# VkAccelerationStructureTypeKHR(3) Manual Page

## Name

VkAccelerationStructureTypeKHR - Type of acceleration structure

## C Specification

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

    typedef enum VkAccelerationStructureTypeKHR {
        VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR = 0,
        VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR = 1,
        VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_NV = VK_ACCELERATION_STRUCTURE_TYPE_TOP_LEVEL_KHR,
        VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_NV = VK_ACCELERATION_STRUCTURE_TYPE_BOTTOM_LEVEL_KHR,
        VK_ACCELERATION_STRUCTURE_TYPE_MAX_ENUM_KHR = 0x7FFFFFFF
    } VkAccelerationStructureTypeKHR;

or the equivalent

    typedef VkAccelerationStructureTypeKHR VkAccelerationStructureTypeNV;

## Description

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

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

## See Also

VkAccelerationStructureBuildGeometryInfoKHR, VkAccelerationStructureCreateInfoKHR

## 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 (c) 2014-2020 Khronos Group. This work is licensed under a Creative Commons Attribution 4.0 International License.