300  // 300x300 pixel image
0.1 0.85  // ambient and diffuse reflection terms
-1.0 1.0 1.0  // Light source direction
30   // Sample the volume x times per ray looking for a change of sign.
5    // Take several iterations of the Bisection method.
0    // Take many iterations Newton iterations.
11  // Eleven metaballs are defined below.
1.0  //  iso-contour threshold value.
0 0 0 2.5 1.5             // Head (xc,yc,zc) lamda, sigma
-0.2 -0.3 -0.6 -7.9 124.5  // Left eye (xc,yc,zc) lamda, sigma
0.2 -0.3 -0.6 -7.9 124.5   // Right eye (xc,yc,zc) lamda, sigma
-0.3 0.2 -0.5 -3.3 150     // Mouth (xc,yc,zc) lamda, sigma
-0.2 0.25 -0.5 -3.3 120
-0.1 0.3 -0.5 -3.3 100
-0.0 0.3 -0.5 -3.3 100
0.1 0.3 -0.5 -3.3 100
0.2 0.25 -0.5 -3.3 120
0.3 0.2 -0.5 -3.3 150
0.0 0.05 -0.8 7.9 200.0    // Nose (xc,yc,zc) lamda, sigma
