[Sidefx-houdini-list] ray sop fetching attribute values that dont exist.

Robert Kelly isstuff at gmail.com
Mon Feb 1 19:13:55 EST 2010


i am using 1 ray and the shortest ray, i was using rays 4 and shortest
ray but changed that to prevent any chance of mixing.

On 1 February 2010 14:48, Andrew D Lyons <tstexture at gmail.com> wrote:
> How many samples are you using? Are you using "average Ray" as the
> combiner?You may be averaging multiple samples to get 0.
>
> If you play with some of those settings you may get more desirable
> results. ie. 5 samples and "longest ray".
>
> Cheers
>
> On 1 February 2010 14:39, Robert Kelly <isstuff at gmail.com> wrote:
>> I am wondering if the ray sop can be trusted....
>>
>> I have a ray sop fetching attributes from some geometry but sometimes
>> it returns values that are not there to be returned.
>>
>> I have an int attribute called curve and it is on 7 tubes the
>> attribute goes from 1 to 7 according to the curve that each tube was
>> made from. The value is never zero. so i take that geometry append a
>> attributeCreate set the curve int value to -1. I put it into the first
>> input of a ray sop and the geometry before the attributeCreate into
>> the second input; I set the bias so it dosen't just get the same point
>> it came from... i set the ray sop to return the curve attribute that
>> it hits and the dist value.
>>
>> So i am getting Zero for some of the curve attributes, there are
>> plenty of -1 values for all the points that miss, and some values from
>> 1-7 for others that hit but some have 0 as the value. What could cause
>> this?
>>
>> Any ideas?
>> Robert Kelly
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>
>
>
> --
> =======================================
> Andrew D Lyons | Digital Artist | http://www.tstex.com
> =======================================
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