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Decent vector library for C?

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Hi

 

I am writing a raytracer in C an was wondering if anyone knew a fast vector math "library" for it?

 

Any suggestions would be greatly appreciated.

Thanks 

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I prefer eigen. It's header only, fast (heavily vectorized and lots of template magic to make all operations efficient), packed with features and works everywhere. There are some quirks to be learned, because it's more like a math library, rather than a gamedev / graphics one.

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