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C Specification

To build an acceleration structure call:

// Provided by VK_NV_ray_tracing
void vkCmdBuildAccelerationStructureNV(
    VkCommandBuffer                             commandBuffer,
    const VkAccelerationStructureInfoNV*        pInfo,
    VkBuffer                                    instanceData,
    VkDeviceSize                                instanceOffset,
    VkBool32                                    update,
    VkAccelerationStructureKHR                  dst,
    VkAccelerationStructureKHR                  src,
    VkBuffer                                    scratch,
    VkDeviceSize                                scratchOffset);


  • commandBuffer is the command buffer into which the command will be recorded.

  • pInfo contains the shared information for the acceleration structure’s structure.

  • instanceData is the buffer containing an array of VkAccelerationStructureInstanceKHR structures defining acceleration structures. This parameter must be NULL for bottom level acceleration structures.

  • instanceOffset is the offset in bytes (relative to the start of instanceData) at which the instance data is located.

  • update specifies whether to update the dst acceleration structure with the data in src.

  • dst is a pointer to the target acceleration structure for the build.

  • src is a pointer to an existing acceleration structure that is to be used to update the dst acceleration structure.

  • scratch is the VkBuffer that will be used as scratch memory for the build.

  • scratchOffset is the offset in bytes relative to the start of scratch that will be used as a scratch memory.


Valid Usage
Valid Usage (Implicit)
Host Synchronization
  • Host access to commandBuffer must be externally synchronized

  • Host access to the VkCommandPool that commandBuffer was allocated from must be externally synchronized

Command Properties
Command Buffer Levels Render Pass Scope Supported Queue Types Pipeline Type




See Also

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