Hello, I’m trying to create some brep geometries and am running into a wall. I tried Brep.from_polygons which gave me a ‘plugin not installed’ error in rhino/GH. I would use Brep.from_brepfaces but I don’t see any way to generate a BrepFace from boundary curves. I tried the Brep.from_mesh, which worked, but the triangulation of the mesh faces gave unusable brep geometry (see image).
Any ideas for how to generate this Brep?
EDIT: Brep.from_curves also returns a ‘plugin not installed’ error.
hi oliver,
the “plugin not installed” error occurs because those factory methods only have an implementation in compas_occ and not (yet) in compas_rhino.
what does the input (geometry) look like?
tom
I am essentially trying to build a brep representation of a plate from the top and bottom curves. The Brep.from_extrusion has a cap option, but there is no such possibility for a loft between 2 closed curves.
The curves are shown in green and Brep.from_loft returns the side edges in red:
I can generate a mesh in the same way as the compas_model’s PlateElement, and it gives me all the faces including the top and bottom, but when I have a top or bottom surface with interior corners, the mesh triangulation returns overlapping faces as seen in the image in the original post. I can’t seem to find any sort of TrimSurface or BrepFace.from_loop that I can generate and join to close the Brep.
i will try to add an implementation for Brep.from_polygons for compas_rhino soonish.
in the meantime, i think you can still accomplish what you need using Brep.from_mesh. the reason why this currently fails is because it uses the centroid of the polygon to implicitly convert the polygon to triangles to convert to an Ngon. if you use earclipping instead the problem should go away. this is not part of the default behaviour of meshes yet, but you could do something like this…
from compas.geometry import earclip_polygon
bottom_points = [...]
bottom_faces = earclip_polygon(bottom_points)
bottom_mesh = Mesh.from_vertices_and_faces(bottom_points, bottom_faces)
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Hi Oli,
Another way to go about it would be to use the Brep.from_loft and then cap it via the wrapped native Rhino brep. Capping will be exposed as brep.cap_planar_holes() in the next COMPAS release.
Chen
