Rendering Spheres

Concept

Using the ray tracer that I have implemented, I wanted to render a pool or orbeze. Orbeze are dielectric materials and have a very unique behaviour of reflecting light. Such a goal would be very costly in the physical world but no worries, CG has me covered.

Scene

I will use an algorithm to simulate a pool of orbeze that is realistic. This was the bottleneck in making of the scene. I have not figured out that for now.

Image Features

Sampling/Anti-Aliasing

Each pixel is sampled 10 times to prevent sharp edges

Reflection Model

There are 4 types of materials implemented in this scene: metal, diffuse (lambertian), diffuse(cosine), dielectric (glass)

Removed Shadow Acne (calculation bugs)

Removing shadow acne improve brightness

Extended Tracer

• More realistic reflection
• Better lighting

Acceleration Structure: BVH

• Taking in the objects and dividing them.
• Checking if leaf node? if so return the objects

Appearance and Lighting

• Phong model to simulate external light sources
• 4 materials used

Timing

All the images had these properties:

• Rendered on Extended Tracer - Ray Depth = 10
• Antialiasing doen - Samples = 10
• 1920 x 1920 pixels
• All sphere primitives - spheres are slightly costly

Scenes:

• 5 spheres
  • Without BVH: 60620 milliseconds
  • With BVH: 84552 milliseconds
• 30 spheres
  • Witout BVH: I waited for 2-3 mins…
  • With 80232 milliseconds
• 100 spheres
  • Without BVH: I waited for 5 mins+ …

  • With BVH: 289919 milliseconds

Sources

Ray Tracing From The Ground Up

Ray Tracing in One Weekend