Dat2ObjTex.py

#!/usr/bin/python 

""" 
This script takes a .dat file from the Elite/Oolite source 
and exports a .obj file containing the same geometry. 

Material for the faces is created from the dat file.
Only 1 texture can be handled at this time. 
""" 

import sys, string, math 

def tex_index(tex, vts):
	for i in range(len(vts)):
		if vts[i]==tex:
			return i
	return -1
	
inputfilenames = sys.argv[1:] 
print "converting..." 
print inputfilenames 
for inputfilename in inputfilenames: 
   outputfilename = inputfilename.lower().replace(".dat",".obj") 
   materialfilename = inputfilename.lower().replace(".dat",".mtl") 
   mtllibname = string.split(materialfilename, "/")[-1]
   objname=mtllibname.replace(".mtl","")
   texname=objname+'_auv'
   inputfile = open(inputfilename,"r") 
   lines = inputfile.read().splitlines(0) 

   mode = 'SKIP' 
   vertex_lines_out = [] 
   tex_lines_out = [] 
   faces_lines_out = ['g '+objname+'_'+texname+'\n'] 
   faces_lines_out.append ('usemtl '+texname) 
    
   n_verts = 0 
   n_faces = 0 
   skips = 0 
   vertex=[] 

   texfile=''
   vts=[]
   texForFace={}
   texErr=0

   for line in lines: 
	  if (line[:8] == 'TEXTURES'): 
		mode = 'TEXTURE' 
	  if (mode == 'TEXTURE'):
		tokens = string.split(line, '\t')	# split line by tabs
		if (len(tokens) > 3):
			if texfile == '':
				texfile=tokens[0]
			else:
				if tokens[0] != texfile:
					print ''
					print inputfilename+' : more than 1 texture, cannot convert. Use Dat2Obj instead.'
					print ''
					texErr=1
					break
			points = tokens[2:]
			tff=[]
			for point in points:
				v=string.split (point,' ')
				vt = ('%.6f %.6f' % (float(v[0]),1-float(v[1])))
				if not(vt in vts):
					vts.append(vt)
					tex_lines_out.append('vt '+vt+'\n')
				tff[len(tff):]=[tex_index(vt, vts)]
			texForFace[n_faces]=tff
			#print tff
			n_faces=n_faces + 1
	
   if texErr==0:
	   n_faces=0
	   for line in lines: 
	      if (mode == 'VERTEX'): 
	         coordinates = string.split(line, ',')   # split line by commas 
	         if (len(coordinates) == 3): 
	            n_verts = n_verts + 1 
	            x = -float(coordinates[0]) 
	            y = float(coordinates[1]) 
	            z = float(coordinates[2]) 
	            vertex.append( (x, y, z) ) 
	            vertex_lines_out.append('v %.6f %.6f %.6f\n' % ( x, y, z)) 
	            vertex.append( (x, y, z ) ) 
	      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:] 
	             
	            faces_lines_out.append ('\nf ') 
	            for i in range( 0,int(n_points)) :
	               faces_lines_out.append ('%i/%i/ ' % (int(point_data[i])+1,texForFace[n_faces][i]+1))
	            n_faces = n_faces + 1 
				   
	            # 

	      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' 
	      if (line[:8] == 'TEXTURES'): 
	         mode = 'TEXTURE' 
	      # 
	   outputfile = open(outputfilename,"w") 
	   outputfile.write('# Exported with Dat2ObjTex.py (C) Giles Williams 2005 - Kaks 2008\n') 
	   outputfile.write('mtllib %s\n' % mtllibname) 
	   outputfile.write('o '+objname+'\n')
	   outputfile.write('# %d vertices,' % n_verts) 
	   outputfile.write(' %d faces\n' % n_faces) 
	   outputfile.writelines(vertex_lines_out) 
	   outputfile.writelines(tex_lines_out) 
	   outputfile.writelines(faces_lines_out) 
	   outputfile.writelines('\n\n') 
	   outputfile.close(); 
	   
	   materialfile = open(materialfilename,"w") 
	   materialfile.write('# Exported with Dat2ObjTex.py (C) Giles Williams 2005 - Kaks 2008\n') 
	   materialfile.write('newmtl '+texname+'\nNs 100.000\n') 
	   materialfile.write('d 1.00000\nillum 2\n') 
	   materialfile.write('Kd 1.00000 1.00000 1.00000\nKa 1.00000 1.00000 1.00000\n') 
	   materialfile.write('Ks 1.00000 1.00000 1.00000\nKe 0.00000e+0 0.00000e+0 0.00000e+0\n') 
	   materialfile.write('map_Kd '+texfile+'\n\n') 
	   materialfile.close();
	   print inputfilename+"->"+outputfilename+" & "+materialfilename 

print "done" 
print "" 
# 
#   end 
#