[Sidefx-houdini-list] colour volumes by particles

François Duchesneau houdini at trinix.ca
Tue Jan 23 08:16:19 EST 2018


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On 01/23/2018 02:51 AM, Gerbrand Nel wrote:
> Thanks guys!!
> You are both winners in my book
> Do you know how I would render this through redshift though?
> It doesn’t seem to have a place to hook Cd in.
> I'm also not entirely sure if I'm doing it right. would any of you 
> mind taking a look at my tree?
> Thanks
> Gerbrand
> On 2018/01/22 16:29, Ron Schab wrote:
>> 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
>>>>>>
>>>>>> ---
>>>>>> This email has been checked for viruses by AVG.
>>>>>> http://www.avg.com
>>>>>>
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>>>>>>
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