108 lines
2.5 KiB
Python
108 lines
2.5 KiB
Python
# This script uses bmesh operators to make 2 links of a chain.
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import bpy
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import bmesh
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import math
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import mathutils
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# Make a new BMesh
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bm = bmesh.new()
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# Add a circle XXX, should return all geometry created, not just verts.
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bmesh.ops.create_circle(
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bm,
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cap_ends=False,
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radius=0.2,
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segments=8)
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# Spin and deal with geometry on side 'a'
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edges_start_a = bm.edges[:]
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geom_start_a = bm.verts[:] + edges_start_a
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ret = bmesh.ops.spin(
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bm,
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geom=geom_start_a,
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angle=math.radians(180.0),
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steps=8,
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axis=(1.0, 0.0, 0.0),
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cent=(0.0, 1.0, 0.0))
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edges_end_a = [ele for ele in ret["geom_last"]
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if isinstance(ele, bmesh.types.BMEdge)]
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del ret
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# Extrude and create geometry on side 'b'
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ret = bmesh.ops.extrude_edge_only(
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bm,
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edges=edges_start_a)
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geom_extrude_mid = ret["geom"]
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del ret
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# Collect the edges to spin XXX, 'extrude_edge_only' could return this.
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verts_extrude_b = [ele for ele in geom_extrude_mid
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if isinstance(ele, bmesh.types.BMVert)]
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edges_extrude_b = [ele for ele in geom_extrude_mid
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if isinstance(ele, bmesh.types.BMEdge) and ele.is_boundary]
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bmesh.ops.translate(
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bm,
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verts=verts_extrude_b,
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vec=(0.0, 0.0, 1.0))
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# Create the circle on side 'b'
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ret = bmesh.ops.spin(
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bm,
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geom=verts_extrude_b + edges_extrude_b,
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angle=-math.radians(180.0),
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steps=8,
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axis=(1.0, 0.0, 0.0),
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cent=(0.0, 1.0, 1.0))
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edges_end_b = [ele for ele in ret["geom_last"]
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if isinstance(ele, bmesh.types.BMEdge)]
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del ret
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# Bridge the resulting edge loops of both spins 'a & b'
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bmesh.ops.bridge_loops(
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bm,
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edges=edges_end_a + edges_end_b)
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# Now we have made a links of the chain, make a copy and rotate it
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# (so this looks something like a chain)
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ret = bmesh.ops.duplicate(
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bm,
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geom=bm.verts[:] + bm.edges[:] + bm.faces[:])
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geom_dupe = ret["geom"]
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verts_dupe = [ele for ele in geom_dupe if isinstance(ele, bmesh.types.BMVert)]
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del ret
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# position the new link
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bmesh.ops.translate(
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bm,
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verts=verts_dupe,
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vec=(0.0, 0.0, 2.0))
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bmesh.ops.rotate(
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bm,
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verts=verts_dupe,
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cent=(0.0, 1.0, 0.0),
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matrix=mathutils.Matrix.Rotation(math.radians(90.0), 3, 'Z'))
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# Done with creating the mesh, simply link it into the scene so we can see it
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# Finish up, write the bmesh into a new mesh
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me = bpy.data.meshes.new("Mesh")
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bm.to_mesh(me)
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bm.free()
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# Add the mesh to the scene
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obj = bpy.data.objects.new("Object", me)
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bpy.context.collection.objects.link(obj)
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# Select and make active
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bpy.context.view_layer.objects.active = obj
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obj.select_set(True)
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