HRay - a Haskell ray tracer
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Command line interface:
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To compile the command line interface with GHC:

ghc --make -O HRayMain -o HRay.exe

To run the progrma, execute HRay.exe !

Graphical user interface:
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To compile the graphical user interface with GHC:

ghc --make -O HRayGUI -o HRayGUI.exe

To run the progrma, execute HRayGUI.exe !

Note: please make sure you have gtk2hs 0.9.7 (http://haskell.org/gtk2hs/)
installed an your system, together with the last release of Gtk+ (www.gtk.org).