[Sidefx-houdini-list] colour volumes by particles

François Duchesneau houdini at trinix.ca
Mon Jan 22 09:23:25 EST 2018


That's why I answer with half the answer, too make sure I'm the first ;P

However, I had answered back by mistake to his personal email instead of 
the list and he asked me clarification on how to create those fields, so 
I'd say you beat me :)

On 01/22/2018 09:19 AM, Ron Schab wrote:
> 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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>>
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