Grasshopper

algorithmic modeling for Rhino

when I flip the input surface, the normal vector of the surface keeps still in the same direction. what am I doing wrong?

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I have the same problem with the newest gh version. the "flip surface" component is not working.

could that be a bug? someone with the same problem?

specially for a referenced surface

The problem is actually not with flip surface - the problem is that the Evaluate Surface component is looking at Surface normals instead of Brep normals (the way it used to.) This is definitely a bug in a recent version... 

See the attached definition with a workaround, which grabs the Brep normals with a script. 

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but I don´t think that the problem is just the "Evaluate Surafce" component, because after fliping the surfaces I still get the wrong vectors by using the z output by the "deconstruct plane" component, see attached definition and image

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presumably the auto-conversion from srf to plane relies on Surface rather than Brep geometry as well.

It looks like the problem is on referenced surfaces.

I found a way to bypass this issue by putting in the middle between the referenced surface and the flip command the Deconstruct Brep command and taking the faces (that are now "untrimmed surfaces") from that. And now it works!

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