{ RCSid: $Id: tilt.cal,v 2.3 2003/02/22 02:07:23 greg Exp $ } { tilt.cal - tilt data for IES luminaires } tilt_ang = Acos(Kz) / DEGREE; tilt_xang = if(Jy*Jy-FTINY, Asin(Jy/sqrt(Jy*Jy+Jz*Jz))/DEGREE, 0); tilt_ang2 = tri(tilt_ang, 90); tilt_xang2 = tri(tilt_xang, 90);