Triangulace čtyřúhelníku

pseudokód (počítání s vektory JS neumí)
var maxI = 4; // vodorovne
var maxJ = 4; // svisle
for(var i = 0; i<=maxI; i++) {
  for(var j =0; j<=maxJ; j++) {
    var v1 = A+(i/maxI)*(B-A); // na usečce AB
    var v2 = D+(i/maxI)*(C-D); // na úsečce DC
    var v = (j/maxJ)*v1+((maxJ-j)/maxJ)*v2; // vnitřní bod
    poleBodu[i][j] = v;
    // pokud je i>0, tak propoj s bodem vlevo - poleBodu[i-1][j]
    // pokud je j>0, tak propoj s bodem dole - poleBodu[i][j-1]
    // pokud je i>0 && j>0, pak propoj s bodem sikmo dolu vlevo - poleBodu[i-1][j-1]
    usecky.push([v, druhyBodUsecky]);
  }
}

svn checkout svn://cgg.mff.cuni.cz/grcis/trunk/

    /// <summary>
    /// Camera setup, called for every frame prior to any rendering.
    /// </summary>
    private void SetCamera ()
    {
      Vector3 cameraPosition = new Vector3( 0.0f, 0, (float)upDownZoom.Value );

      Matrix4 rotateX = Matrix4.CreateRotationX( (float)-elevationAngle );
      Matrix4 rotateY = Matrix4.CreateRotationY( (float)azimuthAngle );

      cameraPosition = Vector3.Transform( cameraPosition, rotateX );
      cameraPosition = Vector3.Transform( cameraPosition, rotateY );

      GL.MatrixMode( MatrixMode.Modelview );
      Matrix4 lookAt = Matrix4.LookAt( cameraPosition, Vector3.Zero, up );

      GL.LoadMatrix( ref lookAt );
    }