[Sidefx-houdini-list] random UV transform

Larry Giunta larry at gcreativestudios.com
Tue Jul 26 09:05:56 EDT 2011


Thanks Rangi .... I'll give it a go.




On Jul 25, 2011, at 7:28 PM, Rangi Sutton wrote:

> On 26 July 2011 08:34, Larry Giunta <larry at gcreativestudios.com>  
> wrote:
>> Hello all,
>>
>> I have a grid that is made up of various sized rectangles ( just  
>> dissolved a
>> handful of edges to make that).
>>
>> I then made the points unique so the grid could deconstruct and the
>> rectangles could fly off in different direction.
>>
>> I also need a texture map to run across the grid so it appears as  
>> a solid
>> image when the grid is together.
>> Easy enough with a UV texture and appropriate material applied.
>>
>> However, I need to randomize the scale of the UV's sightly from  
>> primitive to
>> primitive so the textured image
>> appears to be magnified somewhat differently from rectangle to  
>> rectangle.
>>
>> I have been trying to use some random expressions in the UV  
>> transform's
>> scale parameters multiplied by $PR,
>> but I seem to be getting a uniform transform across the entire  
>> grid ... not
>> slight variations from primitive to primitive
>> as I expected.
>>
>> Am I just looking at the wrong SOP??? or maybe I should be think  
>> about a
>> different approach to writing this random expression??
>>
>> Any other thoughts on how I might slightly randomize the UV scale  
>> from
>> primitive to primitive across a grid with unique points??
>
>
> Simply way might be to ...
>
> * Copy the UVs to Position with a point sop (vops for flavour)
> * Use primitive sop to scale your prims.. or any sop that floats  
> your boat
> * Copy positions back to UVs of your original geo.
>
> Usually there's steps in there for making points unique and fusing
> them again and stuff... but you've got unique points already so it's
> all easies.
>
> Beers,
> r.
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