Rendering

• Rendering or image synthesis is a process of generating an image from a 2D or 3D model using a computer program.
• input : Scene file containing multiple features
  • Model (3D or 2D model itself)
  • Texture
  • Shading
  • Shadows
  • Reflection
  • Lighting
  • Viewpoint
• output → final appearance

Volume Rendering

• A set of a technique used to display a 2D projection of a 3D discretely sampled data set.
• The primary objective in volume rendering is to get a transfer function which defines RGBα for every value for every possible voxel value in a given space.

View Synthesis

Neural Radiance Field

• NeRF or better known as Neural Radiance Fields is a state-of-the-art method that generates novel views of complex scenes by optimizing an underlying continuous volumetric scene function using a sparse set of input views.
• A continuous scene can be described as a 5D vector-valued function whose input is a 3D location x = (x; y; z) and 2D viewing direction (θ; Φ), and whose output is an emitted color c = (r; g; b) and volume density (α)