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