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    <p><strong>Is there anything else I can do to speed it up?</strong></p> <p>D, depending on the implementation and compiler, puts forth reasonably good performance. As you haven't explained what ray tracing methods and optimizations you're using already, then I can't give you much help there.</p> <p>The next step, then, is to run a timing analysis on the program, and recode the most frequently used code or slowest code than impacts performance the most in assembly.</p> <p>More generally, check out the resources in these questions:</p> <ul> <li><a href="https://stackoverflow.com/questions/362140/literature-and-tutorials-for-writing-a-ray-tracer">Literature and Tutorials for Writing a Ray Tracer</a></li> <li><a href="https://stackoverflow.com/questions/600357/anyone-know-of-a-really-good-book-about-ray-tracing">Anyone know of a really good book about Ray Tracing?</a></li> <li><a href="https://stackoverflow.com/questions/445456/computer-graphics-raytracing-and-programming-3d-renders">Computer Graphics: Raytracing and Programming 3D Renders</a></li> <li><a href="https://stackoverflow.com/questions/39473/raytracing-with-cuda">raytracing with CUDA</a></li> </ul> <p>I really like the idea of using a graphics card (a massively parallel computer) to do some of the work.</p> <p>There are many other raytracing related resources on this site, some of which are listed in the sidebar of this question, most of which can be found in the <a href="https://stackoverflow.com/questions/tagged/raytracing">raytracing tag</a>.</p>
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    1. COI'm trying to stay away from assembly :) Ray hits are lazily evaluated, and basic scene graph optimizations are performed (merging translation into the rotation matrix, stuff like that). Timing analysis indicates that the ray/sphere and ray/plane code are taking most of the time, but I honestly don't think I could do a better job than GDC at full optimization.
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