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remove the attribute by VEX

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I'm not sure it really makes sense to do that.  VOPSOPs and AttribVOPs iterate over each point/component... meaning you'd be attempting to "remove" an attribute from each one individually.  But that's not the way Houdini works - if you set an attribute on a single point, all the other points are automatically and immediately initialized to zero for the same attribute, as you can't have an attribute exist only on certain points but not others.


I'm not sure if there's a way besides the Attribute SOP... it's probably something Python-able.

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