flip normal is not working

Replies to This Discussion

Permalink Reply by patric guenther on February 17, 2014 at 1:43pm

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?

Permalink Reply by patric guenther on February 17, 2014 at 2:00pm

specially for a referenced surface

Permalink Reply by Andrew Heumann on February 17, 2014 at 5:57pm

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. 

Attachments:

• Normals_workaround.gh, 9 KB

Permalink Reply by horst Becker on February 18, 2014 at 2:31am

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

Attachments:

• Normals_workaround.gh, 16 KB

Permalink Reply by Andrew Heumann on February 18, 2014 at 8:19pm

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

Permalink Reply by Andrea Tassera on May 6, 2015 at 10:05am

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!