[Sidefx-houdini-list] colour volumes by particles

Ron Schab ron.schab at gmail.com
Mon Jan 22 09:29:20 EST 2018


Lol, ok, let's call it a tie ?!?

Ron Schab
-----------------------------------------------------------------------

http://www.ronthedon.com


US: +1 951-5527104 # 290
CA: +1 778-7830782 #176
       +1 6047101797 (mob)
GER: +49 892-1094212 #772
       +49 (0)1577 - 4096084 (mob)
UK: +44 (0)7511 295510 (mob)
AUS: +61 (0)449 136336 (mob)
NZ: +64 (0)21 0754 597 (mob)
Malaysia:+60 133969400 (mob)

On 22 January 2018 at 15:23, François Duchesneau <houdini at trinix.ca> wrote:

> 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
>> -----------------------------------------------------------------------
>>
>> http://www.ronthedon.com
>>
>>
>> US: +1 951-5527104 # 290
>> CA: +1 778-7830782 #176
>>         +1 6047101797 (mob)
>> GER: +49 892-1094212 #772
>>         +49 (0)1577 - 4096084 (mob)
>> UK: +44 (0)7511 295510 (mob)
>> AUS: +61 (0)449 136336 (mob)
>> NZ: +64 (0)21 0754 597 (mob)
>> Malaysia:+60 133969400 (mob)
>>
>> 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
>>>
>>>
>>> US: +1 951-5527104 <(951)%20552-7104> # 290
>>> CA: +1 778-7830782 #176 <(778)%20783-0782>
>>>         +1 6047101797 <(604)%20710-1797> (mob)
>>> GER: +49 892-1094212 #772 <+49%2089%2021094212>
>>>         +49 (0)1577 - 4096084 <+49%201577%204096084> (mob)
>>> UK: +44 (0)7511 295510 <+44%207511%20295510> (mob)
>>> AUS: +61 (0)449 136336 <+61%20449%20136%20336> (mob)
>>> NZ: +64 (0)21 0754 597 (mob)
>>> Malaysia:+60 133969400 <+60%2013-396%209400> (mob)
>>>
>>>
>>> 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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>>>> http://www.avg.com
>>>>
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>>>>
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