Steep parallax shader

The first assignment for graphics programming 4 was to implement lighting in Cg shaders. I wanted more of a challenge so started reading up on parallax shaders. In the end I ended up with a steep parallax shader using ray-marching through a height map. I didn't spend much time optimizing it as this little project was more about understanding how it worked.

Features:

• Supporting point light, directional light, and spot light.
• Diffuse texture, normal map, specular map, and height map inputs.
• Self shadowing (the height map details can produce shadows on itself).