this project are baked in pc2 files and are at the center of the world and their scale at 1. So I guess the world space and object space are the same,  but maybe I'm wrong. 
I know a little bit of c/cpp maybe I can  produce a patch (with a little help?) if it's not too hard... 


Le 21 octobre 2015 23:58:56 GMT+02:00, Sergey Sharybin <sergey.vfx at gmail.com> a écrit :
>What is the use of such attribute?
>Also, due to instancing it's quite tricky to represent word-space
>in the vertex attribute, only object space velocity is possible to be
>stored without major PITA.
>On Wed, Oct 21, 2015 at 8:07 PM, Manuel Rais <manu at g-lul.com> wrote:
>> Hi !
>> I was wondering if it's possible to have vertex velocity in the
>> node of Cycles.
>> Cycles outputs velocity in the "Vector" pass, it renders motion blur
>> (object and deformation), so I guess that this attribute exists
>> Am I wrong ?
>> Is it possible to add it in the output of the attribute node ? Is it
>> nightmare ?
>> Thanks.
>> ---
>> Manuel Rais
>> Autour de Minuit
>> manu at g-lul.com (mailto:manu at g-lul.com)
>> _______________________________________________
>> Bf-committers mailing list
>> Bf-committers at blender.org
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>With best regards, Sergey Sharybin

Manuel Rais
manu at g-lul.com
+33 (0)6 62 29 80 86

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