Compiler Error (Wings3d on Mac OS X)

Kostis Sagonas <>
Wed Jul 20 10:06:26 CEST 2005

Brent Fulgham wrote:
 > I'm getting an Internal Consistency Check error when attempting to  
 > build Wings3D on Mac OS X 10.4.2 (Erlang OTP R10B-6):
 > erlc -pa /ebin +warn_unused_vars -I/include -I ../e3d -W +debug_info  
 > '-Dwings_version="0.98.31"' -pa ../ebin -o../ebin wings_color.erl
 > wings_color: function internal_rgb_to_hsv/3+97:
 >   Internal consistency check failed - please report this bug.
 >   Instruction: {test,is_eq_exact,{f,80},[{x,0},{atom,error}]}
 >   Error:       {unsafe_instruction,{float_error_state,cleared}}:
 > make[2]: *** [../ebin/wings_color.beam] Error 1
 > What would people recommend as a first step toward debugging this  
 > problem?

I would recommend doing what you did:  Just report it to this list.

 > Is it arcana only in the realm of Ulf, Joe, ...

Perhaps the names Bjorn and Raimo are more appropriate here.  Until 
they are back from vacations, here is a solution to your problem.

Make the code look as follows and it will pass the compiler:

internal_rgb_to_hsv(R, G, B) ->
     Max = lists:max([R,G,B]),
     Min = lists:min([R,G,B]),
     V = Max,
     {Hue,Sat} = %% try
                          Min == B -> (G-Min)/(R+G-2.0*Min);
                          Min == R -> (1.0+(B-Min)/(B+G-2.0*Min));
                          Min == G -> (2.0+(R-Min)/(B+R-2.0*Min))
                 %% catch
                 %%     error:badarith ->
                 %%         {undefined,0.0}
                 %% end


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