[Sidefx-houdini-list] Motion blur with gather()?

jiversen jiversen at rhythm.com
Tue Oct 14 20:47:02 EDT 2008

You can turn on raytracing against motion-blurred objects by adding the 
Rendering Parameter "Raytrace Motion Blur" (vm_traceblur).

Maybe this will help?

Pablo Giménez wrote:
> Mmm, one dirty solution, very dirty I admit, in case you are converting your
> fluid with the PArticle Fluid Surfacer, as I guess, I think you can use th
> Trail SOP to bring the geometry of the previous frame into your current
> frame and then send rays agains both of them, maybe it can work, but I have
> said is a very dirty hack.
> 2008/10/14 Andy Nicholas <andy at andynicholas.com>
>> Hi,
>> Thanks for all the info on making my wetmap shader work! Unfortunately,
>> I've got another related problem that'd be great if I can pick some of
>> your brains on.
>> Since my fluid moves quite quickly it leaves occasional gaps on the
>> wetmap. If I can get it motion blurred, it'll be sorted. Is it possible to
>> somehow detect the motion of the fluid inside the gather loop? Just to be
>> clear, I don't mean picking up the velocity attribute, just that I'd like
>> the gather() samples to realise that they should be stratified over time
>> so that I can average them together to produce the blur.
>> Is it possible to set this up somehow in the shader?
>> Thanks
>> Andy
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jason iversen
  fx supervisor

  is this awesome? (y/n)

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