// d3d12umddi.h

typedef enum D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE {
  D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL,
  D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL
} ;
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Windows Driver Kit DDI reference (ne-d3d12umddi-d3d12ddi_raytracing_acceleration_structure_type)

D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration

Description

Specifies the ray tracing acceleration structure type.

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:

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

D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE - NtDoc