newmtl mat18
  Kd 1.00 0.80 0.53

newmtl mat13
  Kd 1.00 0.60 0.00

newmtl mat23
  Kd 0.10 0.10 0.10

newmtl mat3
  Kd 0.50 0.87 0.92

newmtl mat21
  Kd 1.00 1.00 1.00

newmtl mat20
  Kd 0.47 0.33 0.28

newmtl mat12
  Kd 1.00 0.92 0.23