Signed Distance Fields

As suggested by the feature documentation, I started my quest to implement the ability to render the Mandelbulb seen in my final render by reading the relevant articles on Inigo Quilez' blog. I also read the paper by John Hart et al. as well as an article about the Mandelbulb by Daniel White.
My implementation closely follows the series of blog posts by Mikael Christensen, which explicitely references Inigo Quilez, but presents the underlying ideas in a fashion that I as a person with no prior connection to rendering 3D fractals found more approachable.

As can be seen from my submission, my renderer is able to render the Mandelbulb, although I feel like the calculation of the normals does not always produce the correct results, although I did not have the time to investigate this further.