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Point normals on a Curve

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I did the rule of thumb mistake, I did not write down my notes..Does anyone know the expression to rotate the normals on a curve in to complete 360. So far, In POINT SOP Im using in the $NX parameter,cos(360/$NPT)*$PT..something along those lines, and use of sin in the $NZ parameter. To keep things simple im tring this with only four points. Representing each 90 degrees..



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