Importing CAD (stl or stp) and creating a BREP object for Energy Plus Simulation

grasshopper ladybug-legacy
1

Hello,

I have a stp or a Brep from a CAD software that I want to create EP simulations for.

Steps:

  1. Import the attached file onto Rhino (either stp or stl) both are same

  2. Run Grasshopper command in Rhino

  3. Drop LadyBug_LadyBug and HoneyBee_HoneyBee onto GH canvas

Now, hit F4 on grasshopper and create Brep Object

I don’t see my 2 volumes, I see these messages on the Brep:

Empty Brep parameter

  1. Floating parameter Brep failed to collect data

I’m sure these is something simple missing in my workflow. Please guide. Thanks.

2

I’m trying to get my own geometry: following Chris’s example here: https://www.youtube.com/watch?v=s3RbnWlsLmI&t=196s (4min 36 secs) (Video) 1 - Honeybee Energy Modeling - Installation )

3

stl and stp file are meshes sowhen you open them in Rhino the will come as meshes. You can use ‘MeshtoNurbs’ and ‘MergeAllFaces’ commands to convert them to clean polysurfaces.

4

Thanks Mostapha. stp is geometry - OpenCascade, stl is mesh file format. Anyways.

What are the geometry files format that would work without a problem, imported from other standard CAD packages?

Attaching the lpt.stp (OpenCascade Geometry) that I want to work with.

Here is the log of MeshToNURB and MergeAllFaces on the attached file

Command: MeshToNURB
Select polygon meshes to convert to NURBS ( TrimTriangularFaces=Yes ):
3 polysurfaces added to selection.
Command: MeshToNURB
Select polygon meshes to convert to NURBS ( TrimTriangularFaces=Yes ):
Select polygon meshes to convert to NURBS ( TrimTriangularFaces=Yes ):
Command: MergeAllFaces
Select a Polysurface:
Select a Polysurface. Press Enter when done:
Unable to move edges within face tolerance, nothing done
Unable to move edges within face tolerance, nothing done
Unable to move edges within face tolerance, nothing done
Unable to move edges within face tolerance, nothing done

Merged 1 polysurface. 2 polysurfaces could not be merged further.
Command: MergeAllFaces

I want to see 3 volumes from this file in the Brep object.

Many thanks.

lpt.stp (244 KB)

5

Sorry for the false alarm. Ok, I found out that I wasn’t adding them manually. Thanks.