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#!/usr/bin/python
#original: http://web.media.mit.edu/~neilg/fab/dist/cam.py
class Stl:
'''stl import export tools, does not depend on OCC'''
def __init__(self, filename=None):
self.filename = filename
self.vertices, self.faces, self.boundarys, self.noise_flag = [], [], [], []
def read(self):
filename = self.filename
vertices, faces, boundarys, noise_flag = self.vertices, self.faces, self.boundarys, self.noise_flag
#
# STL parser
#
noise_flag = 0
vertex = 0
vertices = []
faces = []
boundarys = []
file = open(filename,'rb')
str = file.read()
file.close()
if (find(str,"vertex") != -1):
#
# ASCII file
#
print " ASCII file"
file = open(filename,'r')
str = file.readlines()
file.close()
line = 0
nlines = len(str)
while (line < nlines):
if (find(str[line],'vertex') != -1):
[vert, x, y, z] = split(str[line])
x1 = float(x)
y1 = float(y)
z1 = float(z)
vertices.append([x1,y1,z1])
vertex += 1
line += 1
[vert, x, y, z] = split(str[line])
x2 = float(x)
y2 = float(y)
z2 = float(z)
vertices.append([x2,y2,z2])
vertex += 1
line += 1
[vert, x, y, z] = split(str[line])
x3 = float(x)
y3 = float(y)
z3 = float(z)
vertices.append([x3,y3,z3])
vertex += 1
#faces.append([vertex-2,vertex-1,vertex,vertex-2])
faces.append([vertex-2,vertex-1,vertex])
line += 1
else:
#
# binary file
#
nfacets = (len(str)-84)/50
print " binary file with",nfacets,"facets"
for facet in range(nfacets):
index = 84 + facet*50
x1 = unpack('f',str[index+12:index+16])[0]
y1 = unpack('f',str[index+16:index+20])[0]
z1 = unpack('f',str[index+20:index+24])[0]
vertices.append([x1,y1,z1])
vertex += 1
x2 = unpack('f',str[index+24:index+28])[0]
y2 = unpack('f',str[index+28:index+32])[0]
z2 = unpack('f',str[index+32:index+36])[0]
vertices.append([x2,y2,z2])
vertex += 1
x3 = unpack('f',str[index+36:index+40])[0]
y3 = unpack('f',str[index+40:index+44])[0]
z3 = unpack('f',str[index+44:index+48])[0]
vertices.append([x3,y3,z3])
vertex += 1
#faces.append([vertex-2,vertex-1,vertex,vertex-2])
faces.append([vertex-2,vertex-1,vertex])
self.vertices, self.faces, self.boundarys, self.noise_flag = vertices, faces, boundarys, noise_flag
def write_STL():
faces, vertices, xmin, ymin, zmax = self.faces, self.vertices, self.xmin, self.ymin, self.zmax
#
# STL output
#
#text = outfile.get()
file = open(self.filename, 'w')
file.write("solid\n")
xyscale = float(sxyscale.get())
zscale = float(szscale.get())
xoff = float(sxmin.get()) - xmin*xyscale
yoff = float(symin.get()) - ymin*xyscale
zoff = float(szmax.get()) - zmax*zscale
#
# scale vertices
#
for vertex in range(len(vertices)):
x = vertices[vertex][X]*xyscale + xoff
y = vertices[vertex][Y]*xyscale + yoff
z = vertices[vertex][Z]*zscale + zoff
vertices[vertex] = [x,y,z]
#
# write file
#
nfaces = len(faces)
for face in range(nfaces):
#
# find normal
#
[x0,y0,z0] = vertices[faces[face][0]-1]
[x1,y1,z1] = vertices[faces[face][1]-1]
[x2,y2,z2] = vertices[faces[face][2]-1]
"""
[nx,ny,nz] = [-x0, -y1, -z2]
[d1x,d1y,d1z] = [x1-x0, y1-y0, z1-z0]
d1 = d1x*d1x + d1y*d1y + d1z*d1z
nd1 = nx*d1x + ny*d1y + nz*d1z
[nx,ny,nz] = [nx-nd1*d1x/d1, ny-nd1*d1y/d1, nz-nd1*d1z/d1]
[d2x,d2y,d2z] = [x2-x0, y2-y0, z2-z0]
d2d1 = d2x*d1x + d2y*d1y + d2z*d1z
[d2x,d2y,d2z] = [d2x-d2d1*d1x/d1, d2y-d2d1*d1y/d1, d2z-d2d1*d1z/d1]
d2 = d2x*d2x + d2y*d2y + d2z*d2z
nd2 = nx*d2x + ny*d2y + nz*d2z
[nx,ny,nz] = [nx-nd2*d2x/d2, ny-nd2*d2y/d2, nz-nd2*d2z/d2]
n = sqrt(nx*nx + ny*ny + nz*nz)
[nx,ny,nz] = [nx/n, ny/n, nz/n]
"""
[nx,ny,nz] = [0,0,0]
#
# write
#
file.write(" facet normal %f %f %f\n"%(nx,ny,nz))
file.write(" outer loop\n")
file.write(" vertex %f %f %f\n"%(x0,y0,z0))
file.write(" vertex %f %f %f\n"%(x1,y1,z1))
file.write(" vertex %f %f %f\n"%(x2,y2,z2))
file.write(" endloop\n")
file.write(" endfacet\n")
if (len(faces[face]) == 4):
#
# triangulate square face
#
[x3,y3,z3] = vertices[faces[face][3]-1]
file.write(" facet normal %f %f %f\n"%(nx,ny,nz))
file.write(" outer loop\n")
file.write(" vertex %f %f %f\n"%(x0,y0,z0))
file.write(" vertex %f %f %f\n"%(x2,y2,z2))
file.write(" vertex %f %f %f\n"%(x3,y3,z3))
file.write(" endloop\n")
file.write(" endfacet\n")
file.write("endsolid\n")
file.close()
print "wrote",nfaces,"STL facets to",text
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