Offset and create one Brep?

[kieganlenihan]

I want to turn the brep in the gh file into a single closed brep. I try using Solid Union which works, but is not always reliable. Sometimes, the Solid Union creates an open Brep. I want a consistent method for getting a single closed Brep from a given 2D open Brep (surface) as can be seen in the gh file. OffsetProblem.gh (420.7 KB)

[wim (Wim Dekeyser)]

Hi - I don’t have Pufferfish installed and can’t comment much on this file…
Just some general observations:

@kieganlenihan

I want a consistent method for getting a single closed Brep from a given 2D open Brep (surface)

Are you strictly speaking of surfaces in one plane? Your internalized geometry in that definition surely is something else.

What happens in a Boolean operation when you are using open polysurfaces depends entirely on the direction of the objects.

I see that you have a very similar thread going on here:

Offset with pufferfish

I am using the offset surface function in Pufferfish to create a solid. I want the offset surface to be larger (always) before the solid is created, but sometimes the function extrudes the surface inside as shown below: [Screen Shot 2020-02-25 at 9.38.34 AM] Versus the correct method below [Screen Shot 2020-02-25 at 9.37.49 AM] When I change something in the base mesh (of which this geometry is derived), the offset distance randomly goes internally or externally, forcing me to manually nega…

-wim

[kieganlenihan]

No none of the surfaces I will be using are planar.

[kieganlenihan]

So I am trying a new method in RhinoCommon which is Brep.CreateOffsetBrep. I think this is what I am looking for, since I want to offset a Brep, not a surface. However the syntax is confusing me in python and I get the error “Data conversion failed from Goo to Brep”. Any ideas? @Michael_Pryor
OffsetProblem.gh (308.4 KB)

[Michael_Pryor (ekim)]

Use Parakeet offset Brep component. Requires Rhino 6.

[anon39580149]

Try this
Offset Brep.ghpy (30 KB)