gh is flipping surface normals!?

i have an open brep with all normals orientated outwards.
if i look at the normals in gh some are flipped, if i bake the geometry they come back to
their original orientation!???

anyone had similar problems? any workaround?

best, quirin

Replies to This Discussion

Permalink Reply by David Rutten on November 13, 2009 at 11:50am

Hi Quirin,

Normally the normals on a surface are the direct result of the layout of the control-point grid. However, Breps have little flags on each face that might say: "flip the normals!". When you flip a surface is might not actually change the surface at all, it just updates the flag. I need to pay attention to these flags when I evaluate normals in Grasshopper, which I'm currently not.

--
David Rutten
david@mcneel.com
Poprad, Slovakia

Permalink Reply by quirin krumbholz on November 16, 2009 at 2:38am

hi david

thanks for your reply!

i figured out that swapping the uv-direction manually for some surfaces is giving me the
proper normal direction in GH which makes sense concerning the control-point layout for
the surface. maybe it would be possible to implement a swapUV node in GH too!?

best, quirin

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