/usr/share/radiance/glaze2.cal is in radiance-materials 4R0+20110410-1build1.
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1 2 3 4 5 6 7 8 9 10 11 12 13 14 15 16 17 18 19 | { RCSid: $Id: glaze2.cal,v 2.2 2003/06/30 18:12:24 greg Exp $ }
{
glaze2.cal - double-pane fritted and low-E glazings
Uses BRTDfunc type to get correct behavior.
Oct. 2002 Greg Ward
We only provide support functions for the nasty expressions
spat out for dual-glazings by glaze.csh.
}
{ Fresnel approximation }
fresne = exp(-5.85*abs(Rdot)) - exp(-5.85);
fr(r) = r + fresne*(1 - r);
ft(t) = t*(1 - fresne);
{ glass reflectance and transmittance }
rclr = fr(0.076);
tclr = ft(0.883);
{ combined double-pane reflectance }
cr(rf,t,rb) : rf + t*t*rb;
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