RC: Evaluate Surface

@Dmitriy wrote:

Hi,

I need to evaluate normal at (u,v) coordinates for surface. I am using Surface.NormalAt().
However I noticed that direction of the Normal is not changing when ‘flipping’ surface via normal Rhino Command ‘Direction’.
Any hint how to correlate direction of the Normal with direction shown via ‘Direction’ command in Rhino?

Thanks,
Dmitriy

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