/usr/share/radiance/brick.cal is in radiance-materials 4R1+20120125-1.
This file is owned by root:root, with mode 0o644.
The actual contents of the file can be viewed below.
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Brick patterns
A1 = Grout width
A2 = Nominal layer height
A3 = Nominal brick spacing
A4 = Offset
A5 = Brick brightness
A6 = Grout brightness
}
brick_xy = if( f_brick_xy, A5, A6 );
brick_x = if( f_brick_x, A5, A6 );
brick_y = if( f_brick_y, A5, A6 );
f_brick_xy = and( brick_inv,
if( brick_inx, brick_inh(Px+2*A1), brick_inh(Py+2*A1) ) );
f_brick_x = and( brick_inv, brick_inh(Px) ) ;
f_brick_y = and( brick_inv, brick_inh(Py) ) ;
brick_inx = .5 - Nx*Nx;
brick_inv = mod(Pz,A2) - A1 ;
brick_inh(h) = mod(h+floor(Pz/A2)*A4,A3) - A1;
brick_swx = if(brick_inx, 1, 0);
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