---
UID: NE:d3d12.D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE
title: D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE (d3d12.h)
description: Specifies the type of a raytracing acceleration structure.
old-location: direct3d12\d3d12_raytracing_acceleration_structure_type.htm
tech.root: direct3d12
ms.assetid: 2E77BD31-A04F-4AB3-9C03-E1A7D1C962AD
ms.date: 12/05/2018
ms.keywords: D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE, D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration, D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL, D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL, d3d12/D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE, d3d12/D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL, d3d12/D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL, direct3d12.d3d12_raytracing_acceleration_structure_type
f1_keywords:
- d3d12/D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE
dev_langs:
- c++
req.header: d3d12.h
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req.target-type: Windows
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topic_type:
- APIRef
- kbSyntax
api_type:
- HeaderDef
api_location:
- D3D12.h
api_name:
- D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE
targetos: Windows
req.typenames: D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE
req.redist: 
ms.custom: 19H1
---

# D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE enumeration


## -description


Specifies the type of a raytracing acceleration structure. 


## -enum-fields




### -field D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL

Top-level acceleration structure.


### -field D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL

Bottom-level acceleration structure.


## -remarks



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. 



