print 'linear transform a model`s uv space, by Beherith (mysterme@gmail.com)'
print 'usage: python uv_linear_transform_obj.py [modelname.obj] [a] [b] [c] [d] [newmodelname.obj]'
print 'where A is the multiplier and B is the offset of the U coords'
print 'and   C is the multiplier and D is the offset of the V coords'
print 'Unew=U*a+b    Vnew=V*c+d'
import sys
infile=open(sys.argv[1],'r').readlines()
outfile=open(sys.argv[6],'w')
a=float(sys.argv[2])
b=float(sys.argv[3])
c=float(sys.argv[4])
d=float(sys.argv[5])
for line in infile:
   if 'vt' in line:
      linesplit=line.split()
      u=float(linesplit[1])
      v=float(linesplit[2])
      u2=a*u+b
      v2=c*v+d
      outfile.write('vt '+str(u2)+' '+str(v2)+'\n')
   else:
      outfile.write(line)
print 'Done!'