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#!/usr/bin/python
"""
This script takes a Wavefront .obj file
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
def vertex_reference(n, nv):
if (n < 0):
return n + nv
return n - 1
inputfilenames = sys.argv[1:]
print "converting..."
print inputfilenames
for inputfilename in inputfilenames:
outputfilename = inputfilename.lower().replace(".obj", ".dat")
if (outputfilename == inputfilename):
outputfilename = outputfilename,append(".1")
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=[]
uv=[]
face=[]
texture=[]
uvForVertex=[]
uvsForTexture={}
textureForFace=[]
uvsForFace=[]
textureCounter = 0
interpretTexture = 0
materials = {}
max_v = [0.0, 0.0, 0.0]
min_v = [0.0, 0.0, 0.0]
# find materials from mtllib
for line in lines:
tokens = string.split(line)
#print "line :"
#print line
#print "tokens :"
#print tokens
if (tokens != []):
if (tokens[0] == 'mtllib'):
path = string.split(inputfilename, '/')
path[-1] = tokens[1]
materialfilename = string.join(path,'/')
print "going to open material library file: %s" % materialfilename
infile = open( materialfilename, "r")
mlines = infile.read().splitlines(0)
newMaterial = 0
for mline in mlines:
tokens1 = string.split(mline)
if (tokens1 != []):
if (tokens1[0] == 'newmtl'):
newMaterialName = tokens1[1]
newMaterial = 1
if (tokens1[0] == 'map_Kd'):
if (newMaterial):
materials[newMaterialName] = tokens1[1]
print "Material %s -> %s" % (newMaterialName, tokens1[1])
newMaterial = 0
#print "materials :"
#print materials
# find geometry vertices first
for line in lines:
tokens = string.split(line)
if (tokens != []):
if (tokens[0] == 'v'):
n_verts = n_verts + 1
# negate x value for vertex to allow correct texturing...
x = -float(tokens[1])
y = float(tokens[2])
z = float(tokens[3])
vertex.append( ( x, y, z) )
vertex_lines_out.append('%.5f, %.5f, %.5f\n' % ( x, y, z))
if (x > max_v[0]):
max_v[0] = x
if (y > max_v[1]):
max_v[1] = y
if (z > max_v[2]):
max_v[2] = z
if (x < min_v[0]):
min_v[0] = x
if (y < min_v[1]):
min_v[1] = y
if (z < min_v[2]):
min_v[2] = z
#print "vertex:"
#print vertex, len(vertex), n_verts
#print "\n"
# find texture coordinates next
for line in lines:
tokens = string.split(line)
if (tokens != []):
if (tokens[0] == 'vt'):
uv.append( ( float(tokens[1]), 1.0 - float(tokens[2])) )
#print "uv:"
#print uv, len(uv), n_verts
#print "\n"
# find faces next
# use red colour to show smoothing groups
smoothing_group = 127
for line in lines:
tokens = string.split(line)
if (tokens != []):
if (tokens[0] == 's'):
# we just step through the groups not bothering to check the group number
smoothing_group = smoothing_group + 1
if (smoothing_group > 255):
smoothing_group = 0
if (tokens[0] == 'usemtl'):
textureName = tokens[1]
if (materials.has_key(textureName)):
textureName = materials[textureName]
interpretTexture = 1
texture.append(textureName)
uvsForTexture[textureName] = n_verts * [[]]
if (tokens[0] == 'f'):
#print "line: %s" % line
while (len(tokens) >=4):
bits = string.split(tokens[1], '/')
v1 = vertex_reference(int(bits[0]), n_verts)
if (bits[1] > ''):
vt1 = vertex_reference(int(bits[1]), n_verts)
bits = string.split(tokens[2], '/')
v2 = vertex_reference(int(bits[0]), n_verts)
if (bits[1] > ''):
vt2 = vertex_reference(int(bits[1]), n_verts)
bits = string.split(tokens[3], '/')
v3 = vertex_reference(int(bits[0]), n_verts)
if (bits[1] > ''):
vt3 = vertex_reference(int(bits[1]), n_verts)
else:
interpretTexture = 0
#print "face (geometry): %d %d %d" % (v1, v2, v3)
#print "face (textures): %d %d %d\n" % (vt1, vt2, vt3)
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 = math.sqrt(xp[0]*xp[0] + xp[1]*xp[1] + xp[2]*xp[2])
if (det > 0):
n_faces = n_faces + 1
# norm = (xp[0]/det, xp[1]/det, xp[2]/det)
# negate the normal to allow correct texturing...
norm = ( -xp[0]/det, -xp[1]/det, -xp[2]/det)
face.append((v1,v2,v3))
faces_lines_out.append('%d,127,127,\t%.5f,%.5f,%.5f,\t3,\t%d,%d,%d\n' % (smoothing_group,norm[0],norm[1],norm[2],v1,v2,v3))
if (interpretTexture):
textureForFace.append(textureName)
uvsForTexture[textureName][v1] = uv[vt1]
uvsForTexture[textureName][v2] = uv[vt2]
uvsForTexture[textureName][v3] = uv[vt3]
uvsForFace.append([ uv[vt1], uv[vt2], uv[vt3]])
tokens = tokens[:2]+tokens[3:]
# begin final output...
outputfile.write('// output from Obj2DatTex.py Wavefront text file conversion script\n')
outputfile.write('// (c) 2005 By Giles Williams\n')
outputfile.write('// \n')
outputfile.write('// original file: "%s"\n' % inputfilename)
outputfile.write('// \n')
outputfile.write('// model size: %.3f x %.3f x %.3f\n' % ( max_v[0]-min_v[0], max_v[1]-min_v[1], max_v[2]-min_v[2]))
outputfile.write('// \n')
outputfile.write('// textures used: %s\n' % uvsForTexture.keys())
outputfile.write('// \n')
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')
# check that we have textures for every vertex...
okayToWriteTexture = 1
#print "uvsForTexture :"
#print uvsForTexture
#print "uvsForFace :"
#print uvsForFace
if (len(textureForFace) != len(face)):
okayToWriteTexture = 0
if (len(uvsForFace) != len(face)):
okayToWriteTexture = 0
for texture in textureForFace:
if (texture == ''):
okayToWriteTexture = 0
# if we're all clear then write out the texture uv coordinates
if (okayToWriteTexture):
outputfile.write('TEXTURES\n')
for i in range(0, len(face)):
facet = face[i]
texture = textureForFace[i]
uvForVertex = uvsForTexture[texture]
outputfile.write('%s\t1.0 1.0\t%.5f %.5f\t%.5f %.5f\t%.5f %.5f\n' % (texture, uvsForFace[i][0][0], uvsForFace[i][0][1], uvsForFace[i][1][0], uvsForFace[i][1][1], uvsForFace[i][2][0], uvsForFace[i][2][1]))
outputfile.write('\n')
outputfile.write('END\n')
outputfile.close();
print "done"
print ""
#
# end
#
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