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stl_tools.py
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stl_tools.py
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from stl import mesh
import numpy as np
def reposition(mesh):
# takes the mesh and makes it start at 0, 0, 0 so all mesh positions are
# positive
#
x_extent = get_extent(mesh, 0)
y_extent = get_extent(mesh, 1)
z_extent = get_extent(mesh, 2)
xmin = min(x_extent)
ymin = min(y_extent)
zmin = min(z_extent)
return_array = np.zeros((len(mesh), 3))
count = 0
for i in range(len(mesh)):
return_array[count][0] = mesh[i][0] + abs(xmin)
count += 1
count = 0
for i in range(len(mesh)):
return_array[count][1] = mesh[i][1] + abs(ymin)
count += 1
count = 0
for i in range(len(mesh)):
return_array[count][2] = mesh[i][2] + abs(zmin)
count += 1
return return_array
def get_uniq_pc(fname):
# return unique point cloud taking points from each triangle
fullmesh = mesh.Mesh.from_file(fname)
allmesh = np.concatenate((fullmesh.v0, fullmesh.v1, fullmesh.v2), axis=0)
mesh_uniq = np.unique(allmesh, axis=0)
return mesh_uniq
def get_mid_array(mesh_uniq, thickness, axis):
if axis == 'x' or axis == 'X':
axisnum = 0
if axis == 'y' or axis == 'Y':
axisnum = 1
if axis == 'z' or axis == 'Z':
axisnum = 2
zmin = min(mesh_uniq[:, axisnum])
zmax = max(mesh_uniq[:, axisnum])
mid = (zmax - zmin) / 2 + zmin
if(thickness == "all"):
thickness = zmax
count = 0
for i in range(len(mesh_uniq)):
if (mesh_uniq[i, axisnum] <= mid + (thickness / 2)
and mesh_uniq[i, axisnum] >= mid - (thickness / 2)):
count += 1
midarray = np.zeros((count, 3))
a = 0
for i in range(len(mesh_uniq)):
if (mesh_uniq[i, axisnum] <= mid + (thickness / 2)
and mesh_uniq[i, axisnum] >= mid - (thickness / 2)):
midarray[a] = mesh_uniq[i]
a += 1
return midarray
def get_extent(mesh_uniq, axis):
# reurns a list of 2 values, minimum and maximum of an axis
extent = []
extent.append(mesh_uniq[0, axis])
extent.append(mesh_uniq[0, axis])
for i in range(len(mesh_uniq)):
if (mesh_uniq[i, axis] < extent[0]):
extent[0] = mesh_uniq[i, axis]
if (mesh_uniq[i, axis] > extent[1]):
extent[1] = mesh_uniq[i, axis]
return extent
def boundingorigin(mesh_un):
# returns origin of cube
origin = (get_extent(mesh_un, 0)[0],
get_extent(mesh_un, 1)[0],
get_extent(mesh_un, 2)[0])
return origin
def boundingsize(mesh_un):
origin = (get_extent(mesh_un, 0)[0],
get_extent(mesh_un, 1)[0],
get_extent(mesh_un, 2)[0])
size = (get_extent(mesh_un, 0)[1] - origin[0],
get_extent(mesh_un, 1)[1] - origin[1],
get_extent(mesh_un, 2)[1] - origin[2])
return size
def get_half_points(mesh_uniq, which_half, extent, axis):
# returns mesh points from left or right half
# which_half = bool of 0 = left, 1 = right
halfway_val = (extent[1] + extent[0]) / 2
a = 0
for i in range(len(mesh_uniq)):
if(which_half == 0):
if(mesh_uniq[i, axis] < halfway_val):
a += 1
else:
if(mesh_uniq[i, axis] > halfway_val):
a += 1
half_mesh_array = np.zeros((a, 3))
count = 0
for i in range(len(mesh_uniq)):
# print("a = " + str(a) + ", i = " + str(i))
if(which_half == 0):
if(mesh_uniq[i, axis] < halfway_val):
half_mesh_array[count] = mesh_uniq[i]
count += 1
else:
if(mesh_uniq[i, axis] > halfway_val):
half_mesh_array[count] = mesh_uniq[i]
count += 1
return half_mesh_array
def get_condyle(mesh_uniq, extent_y, half):
# Takes half the points (ie. roughly one condyle) measures some percentage
# from the back to find the condyle width
if(half == 0):
length = abs(extent_y[1] - extent_y[0])
instep_point = (length * 0.15) + extent_y[0]
a = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 1] < instep_point):
a += 1
temp_mesh_array = np.zeros((a, 3))
count = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 1] < instep_point):
temp_mesh_array[count] = mesh_uniq[i]
count += 1
inside_condyle_bound = get_extent(temp_mesh_array, 0)[0]
b = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 0] > inside_condyle_bound):
b += 1
FW_mesh_array = np.zeros((b, 3))
count = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 0] > inside_condyle_bound):
FW_mesh_array[count] = mesh_uniq[i]
count += 1
return FW_mesh_array
if(half == 1):
length = abs(extent_y[1] - extent_y[0])
instep_point = (length * 0.15) + extent_y[0]
a = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 1] < instep_point):
a += 1
temp_mesh_array = np.zeros((a, 3))
count = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 1] < instep_point):
temp_mesh_array[count] = mesh_uniq[i]
count += 1
inside_condyle_bound = get_extent(temp_mesh_array, 0)[1]
b = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 0] < inside_condyle_bound):
b += 1
FW_mesh_array = np.zeros((b, 3))
count = 0
for i in range(len(mesh_uniq)):
if(mesh_uniq[i, 0] < inside_condyle_bound):
FW_mesh_array[count] = mesh_uniq[i]
count += 1
return FW_mesh_array
def split_into_thirds(mesh, axis):
# Split mesh into thirds along a specific axis
mesh_extent = get_extent(mesh, axis)
mesh_third = abs(mesh_extent[1] - mesh_extent[0]) / 3
b = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + mesh_third):
b += 1
mesh_array_one = np.zeros((b, 3))
count = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + mesh_third):
mesh_array_one[count] = mesh[i]
count += 1
b = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + (mesh_third*2) and
mesh[i, axis] > mesh_extent[0] + (mesh_third * 1)):
b += 1
mesh_array_two = np.zeros((b, 3))
count = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + (mesh_third * 2) and
mesh[i, axis] > mesh_extent[0] + (mesh_third * 1)):
mesh_array_two[count] = mesh[i]
count += 1
b = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + (mesh_third * 3) and
mesh[i, axis] > mesh_extent[0] + (mesh_third * 2)):
b += 1
mesh_array_three = np.zeros((b, 3))
count = 0
for i in range(len(mesh)):
if(mesh[i, axis] < mesh_extent[0] + (mesh_third * 3) and
mesh[i, axis] > mesh_extent[0] + (mesh_third * 2)):
mesh_array_three[count] = mesh[i]
count += 1
mesharray_thirds = []
mesharray_thirds.append(mesh_array_one)
mesharray_thirds.append(mesh_array_two)
mesharray_thirds.append(mesh_array_three)
return mesharray_thirds