card-trace

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A Rust version of the C++ "business card" ray tracer.

• original: http://www.cs.utah.edu/~aek/code/card.cpp
• explanation: http://fabiensanglard.net/rayTracing_back_of_business_card/index.php
• "clean" C++ code: https://gist.github.com/kid0m4n/6680629 (the original.cpp in this repo, edited to render Rust rather than Go.)
• Go version: https://github.com/kid0m4n/gorays
• Prompted by this ML post: https://mail.mozilla.org/pipermail/rust-dev/2013-September/005735.html

Run it

• rustc --opt-level=3 bin.rs
• ./bin > rust.ppm
• convert rust.{ppm,png}
• Open rust.png with your favourite viewer

Compare it

$ g++ -O3 -lm original.cpp -o cxx
$ time ./cxx > rust.ppm

real    0m17.923s
user    0m17.900s
sys     0m0.012s

$ clang++ -O3 -lm original.cpp -o cxx
$ time ./cxx > rust.ppm

real    0m13.755s
user    0m13.744s
sys     0m0.000s

$ rustc --opt-level=3 bin.rs -o rust
$ time ./rust > rust.ppm

real    0m17.883s
user    0m17.368s
sys     0m0.500s

These all render Rust.