ne-d3d12umddi-d3d12ddi_raytracing_acceleration_structure_type.md

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NE:d3d12umddi.D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE	D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE (d3d12umddi.h)	Specifies the ray tracing acceleration structure type.	10/19/2018	D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration	D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE, D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE,	d3d12umddi.h			Windows 10, version 1809						D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE	Windows	display	RS5	D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE d3d12umddi/D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE	apiref	HeaderDef	d3d12umddi.h	D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE	c++

D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration

-description

Specifies the ray tracing acceleration structure type.

-enum-fields

-field D3D12DDI_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL

Top-level acceleration structure.

-field 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)

-see-also