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# D3D12_SERIALIZED_RAYTRACING_ACCELERATION_STRUCTURE_HEADER

> Defines the header for a serialized raytracing acceleration structure.

Defines the header for a serialized raytracing acceleration structure.

## Syntax

```cpp theme={null}
typedef struct D3D12_SERIALIZED_RAYTRACING_ACCELERATION_STRUCTURE_HEADER
{
    D3D12_SERIALIZED_DATA_DRIVER_MATCHING_IDENTIFIER DriverMatchingIdentifier;
    UINT64 SerializedSizeInBytesIncludingHeader;
    UINT64 DeserializedSizeInBytes;
    UINT64 NumBottomLevelAccelerationStructurePointersAfterHeader;
} D3D12_SERIALIZED_RAYTRACING_ACCELERATION_STRUCTURE_HEADER
```

### Members

*DriverMatchingIdentifier*\
Type: D3D12\_SERIALIZED\_DATA\_DRIVER\_MATCHING\_IDENTIFIER

The driver-matching identifier.

*SerializedSizeInBytesIncludingHeader*\
Type: UINT64

The size of serialized data.

*DeserializedSizeInBytes*\
Type: UINT64

Size of the memory that will be consumed when the acceleration structure is deserialized.  This value is less than or equal to the size of the original acceleration structure before it was serialized.

*NumBottomLevelAccelerationStructurePointersAfterHeader*\
Type: UINT64

Size of the array of [D3D12\_GPU\_VIRTUAL\_ADDRESS](https://learn.microsoft.com/en-us/windows/desktop/direct3d12/d3d12_gpu_virtual_address) values that follow the header.  For more information, see [D3D12\_RAYTRACING\_ACCELERATION\_STRUCTURE\_POSTBUILD\_INFO\_SERIALIZATION\_DESC](/reference/graphics/d3d12/structs/d3d12_raytracing_acceleration_structure_postbuild_info_serialization_desc_public).

## Requirements

**Header:** d3d12\_xs.h\
**Library:** d3d12\_xs.lib\
**Supported Platforms**: XBOX Series consoles


## Related topics

- [D3D12_RAYTRACING_ACCELERATION_STRUCTURE_POSTBUILD_INFO_SERIALIZATION_DESC (XBOX Series consoles)](/reference/graphics/d3d12/structs/d3d12_raytracing_acceleration_structure_postbuild_info_serialization_desc_public.md)
- [D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_TOOLS_VISUALIZATION_HEADER (XBOX Series consoles)](/reference/graphics/d3d12/structs/d3d12_build_raytracing_acceleration_structure_tools_visualization_header_public.md)
- [D3D12_RAYTRACING_ACCELERATION_STRUCTURE_TYPE](/reference/graphics/d3d12/enums/d3d12_raytracing_acceleration_structure_type_public.md)
- [D3D12_RAYTRACING_ACCELERATION_STRUCTURE_SRV](/reference/graphics/d3d12/structs/d3d12_raytracing_acceleration_structure_srv_public.md)
- [D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_DESC](/reference/graphics/d3d12/structs/d3d12_build_raytracing_acceleration_structure_desc_public.md)