/usr/share/radiance/landscape.cal is in radiance-materials 4R0+20110410-1build1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 20 21 22 23 24 25 26 27 | {
A set of randomly located points at known positions to be
interpolated by gensurf.
}
{ The following are our known point values }
point(i,j) = select( i*3+j+1,
2, 1, 5, { x0, y0, z0 }
3.7, 1, 1,
4.2, 2.5, 2,
3,7, 2.5, 4,
2, 2.5, 3,
2, 3.5, 2
);
Npoints = 6; { Number of points in above }
sq(x) : x*x;
Recip(x) : if( x, 1/x, 1e10 );
Sum(f,x,y,n) = if(n-.5, f(x,y,n-1)+Sum(f,x,y,n-1), 0);
weight(x,y,i) = Recip(sq(x-point(i,0)) + sq(y-point(i,1)));
wval(x,y,i) = weight(x,y,i) * point(i,2);
sheight(x,y) = Sum(wval,x,y,Npoints) / Sum(weight,x,y,Npoints);
|