> It works (not fine but with no errors) when I change Y by z:
> #local xyYtoR = function (x,y,z){ (x/y* 3.2406  -1.5372 + (1-x-y)/y *
> -0.4986)*Y/SkyMaxLuminance }
> I know this is not the good value but I try to see what happens.
> I use v3.6 and v3.7 with the same result.

If you change the Y to z in the parameter list then just change the Y to 
z in the equation too:

#local xyYtoR = function (x,y,z){ (x/y* 3.2406  -1.5372 + (1-x-y)/y *
-0.4986)*z/SkyMaxLuminance }

That should then work the same as the original version.

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