[Sidefx-houdini-list] furry holidays

Dragos Stefan ds_list at dsg.ro
Mon Jan 7 02:46:15 EST 2008


Such great material for some Old School Blog posts... :)

Dragos

Dragos Stefan
creative partner
DSG: visual effects & 3D animation
+4 0723 248937
dragos.stefan at dsg.ro
www.dsg.ro

jeff at sidefx.com wrote:
> And a bit more info.
> 
> The default Fur Procedural (added in the Material as a Mantra Fur
> Procedural SHOP) will use a cvex shader in the manner described below: It
> passes in each point of each procedurally generated curve so you can work
> on it.
> 
> As for writing the actual cvex shader, I either use VOPs (for quick and
> dirty) or write one with vex code and compile in the SOP context. I use
> the SOP context and test on actual curve geometry in SOPs. The exact same
> thing is happening at render time. Even more technical, writing a Mantra
> procedural (with c++) uses the same code constructs as that for SOPs. When
> dealing with Mantra procedurals, I treat it as SOPs.
> 
> With that now understood, you can create your SOP VOP network, test and
> approve on the resultant curves from a Fur SOP. The Mantra Fur Procedural
> generates the identical curves just millions of them if you want. ;)
> 
> Next write the SOP vop code to disk. In the line that says "surface",
> change that to "cvex". Now compile on the command line with
> 
>     vcc my_fur_cvex.vfl
> 
> This will compile a cvex shader. If you are on Windows, please use Wordpad
> to edit the .vfl file generated from the SOP VOP network. Textpad adds
> 1970's DOS return characters. I prefer vim and you should seriously look
> in to cream as your next text editor (built on vim).
> 
> Now all that is left to do is to reference this cvex shader in the Mantra
> Fur Procedural SHOP in your fur Material.
> 
> 
> -jeff
> 
>> ok I will
>> thanks
>> z
>>
>> On Dec 30, 2007 12:47 AM, Andrew D Lyons <tstexture at gmail.com> wrote:
>>
>>> Try the H9 alpha forum...
>>>
>>> Cheers
>>>
>>> On 29/12/2007, zoran arizanovic <zoran.arizanovic at gmail.com> wrote:
>>>> thanks francois!
>>>> I havent found much either on odforce or in docs
>>>> z
>>>>
>>>> On Dec 29, 2007 3:20 PM, François Duchesneau <sidefx at trinix.ca> wrote:
>>>>
>>>>> I've haven't played with cvex really but here's what I know about
>>> it,
>>>>> hoping I'm not saying things wrong.
>>>>>
>>>>> You write your shader to give some frizz or whatever effect to your
>>> fur.
>>>>> Otherwise each fur simply interpolate from each guide fur on the
>>>>> primitive vertices. There's a unique number attribute per
>>> instantiated
>>>>> fur to help you create random function. You can also create and
>>> paint
>>>>> your own custom attribute and use them in the fur shader to control
>>> the
>>>>> intensitiy of whatever look you give to your fur.
>>>>>
>>>>> So basically the global shape of the fur is controlled from the
>>> guide
>>>>> curves and all the rest is in the shader. I wonder if there are not
>>> new
>>>>> tools of higher level in H9.1?
>>>>>
>>>>> Hope this help anyway!
>>>>>
>>>>> François
>>>>>
>>>>> zoran arizanovic wrote:
>>>>>> Hi
>>>>>> i have some time finnaly to look more into fur in h9
>>>>>> I am having troubles with it
>>>>>> could someone explain me about these cvex shaders
>>>>>> how do i create them and for what should I use them
>>>>>> thanks
>>>>>> and all the best to all on the list in 2008!
>>>>>>
>>>>> _______________________________________________
>>>>> Sidefx-houdini-list mailing list
>>>>> Sidefx-houdini-list at sidefx.com
>>>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>>
>>>>
>>>>
>>>> --
>>>> Zoran Arizanovic
>>>> http://arizanovic.blogspot.com/
>>>> _______________________________________________
>>>> Sidefx-houdini-list mailing list
>>>> Sidefx-houdini-list at sidefx.com
>>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>>
>>>
>>> --
>>> ======================================> Andrew D Lyons | Digital Artist
>>> | http://www.tstex.com
>>> ======================================>
>>> _______________________________________________
>>> Sidefx-houdini-list mailing list
>>> Sidefx-houdini-list at sidefx.com
>>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>>
>>
>>
>> --
>> Zoran Arizanovic
>> http://arizanovic.blogspot.com/
>> _______________________________________________
>> Sidefx-houdini-list mailing list
>> Sidefx-houdini-list at sidefx.com
>> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
>>
> 
> 
> _______________________________________________
> Sidefx-houdini-list mailing list
> Sidefx-houdini-list at sidefx.com
> https://lists.sidefx.com:443/mailman/listinfo/sidefx-houdini-list
> 



More information about the Sidefx-houdini-list mailing list