// ------------------------------
//  Demo for curves on a surface
// ------------------------------ 

//  fix rotation

rot_x=0.3745;
rot_y=0.445;
rot_z=0;

//  fix surface properties

surface_red  =240;
surface_green=220;
surface_blue =0;

transparence=60;

antialiasing=4;

//  fix light

illumination= ambient_light+
              diffuse_light+
              reflected_light+
              transmitted_light;

//  the formula 

surface=x^4+y^3+z^3-120;

//  draw it

clear_screen;
draw_surface;


//  fix curve properties

curve_width=4;
 
curve_red=255;
curve_green=0;
curve_blue=0;
plane=y;
cut_with_plane;

curve_red=0;
curve_green=255;
curve_blue=0;
plane=z;
cut_with_plane;

curve_red=0;
curve_green=0;
curve_blue=255;
plane=x;
cut_with_plane;