Diffracted intefering rays

[kaanaksit]

This subsection covered simulating refraction and reflection events. However, diffraction or interference [@born2013principles] is not introduced in this raytracing model. This is because diffraction and interference would require another layer of complication. In other words, rays have to have an extra dimension beyond their starting points and direction cosines, and they also have to have the quality named phase of light. This fact makes a typical ray have dimensions of [1 x 3 x 3] instead of [1 x 2 x 3], where only direction cosines and starting points are defined. Given the information, we challenge readers to create a new submodule, odak.learn.raytracing.diffraction, extending rays to diffraction and interference. In addition, a new set of unit tests should be derived to adopt this new function submodule. To add these to odak, you can rely on the pull request feature on GitHub. You can also create a new engineering note for arbitrary surfaces in docs/notes/raytracing_diffraction_interference.md.