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how can I use @tangentu in vex?

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I draw bezier curve and added polyframe node to get tangentu attribute, But I could not use @tangentu  like @N in vex.

Can I ask why "f@a=@N.y;" is ok but "f@a=@tangentu.y;
is not ok?



スクリーンショット 2024-04-12 162744.png

Edited by katosa
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