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Comparing ray/src/util/reinhartb.cal (file contents):
Revision 2.5 by greg, Tue Aug 26 18:56:19 2014 UTC vs.
Revision 2.6 by greg, Fri Mar 27 18:58:06 2015 UTC

# Line 19 | Line 19 | Atan2(y,x) : posangle(atan2(y,x));
19  
20                                  { Default to Tregenza sky }
21   MF = 1;
22 +                                { Set to -1 for left-handed coordinate system }
23 + RHS = 1;
24                                  { Default axis orientation (+Y == north) }
25   rNx = 0; rNy = 0; rNz = -1;
26   Ux = 0; Uy = 1; Uz = 0;
27                                  { Compute oriented axis angles }
28   inc_dz = -Dx*rNx-Dy*rNy-Dz*rNz;
29 < inc_rx = -Dx*(Uy*rNz-Uz*rNy) - Dy*(Uz*rNx-Ux*rNz) - Dz*(Ux*rNy-Uy*rNx);
29 > inc_rx = -RHS*(Dx*(Uy*rNz-Uz*rNy) + Dy*(Uz*rNx-Ux*rNz) + Dz*(Ux*rNy-Uy*rNx));
30   inc_ry = Dx*Ux+Dy*Uy+Dz*Uz + inc_dz*(rNx*Ux+rNy*Uy+rNz*Uz);
31  
32   r_alt = Asin(inc_dz);

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