D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration (d3d12umddi.h)

Specifies the ray tracing acceleration structure type.

Syntax

typedef enum D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE {
  D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL,
  D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL
} ;

Constants

D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL Top-level acceleration structure.
D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL Bottom-level acceleration structure.

Remarks

Geometry for a scene is described to the system using two levels of acceleration structures:

• Bottom-level acceleration structures each consist of a set of geometries that are building blocks for a scene.
• A top-level acceleration structure represents a set of instances of bottom-level acceleration structures.

Within a given bottom-level acceleration structure there can be any number either:

1. triangle meshes
2. procedural primitives initially described only by an axis-aligned bounding box (AABB)

Requirements

Requirement	Value
Minimum supported client	Windows 10, version 1809
Header	d3d12umddi.h