BrepFace.GetMesh() returns null

[Marcio_Souza]

Hello,

So I was following a discourse post about getting cached meshes from Breps and saw this post from @dale

Brep mesh extraction

Hi @qlabrosse, If you are working from within a RhinoCommon plug-in and you have a Rhino Brep object, then you can use RhinoObject.GetMeshes. If you just have a Brep, or you are using Rhino3dmIo, then you’ll need to iterate through the Brep’s faces and accumulate the meshes from each individual face using BrepFace.GetMesh. Does this help? – Dale

Im working in a Rhino plugin were I need quick access to the mesh representation of my Breps, so I can send them to PostDrawing events. I was using Mesh.CreateFrom Brep but it was showing heavy performance issues.

However my Breps are not hosted in Rhino Objects, and the BrepFaces meshs are returning null, just like spotted in this post

GetMesh() returns Null

Hi guys! I have a problem (small probability that it’s Rhino bug). I have function for export geometry. f3dm = Rhino.FileIO.File3dm.Read(RhinoDocument.Path); foreach (Rhino.FileIO.File3dmObject o in f3dm.Objects) { ExportedObject exportedObject = new ExportedObject(); List<ExportedMesh> eM = new List<ExportedMesh>(); exportedObject.Meshes = eM; //specify if object is solid or passable (door, window). …

There is anyway I can store cached meshes in my Breps that are not part of a Rhino Object?

[John_Brock]

Assigned to Developer category

[dale (Dale Fugier)]

@Marcio_Souza

There is anyway I can store cached meshes in my Breps that are not part of a Rhino Object?

Yes, use BrepFace.SetMesh.

– Dale

[Marcio_Souza]

So Anyway I need to provide a generate mesh right?

What if instead of call DrawMesh I call DrawBrep in my PostDrawing event? This cached mesh behaviour is exposed when I do this or DrawBrep will always force the generation of a new mesh?

[dale (Dale Fugier)]

@Marcio_Souza

So Anyway I need to provide a generate mesh right?

Yes, use Mesh.CreateFromBrep for this. The results will contain a mesh for every Brep face.

@Marcio_Souza

What if instead of call DrawMesh I call DrawBrep in my PostDrawing event? This cached mesh behaviour is exposed when I do this or DrawBrep will always force the generation of a new mesh?

If you want something shaded, then that’s an option. DrawBrep will not generate a mesh for you.

– Dale