newmtl mat13
  Kd 1.00 0.60 0.00

newmtl mat21
  Kd 1.00 1.00 1.00

newmtl mat17
  Kd 0.27 0.35 0.39

newmtl mat9
  Kd 0.55 0.76 0.29

newmtl mat12
  Kd 1.00 0.92 0.23

newmtl mat3
  Kd 0.50 0.87 0.92