Orient geometry to

I want to place geometry on curve and orient each one to a surface normals, i tried many ways but have not any result.
Would be appreciate for help!

surface normal_help.3dm (1.6 MB)
surface normal_help.gh (12.6 KB)

You were close, the evaluate surface requires a UV point not an xyz point. To get this you just need surface closest point in the gap. I then oriented you box using planes, though if its just an object made from a plane input , such as this box this could be build directly off the frame component with no need for the orient component.

Note if you want to orient lots of objects in sets to multiple planes have a look at the group components.

surface normal_help_MG-EDIT.gh (23.5 KB)

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Thank you for the detailed explanation, it’s very helpful!
So i added another one Orient Geometry and through Curve Frames placed geometry align to curve.