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Try subdividing boundaries to break up facets near torsion

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hodapp 2019-10-05 18:40:12 -04:00
parent 411dc06b69
commit a8c78287f1
2 changed files with 20 additions and 3 deletions
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2
examples.py
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@ -136,6 +136,8 @@ def gen_twisted_boundary(count=4, dx0=2, dz=0.2, ang=0.1):
[1, 0, 1], [1, 0, 1],
[0, 0, 1], [0, 0, 1],
], dtype=numpy.float64) - [0.5, 0, 0.5] ], dtype=numpy.float64) - [0.5, 0, 0.5]
b = meshutil.subdivide_boundary(b)
b = meshutil.subdivide_boundary(b)
# Generate 'seed' transformations: # Generate 'seed' transformations:
xfs = [meshutil.Transform().translate(dx0, 0, 0).rotate([0,1,0], numpy.pi * 2 * i / count) xfs = [meshutil.Transform().translate(dx0, 0, 0).rotate([0,1,0], numpy.pi * 2 * i / count)
for i in range(count)] for i in range(count)]

21
meshutil.py
View File

@ -1,6 +1,7 @@
import stl.mesh import stl.mesh
import numpy import numpy
import quaternion import quaternion
import random
import quat import quat
@ -158,7 +159,7 @@ def cube_distort(angle, open_xz=False):
# winding order? # winding order?
return FaceVertexMesh(verts, faces) return FaceVertexMesh(verts, faces)
def subdivide_boundary(bound): def split_boundary(bound):
# assume bound1 has shape (4,3). # assume bound1 has shape (4,3).
# Midpoints of every segment: # Midpoints of every segment:
mids = (bound + numpy.roll(bound, 1, axis=0)) / 2 mids = (bound + numpy.roll(bound, 1, axis=0)) / 2
@ -173,6 +174,16 @@ def subdivide_boundary(bound):
] ]
return bounds return bounds
def subdivide_boundary(bound):
# assume bound1 has shape (4,3).
# Midpoints of every segment:
mids = (bound + numpy.roll(bound, -1, axis=0)) / 2
b2 = numpy.zeros((bound.shape[0]*2, bound.shape[1]))
for i,row in enumerate(bound):
b2[2*i,:] = bound[i,:]
b2[2*i+1,:] = mids[i,:]
return b2
def join_boundary_simple(bound1, bound2): def join_boundary_simple(bound1, bound2):
# bound1 & bound2 are both arrays of shape (N,3), representing # bound1 & bound2 are both arrays of shape (N,3), representing
# the points of a boundary. This joins the two boundaries by # the points of a boundary. This joins the two boundaries by
@ -188,8 +199,12 @@ def join_boundary_simple(bound1, bound2):
for i in range(n): for i in range(n):
v0 = i v0 = i
v1 = (i + 1) % n v1 = (i + 1) % n
fs[2*i] = [n + v1, n + v0, v0] if random.random() < 0.5:
fs[2*i + 1] = [v1, n + v1, v0] fs[2*i] = [n + v1, n + v0, v0]
fs[2*i + 1] = [v1, n + v1, v0]
else:
fs[2*i] = [n + v1, n + v0, v1]
fs[2*i + 1] = [v1, n + v0, v0]
return FaceVertexMesh(vs, fs) return FaceVertexMesh(vs, fs)
def close_boundary_simple(bound): def close_boundary_simple(bound):