噴射

 噴射の炎を media を使って造ります。
//**********************************************************************************
 #local Cv1=<0.900, 0.395, 0.000>;
 #local Cv2=<0.800, 0.599, 0.000>;
 #local Cv3=<0.699, 0.500, 0.401>;
 #local M_spark =
  media { emission rgb 0.03 confidence 0.999 variance 0.001
  density { spherical
   color_map { [ 0.0 color rgb < 0, 0, 0 > ]
           [ 0.4 color rgb Cv1 ]
           [ 0.6 color rgb Cv2 ]
           [ 0.8 color rgb Cv3 ]
           [ 0.9 color rgb Cv1 ]
           [ 1.0 color rgb < 0, 0, 0 > ] } scale 10*2.15 } }
 #local Spark_seg = difference { sphere { 0, 30 } cylinder { 0,31*z 31 } }
 #local Spark_seg = object {Spark_seg hollow
  pigment { color rgbt < 1, 1, 1, 1 > } interior { media { M_spark } } scale 5 }
//**********************************************************************************