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change color by spline ramp

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Hi 

I am trying to do this old POP tutorial, there is a section where he takes the red color value and modulates it with a spline ramp. (around the 4 mins mark)  For some reason I cant recreate this at all.  He is using a VOP sop and I am recreating it in an attribute vop , i think that should work fine . when i connect my ramp it just removes all the color.

 

Thanks

 

 

https://vimeo.com/95644892

5b3a0c0423343_splinehoudini.PNG.c7b2a766a0480e30f21b04eba4c05ebe.PNG

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Thank you,  I dont quite understand why, but if the ramp is being adjusted in the geometry level it works.

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