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

Andy Nicholas andy at andynicholas.com
Tue Oct 14 20:48:44 EDT 2008


Hmmm, yep, that sounds like it might well do it. Thanks a lot for that,
I'll give it a go.

Cheers

Andy


> 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
>     r+h
>
>   is this awesome? (y/n)
>
>
>





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