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Hello, I'm working on creating Polyhedrons from scratch. I searched through manual as well as API reference and I can't find a way to create openings in Polyhedron or PolyhedronFace. Am I missing something or it is API limitation?
Hi,
I am not sure, if this is what you are aiming to, but I created a surface-type polyhedron (so not a solid) consisting of just one face and I created an opening inside it using Allplan function "subtraction". You can find the result attached in zip file. Then I analyzed this polyhedron with this code snippet:
for i in range(polyhedron.GetFacesCount()):
face = polyhedron.GetFace(i)
print(f"{'-'*51} Face {i} {'-'*51}\n")
for face_edge in face.GetEdges():
print(f"Oriented edge handle {face_edge.EdgeHandle}; Positive: {face_edge.Positive}")
_, edge = polyhedron.GetEdge(face_edge)
print(f"Geometry edge: {edge.StartIndex} -> {edge.EndIndex}")
--------------------------------------------------- Face 0 --------------------------------------------------- Oriented edge handle 0; Positive: True Geometry edge: 0 -> 1 Oriented edge handle 1; Positive: True Geometry edge: 1 -> 2 Oriented edge handle 2; Positive: True Geometry edge: 2 -> 3 Oriented edge handle 3; Positive: True Geometry edge: 3 -> 0 Oriented edge handle 4; Positive: True Geometry edge: 4 -> 5 Oriented edge handle 5; Positive: True Geometry edge: 5 -> 6 Oriented edge handle 6; Positive: True Geometry edge: 6 -> 7 Oriented edge handle 7; Positive: True Geometry edge: 7 -> 4
Best,
Bart
Hi,
you need to create a Polyhedron for the opening and subtract it from the "body" polyhedron (see function MakeSubtraction).
Best regards
Horst
Thank you for your answers, but I'm not sure if solid subtraction is right approach. Most geometry engines allow faces to has more than one edge loop. Furthermore that would mean that solid need to store information about its geometry and its cutter as well. Is it really how Allplan handles solids?
To give my problem a bit of context, I'm working on link between Grasshopper (Rhino plugin) and Allplan. My aim is to process all of geometry work inside Grasshopper and export the result to Allplan. With solution you given that would be no longer the case.
Hi,
I am not sure, if this is what you are aiming to, but I created a surface-type polyhedron (so not a solid) consisting of just one face and I created an opening inside it using Allplan function "subtraction". You can find the result attached in zip file. Then I analyzed this polyhedron with this code snippet:
for i in range(polyhedron.GetFacesCount()):
face = polyhedron.GetFace(i)
print(f"{'-'*51} Face {i} {'-'*51}\n")
for face_edge in face.GetEdges():
print(f"Oriented edge handle {face_edge.EdgeHandle}; Positive: {face_edge.Positive}")
_, edge = polyhedron.GetEdge(face_edge)
print(f"Geometry edge: {edge.StartIndex} -> {edge.EndIndex}")
--------------------------------------------------- Face 0 --------------------------------------------------- Oriented edge handle 0; Positive: True Geometry edge: 0 -> 1 Oriented edge handle 1; Positive: True Geometry edge: 1 -> 2 Oriented edge handle 2; Positive: True Geometry edge: 2 -> 3 Oriented edge handle 3; Positive: True Geometry edge: 3 -> 0 Oriented edge handle 4; Positive: True Geometry edge: 4 -> 5 Oriented edge handle 5; Positive: True Geometry edge: 5 -> 6 Oriented edge handle 6; Positive: True Geometry edge: 6 -> 7 Oriented edge handle 7; Positive: True Geometry edge: 7 -> 4
Best,
Bart
@bmarciniec Yes that's exactly what I was looking for, works like a charm, thank you!
BTW: I think that what you wrote should be included in API manual
