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Just noticed something and got confused...

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Hello Guys.
There's this certain thing I noticed today which puzzles me.

Assumption: We have a poly mesh sphere of rad(x,y,z)=0.5 and an xform node piped to it. Y-axis pivot (py) of the transform node equals .

If I set py=-$SIZEY/2, it places the pivot at the bottom of the sphere, which is correct. But... If I peek at a current value of py (in Parameters pane), it still shows , while it should be equal to -0.5. If I pipe a Python SOP to check the value of SIZEY local variable, it shows me 1.0. So why inside the py parameter?


also returns 0.0 instead of -0.5. So the parameter really stores .

Similarly with xform's ty. If I type $SIZE/2, which levels the bottom of the sphere with the origin on Y-axis, and if I peek at the parameter's value of ty, I get 0.0. Python's eval()also shows that this parameter stores 0.0. But why? Why it's not equal to 0.5?

Could someone please explain this to me? Why does this happen?

Edited by ajz

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Interesting lecture. It pretty much explains everything.

Thank you jkunz07. I thought I was going insane. :)

Edited by ajz

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