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#!/usr/bin/python
"""
This script takes a .mesh file from the Meshwork
and exports a .dat file containing the same trimesh.
Colour for the faces is set to flat grey (127,127,127)
and surface normals calculated for each triangle.
"""
import sys, string, math
inputfilenames = sys.argv[1:]
print "converting..."
print inputfilenames
for inputfilename in inputfilenames:
outputfilename = inputfilename.lower().replace(".mesh",".dat")
print inputfilename+"->"+outputfilename
inputfile = open(inputfilename,"r")
lines = inputfile.read().splitlines(0)
outputfile = open(outputfilename,"w")
mode = 'SKIP'
vertex_lines_out = ['VERTEX\n']
faces_lines_out = ['FACES\n']
n_verts = 0
n_faces = 0
skips = 0
vertex=[]
for line in lines:
if (mode == 'VERTEX'):
coordinates = string.split(line, '\t') # split line by tabs
if (len(coordinates) == 4):
n_verts = n_verts + 1
vertex_lines_out.append(coordinates[1]+', '+coordinates[2]+', '+coordinates[3]+'\n')
vertex.append( (float(coordinates[1]), float(coordinates[2]), float(coordinates[3])) )
elif (mode == 'FACES'):
tokens = string.split(line, '\t') # split line by tabs
if (len(tokens) == 3):
n_faces = n_faces + 1
v1 = int(tokens[0])
v2 = int(tokens[1])
v3 = int(tokens[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)
faces_lines_out.append('127,127,127,\t%f,%f,%f,\t3,\t%d,%d,%d\n' % (norm[0],norm[1],norm[2],v1,v2,v3))
elif (mode == 'SKIP'):
skips = skips + 1
if (line[:8] == 'VERTICES'):
mode = 'VERTEX'
if (line[:8] == 'MATERIAL'):
mode = 'FACES'
if (line[:5] == 'EDGES'):
mode = 'SKIP'
if (line[:3] == 'UVS'):
mode = 'SKIP'
outputfile.write('NVERTS %d\n' % n_verts)
outputfile.write('NFACES %d\n' % n_faces)
outputfile.write('\n')
outputfile.writelines(vertex_lines_out)
outputfile.write('\n')
outputfile.writelines(faces_lines_out)
outputfile.write('\n')
outputfile.write('END\n')
outputfile.close();
print "done"
print ""
#
# end
#
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