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Acceleration Structures

Warning

This is a Beta Feature and not all things work with this.

Bounding Volume Hierarchy

Bounding Volume Hierarchy (or BVH) acts like a primitive object, just like Triangle or Sphere. So we can simply pass a BVH object into raytrace function.

Warning

The backward pass for BVH is currently broken

RayTracer.AccelerationStructure — Type
AccelerationStructure

Base Type for all Acceleration Structures. These can be used to speed up rendering by a significant amount. The main design behind an acceleration structure should be such that it can be used as a simple replacement for a vector of Objects.

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RayTracer.BVHNode — Type
BVHNode

A node in the graph created from the scene list using BoundingVolumeHierarchy.

Fields:

  • x_min - Minimum x-value for the bounding box
  • x_max - Maximum x-value for the bounding box
  • y_min - Minimum y-value for the bounding box
  • y_max - Maximum y-value for the bounding box
  • z_min - Minimum z-value for the bounding box
  • z_max - Maximum z-value for the bounding box
  • index_start - Starting triangle in the scene list
  • index_end - Last triangle in the scene list
  • left_child - Can be nothing or another BVHNode
  • right_child - Can be nothing or another BVHNode
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RayTracer.BoundingVolumeHierarchy — Type
BoundingVolumeHierarchy

An AccelerationStructure which constructs bounding boxes around groups of triangles to speed up intersection checking. A detailed description of ths technique is present here.

Fields:

  • scene_list - The scene list passed into the BVH constructor but in sorted order
  • root_node - Root BVHNode

Constructors:

  • BoundingVolumeHierarchy(scene::Vector)
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