newmtl mat17
  Kd 0.27 0.35 0.39

newmtl mat23
  Kd 0.10 0.10 0.10

newmtl mat21
  Kd 1.00 1.00 1.00

newmtl mat15
  Kd 0.81 0.85 0.86

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

newmtl mat16
  Kd 0.47 0.56 0.61