[Sidefx-houdini-list] colour volumes by particles

Gerbrand Nel g at cannonballbunny.com
Tue Jan 23 09:31:05 EST 2018


Well I'm at that point where you give up because you are just too 
embarrassed to ask more questions after people explained everything 
thoroughly.
I tried the name sop, but it doesn't seem to work, or I just have no 
idea how to visualize it.

G

On 2018/01/23 16:02, François Duchesneau wrote:
> Even if Redshift doesn't work with a Cd attribute and does work with 3 
> separate volumes, you should do the point cloud operation in one vop 
> on the Cd volume and then spit it out into 3 volumes for Redshift if 
> needed. Your processing will probably be 3 times faster.
>
> On 01/23/2018 08:24 AM, Gerbrand Nel wrote:
>> Yeah, I wasn't going to just send files to private addresses before 
>> asking.
>> I do get the feeling that redshift will probably not allow me to 
>> render it with a cd attribute.
>> I might be stuck on my 3 vop solution..
>> Man its slow though :(
>> G
>> On 2018/01/23 15:16, François Duchesneau wrote:
>>> The mailing list doesn't accept attachment.
>>>
>>> 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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