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A Simple Ray Tracing Demo
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This program illustrates a simple ray tracer. There are three scene files 
named scene1.txt, scene2.txt and scene3.txt. After compiling run the program 
like so

./ray_tracing scene1.txt


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COMPILING
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Will compile on linux with just a simple:

make

If, it does not compile check the linker flags in the Makefile and see if it 
suits your system. You may have to change the include paths for other 
systems.