# VkAccelerationStructureTypeKHR(3) Manual Page

## Name

VkAccelerationStructureTypeKHR - Type of acceleration structure

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## C Specification

Values which can be set in VkAccelerationStructureCreateInfoKHR::`type` or VkAccelerationStructureInfoNV::`type` specifying the type of acceleration structure, are:

    // Provided by VK_KHR_acceleration_structure
    typedef enum VkAccelerationStructureTypeKHR {
        VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR = 0,
        VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR = 1,
        VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR = 2,
      // Provided by VK_NV_ray_tracing
        VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_NV = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR,
      // Provided by VK_NV_ray_tracing
        VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_NV = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR,
    } VkAccelerationStructureTypeKHR;

or the equivalent

    // Provided by VK_NV_ray_tracing
    typedef VkAccelerationStructureTypeKHR VkAccelerationStructureTypeNV;

## Description

- `VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR` is a top-level acceleration structure containing instance data referring to bottom-level acceleration structures.

- `VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR` is a bottom-level acceleration structure containing the AABBs or geometry to be intersected.

- `VK_ACCELERATION_STRUCTURE_TYPE_GENERIC_KHR` is an acceleration structure whose type is determined at build time used for special circumstances. In these cases, the acceleration structure type is not known at creation time, but must be specified at build time as either top or bottom.

## See Also

VK_KHR_acceleration_structure, VK_NV_ray_tracing, VkAccelerationStructureBuildGeometryInfoKHR, VkAccelerationStructureCreateInfoKHR, VkAccelerationStructureInfoNV

## Document Notes

For more information, see the Vulkan Specification

This page is extracted from the Vulkan Specification. Fixes and changes should be made to the Specification, not directly.

## Copyright

Copyright 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0