newmtl mat20
  Kd 0.47 0.33 0.28

newmtl mat15
  Kd 0.81 0.85 0.86

newmtl mat21
  Kd 1.00 1.00 1.00

newmtl mat23
  Kd 0.10 0.10 0.10

newmtl mat13
  Kd 1.00 0.60 0.00

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