> ## Documentation Index
> Fetch the complete documentation index at: https://devdocs.xbox.com/llms.txt
> Use this file to discover all available pages before exploring further.

# D3D12_RAYTRACING_ACCELERATION_STRUCTURE_PREBUILD_INFO

> Represents prebuild information about a raytracing acceleration structure. Get an instance of this structure by calling.

Represents prebuild information about a raytracing acceleration structure. Get an instance of this structure by calling [GetRaytracingAccelerationStructurePrebuildInfo](/reference/graphics/d3d12/interfaces/id3d12device5/methods/id3d12device5_getraytracingaccelerationstructureprebuildinfo_public).

## Syntax

```cpp theme={null}
typedef struct D3D12_RAYTRACING_ACCELERATION_STRUCTURE_PREBUILD_INFO
{
    UINT64 ResultDataMaxSizeInBytes;
    UINT64 ScratchDataSizeInBytes;
    UINT64 UpdateScratchDataSizeInBytes;
} D3D12_RAYTRACING_ACCELERATION_STRUCTURE_PREBUILD_INFO
```

### Members

*ResultDataMaxSizeInBytes*\
Type: UINT64

Size required to hold the result of an acceleration structure build based on the specified inputs.

*ScratchDataSizeInBytes*\
Type: UINT64

Scratch storage on the GPU required during acceleration structure build based on the specified inputs.

#### UpdateScratchDataSizeInBytes

Scratch storage on GPU required during an acceleration structure update based on the specified inputs.  This only needs to be called for the original acceleration structure build, and defines the scratch storage requirement for every acceleration structure update, other than the initial build.

If the [D3D12\_RAYTRACING\_ACCELERATION\_STRUCTURE\_BUILD\_FLAG\_ALLOW\_UPDATE](/reference/graphics/d3d12/enums/d3d12_raytracing_acceleration_structure_build_flags_public) flag is not specified when calling [GetRaytracingAccelerationStructurePrebuildInfo](/reference/graphics/d3d12/interfaces/id3d12device5/methods/id3d12device5_getraytracingaccelerationstructureprebuildinfo_public), the returned value of this field is 0.

*UpdateScratchDataSizeInBytes*\
Type: UINT64

## Requirements

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


## Related topics

- [GetRaytracingAccelerationStructurePrebuildInfo](/reference/graphics/d3d12/interfaces/id3d12device5/methods/id3d12device5_getraytracingaccelerationstructureprebuildinfo_public.md)
- [D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_INPUTS](/reference/graphics/d3d12/structs/d3d12_build_raytracing_acceleration_structure_inputs_public.md)
- [D3D12_BUILD_RAYTRACING_ACCELERATION_STRUCTURE_DESC](/reference/graphics/d3d12/structs/d3d12_build_raytracing_acceleration_structure_desc_public.md)
- [D3D12_RAYTRACING_ACCELERATION_STRUCTURE_POSTBUILD_INFO_CURRENT_SIZE_DESC (XBOX Series consoles)](/reference/graphics/d3d12/structs/d3d12_raytracing_acceleration_structure_postbuild_info_current_size_desc_public.md)
- [D3D12_RAYTRACING_ACCELERATION_STRUCTURE_POSTBUILD_INFO_COMPACTED_SIZE_DESC (XBOX Series consoles)](/reference/graphics/d3d12/structs/d3d12_raytracing_acceleration_structure_postbuild_info_compacted_size_desc_public.md)