An exercise into ray tracing containing: Blinn-Phong shading, shadows, reflections, refractions, and anti-aliasing. Shadows take into account objects that let light through, and the ratio of reflected and refracted light of transparent objects is dependent on the view angle.

• Clone stb into directory external/stb.
• Build using CMake.

The above image contains three spheres having the properties, from left to right: partially reflective, partially refractive, fully transparent. The reflective and refractive spheres reflect and refract a constant fraction of light, the transparent sphere uses the Fresnel equation to determine the reflective and refractive fractions.

The below image contains three fully reflective planes, a checkerboard plane, and four partially refractive spheres.