Hi,
I'm trying to make randomly curled paper sheets, I have two questions on
this:
1. Although I don't need mutch detail I'd like to smooth the paper, so how
to calculate the normals for smooth triangles?
2. How do I generate random numbers between -30 and +30, in such a way that
there are mutch more between -15 and 15 than between -30 and 30?

ingo


#version 3.1;
#include "colors.inc"
global_settings{assumed_gamma 1.0}

light_source{
  <500,500,-500>
  color rgb 1
}
camera{
    location<0.0,0.0,-2.5>
    look_at<0.0,0.0,0.0>
}
//  #declare Rnd ......
#declare A=vrotate(vaxis_rotate(<-0.25,0.25,
0>,<1,1,0>,Rnd)+<-0.25,0.25,0>,<Rnd,Rnd,0>);
#declare B=vrotate(<0,0.5,0>,<Rnd,0,0>);
#declare C=vrotate(vaxis_rotate(<0.25,0.25, 0>,<1,-1, 0>,Rnd)
+<0.25,0.25,0>,<Rnd,Rnd,0>);
#declare D=vrotate(<-0.5,0,0>,<0,Rnd,0>);
#declare E=<0,0,0>;
#declare F=vrotate(<0.5,0,0>,<0,Rnd,0>);
#declare G=vrotate(vaxis_rotate(<-0.25,-0.25,0>,<-1,1,0>,Rnd)
+<-0.25,-0.25,0>,<Rnd,Rnd,0>);
#declare H=vrotate(<0,-0.5,0>,<Rnd,0,0>);
#declare I=vrotate(vaxis_rotate(<0.25,-0.25,0>,<-1,-1,0>,Rnd)
+<0.25,-0.25,0>,<Rnd,Rnd,0>);

mesh {
  triangle {A,B,D}
  triangle {D,B,E}
  triangle {E,B,F}
  triangle {B,C,F}
  triangle {D,G,H}
  triangle {D,H,E}
  triangle {E,H,F}
  triangle {H,I,F}
  scale <1,2,1>
  pigment {rgb 1}
}

---
Thank, to the Muse with the glass eye.

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