newmtl mat23
  Kd 0.10 0.10 0.10

newmtl mat15
  Kd 0.81 0.85 0.86

newmtl mat17
  Kd 0.27 0.35 0.39

newmtl mat16
  Kd 0.47 0.56 0.61

newmtl mat25
  Ka 1.00 0.65 0.67
  Kd 0.92 0.95 0.94
  Ks 1 1 1
  illum 9
  Ns 300
  d 0.4
  Ni 1.5