Arian Sadafi

Hey !
Im new to houdini and I'm learning by some tutorials
in a part of it i need to give thickness to the spoon and i should do it with points node - color gradient ( … –> point –> VOP SOP –> attribpromote –> Polyextrude –> … )
But the gradient is not in the right direction
as you can see its on X axis - left to right

http://www.imagesup.net/?di=014183398989 [imagesup.net]
http://www.imagesup.net/?di=714183400305 [imagesup.net]

but it needs to be like this on the Z axis - up to down

http://www.imagesup.net/?di=814183401143 [imagesup.net]

and sorry if its so simple but i couldn't find out how to do it !