[Sidefx-houdini-list] colour volumes by particles

Ron Schab ron.schab at gmail.com
Mon Jan 22 09:19:48 EST 2018


D'ooh ... Francoise beat me to it


Ron Schab
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On 22 January 2018 at 15:19, Ron Schab <ron.schab at gmail.com> wrote:

> Hey Gerbrand,
>
> sounds like you are almost there.
> Instead of using three volume vops (which of course run through the pc
> open three times) u can do it all in one V-Vop.
>
> Before the Vop you will need to create three volumes named Cd.x, Cd.y and
> Cd.z (you could do that with three NameSOPs, that you merge back in with
> your initial density volume).
> Then in ur VolumeVOP use ur PCOpen and PCFilter as it sounds like you have
> already set it up and bind export that to CD.
> Then you just call that in your volume shader (most - if not all - of the
> volume shaders that ship with Houdini are set up to do so already)
>
> hope that makes sense?
>
> cheers
> Ron
>
>
>
> Ron Schab
> -----------------------------------------------------------------------
>
> http://www.ronthedon.com
>
>
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> On 22 January 2018 at 14:54, Gerbrand Nel <g at cannonballbunny.com> wrote:
>
>> Hey guys
>> For some reason I find this much harder than I think it should be.
>> I would like to colour a volume based on the colour of the points inside
>> the volume.
>> In my head I should just run this through a attribute transfer, and maybe
>> a attribute blur.
>> This however only works in my head... -_-
>>
>> I made a setup that kinda works, but it's slow as hell.
>> In this setup I create 3 volume vops. in each one I use a pcopen to read
>> my colors on the points, and multiply the R, G and B with the density of
>> the volume.
>> I now sit with 3 volume that I put a red, green and blue shader on.
>> Like I said, this works, but its slow, and wrong and bad and I'm ashamed
>> :)
>>
>> How to in real life?
>> Thanks guys
>> Gerbrand
>>
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