Offset a brep in Grasshopper

[M_Thorez (Maxime Thorez)]

Hi all,

I’m trying to offset an open polysurface in grasshopper, but the software tells me it is unable to convert a brep into a surface

yet, if I bake the said polysurface and then use _Offsetsurface in regular rhino, it works just fine (see “expected result”)

is there a way to convert a brep in a polysurface in grasshopper (considering all faces are planar, or at least are supposed to be), and if not, how may I proceed otherwise?

thank you in advance

bre-offset-gh.gh (9.1 KB)

offset-brep-rhino.3dm (7.6 MB)

[jessesn (Jessesn Chen)]

@M_Thorez

is there a way to convert a brep in a polysurface in grasshopper (considering all faces are planar, or at least are supposed to be), and if not, how may I proceed otherwise?

Please try to use GhPython to call OffsetBrep in Rhinocommon achieving it, and for your reference.

bre-offset-gh.gh (26.3 KB)

[inno]

the reason why the Brep is still open after the Offset can be found in the center surfaces, and it’s unrelated to the Brep Offset operation:

There’s a problem with the central surfaces, the ones you initially merge, probably the common central vertex does not lie (XY wise) on the polar rotation plane

[M_Thorez (Maxime Thorez)]

Hi

Thank you for your help,

but in my rhino, the Python component is declared as “old”, is it an issue?

[M_Thorez (Maxime Thorez)]

my issue was not the brep being open, but I did notice the gap afterwars

it was due to an imprecision in the defining surfaces and has been fixed since

thank you for your help

[jessesn (Jessesn Chen)]

@M_Thorez

but in my rhino, the Python component is declared as “old”, is it an issue?

Yes, you are right, it’s a old GhPython component and It’s not an issue.