title: Simple ray tracing tutorial?
body: <p>Years ago at uni I wrote a ray tracer in C++, but now I can hardly remember any of it. Just for fun, I decided to try writing a ray tracer again, this time in C#. But sadly I'm struggling getting started with the translation from camera coordinates to world coordinates.</p>
  
  <p>Can anyone recommend me a good set of tutorials on writing a ray tracer from scratch? My maths knowledge is pretty basic, so I need to re-learn the matrix multiplication involved in working out where a point on the screen is in 3D space to cast a ray through it.</p>
  
  <p>The intersection with shapes and shading parts I think I can work out, but I need to go back to basics for the camera translation.</p>
  
  <p>Thanks!</p>