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node selection

node selection

node selection

(OP)
hi
I am looking for a systematic way to select nodes in my model for creating boundary conditions. I have a cube like 3D structure that is 10 mm high and I wish to select the nodes 0.5mm from the top surface. The structure on the top is irregular so I cant use the "by angle" method. And I find that selecting them individually with the cursur (drawing a rectangle with model parallel in viewport) is not very systematic.

I was wondering if there was an alternative way
thanks a lot
conor

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