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bodapota
11-29-2009, 09:00 AM
Hello,

I was trying to use goalU condition on the particle,
like : if (goalU < .5)
and then I found the particle doesnt respond correctly as expected.
later I found out it's the primitive nurbs obj I created has UV value higher than one,

for example, it's a cylinder and has 20 span on U, and the max U value will be 20 instead of 1,
That's really a big conflict again what I have known before.
Shouldn't the UV value of nurbs always fall between 0 and 1??
Well at least it's what it looks like in the UV editor.

So I think I must have missed some knowledge here...
Could someone fill me up please?
Thanks!
(im using 2010)
http://www.digitaltutors.com/forum/images/misc/progress.gif

wallabee
11-30-2009, 12:05 AM
Surfaces -> Rebuild Surface

Make sure parameter range is "0 to 1", and I usually set the U and V spans to what I originally built the surface as.

hkspowers
11-30-2009, 12:05 AM
EDIT: Sorry I did not see your post Ben. Here is the option box anyway. lol

http://forums.cgsociety.org/attachment.php?attachmentid=148677&stc=1

bodapota
11-30-2009, 01:25 AM
Thanks so much for replies :D
I figured that rebuilding the surface can fix the problem.
But something remains mysterious to me.
Please check the Nrubs Surface history under the nurbs shape node,
There are Min Max UV range, they are greater than 1,
so if you dont rebuild it, goalUV can only cover partially.
but at the same time the UV texture range is still from 0 to 1,
like if you apply a texture, it covers the whole obj,

it seems that they are different spaces?
So goalUV or parentUV take the former as ref space?
And so one is considered as obj UV, the other texture UV? Is that true?
That's confusing,
What is that Min Max UV range useful to anyway??
Thanks !!

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