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#!/usr/bin/python
"""
This script takes a .dat file from the Elite/Oolite source
and exports a .mesh file containing the same geometry.
Polygons with more than 3 edges have to be exported as a series of triangles
v0 v1 v2 v3 ... vn map to (v0 v1 v2) (v0 v2 v3) ... (v0 vn-1 vn)
Edges are calculated for each triangle.
Material for the faces is set to flat white (127,127,127)
and surface normals need not be calculated.
"""
import sys, string, math
inputfilenames = sys.argv[1:]
print "converting..."
print inputfilenames
for inputfilename in inputfilenames:
outputfilename = inputfilename.lower().replace(".dat",".mesh")
print inputfilename+"->"+outputfilename
inputfile = open(inputfilename,"r")
lines = inputfile.read().splitlines(0)
outputfile = open(outputfilename,"w")
mode = 'SKIP'
vertex_lines_out = ['VERTICES\r']
tris_lines_out = ['MATERIAL\t65535\t65535\t65535\t0\t0\t0\r']
extra_lines_out = []
extra_lines_out.append( 'MATERIAL\t0\t0\t65535\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t0\t65535\t0\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t0\t65535\t65535\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t65535\t0\t0\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t65535\t0\t65535\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t65535\t65535\t0\t0\t0\t0\r')
extra_lines_out.append( 'MATERIAL\t32768\t32768\t32768\t0\t0\t0\r' )
n_verts = 0
n_v = 0
n_faces = 0
n_f = 0
skips = 0
vertex=[]
edge=[]
triangle=[]
for line in lines:
if (mode == 'VERTEX'):
coordinates = string.split(line, ',') # split line by commas
if (len(coordinates) == 3):
x = float(coordinates[0])
y = float(coordinates[1])
z = float(coordinates[2])
vertex.append( (x, y, z) )
vertex_lines_out.append('%d\t%f\t%f\t%f\r' % (n_v, x, y, z))
n_v = n_v + 1;
elif (mode == 'FACES'):
tokens = string.split(line, ',') # split line by commas
if (len(tokens) > 9) :
color_data = tokens[0:3]
normal_data =tokens[3:6]
n_points = tokens[6]
point_data = tokens[7:]
v1 = int(point_data[0])
v2 = int(point_data[1])
v3 = int(point_data[2])
d0 = (vertex[v2][0]-vertex[v1][0], vertex[v2][1]-vertex[v1][1], vertex[v2][2]-vertex[v1][2])
d1 = (vertex[v3][0]-vertex[v2][0], vertex[v3][1]-vertex[v2][1], vertex[v3][2]-vertex[v2][2])
xp = (d0[1]*d1[2]-d0[2]*d1[1], d0[2]*d1[0]-d0[0]*d1[2], d0[0]*d1[1]-d0[1]*d1[0])
det = 1.0 / math.sqrt(xp[0]*xp[0] + xp[1]*xp[1] + xp[2]*xp[2])
norm = (xp[0]*det, xp[1]*det, xp[2]*det)
if ((norm[0]*float(normal_data[0]) < 0)|(norm[1]*float(normal_data[1]) < 0)|(norm[2]*float(normal_data[2]) < 0)) :
point_data.reverse()
v1 = int(point_data[0])
while (len(point_data) >= 3) :
v2 = int(point_data[1])
v3 = int(point_data[2])
edge1 = (v1, v2)
edge2 = (v1, v3)
edge3 = (v2, v3)
if (edge.count(edge1) == 0) :
edge.append(edge1)
if (edge.count(edge2) == 0) :
edge.append(edge2)
if (edge.count(edge3) == 0) :
edge.append(edge3)
triangle.append( (v1,v2,v3) )
tris_lines_out.append('%d\t%d\t%d\r' % (v1,v2,v3))
point_data = point_data[1:] # move on a point
#
elif (mode == 'SKIP'):
skips = skips + 1
#
if (line[:6] == 'NVERTS'):
mode = 'SKIP'
if (line[:6] == 'NFACES'):
mode = 'SKIP'
if (line[:6] == 'VERTEX'):
mode = 'VERTEX'
if (line[:5] == 'FACES'):
mode = 'FACES'
#
outputfile.write('Mesh\t1\t1\r')
outputfile.writelines(vertex_lines_out)
outputfile.write('EDGES\r')
for v0 in range(len(vertex)):
for v1 in range(len(vertex)):
if (edge.count((v0,v1)) > 0):
outputfile.write('%d\t%d\r' % (v0,v1))
edge.remove((v0,v1))
outputfile.writelines(tris_lines_out)
outputfile.writelines(extra_lines_out)
outputfile.write('END\r')
outputfile.close();
print "done"
print ""
#
# end
#
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