/usr/share/radiance/orange.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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orange.cal - texture for orange
orange must be unit sphere centered at origin
A1 = angular frequency
}
otex_psiz : .006; { was .003 }
otex_rand : .6;
otex_dx = otex_psiz * PI*sin(2*otex_X)/2*Py/otex_rad/A1 / otex_denom;
otex_dy = otex_psiz * -PI*sin(2*otex_X)/2*Px/otex_rad/A1 / otex_denom;
otex_dz = otex_psiz * PI*(sin(2*otex_X)/2*(Pz*Atan2(Py,Px)-1/sqrt(3)) +
sin(2*otex_Y)/sqrt(3))/otex_rad/A1 / otex_denom;
otex_X = PI * ((Atan2(Py,Px)*otex_rad - acos(Pz)/sqrt(3))/A1 +
otex_rand*noise3(Px/A1,Py/A1,Pz/A1));
otex_Y = PI * (2*acos(Pz)/sqrt(3)/A1 +
otex_rand*noise3((Px+1)/A1,(Py+1)/A1,(Pz+1)/A1));
otex_denom = (sq(sin(otex_X))+sq(sin(otex_Y)))^1.5;
otex_rad = sqrt(1-Pz*Pz);
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