LaunchSizeKHR(3)

# LaunchSizeKHR(3) Manual Page

## Name

LaunchSizeKHR - Launch dimensions for ray shaders

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## Description

`LaunchSizeKHR`

  A variable decorated with the `LaunchSizeKHR` decoration will contain the `width`, `height`, and `depth` dimensions passed to the vkCmdTraceRaysKHR or vkCmdTraceRaysNV command that initiated this shader execution. The `width` is in the first component, the `height` is in the second component, and the `depth` is in the third component.

Valid Usage

- VUID-LaunchSizeKHR-LaunchSizeKHR-04269
  The `LaunchSizeKHR` decoration must be used only within the `RayGenerationKHR`, `IntersectionKHR`, `AnyHitKHR`, `ClosestHitKHR`, `MissKHR`, or `CallableKHR` `Execution` `Model`

- VUID-LaunchSizeKHR-LaunchSizeKHR-04270
  The variable decorated with `LaunchSizeKHR` must be declared using the `Input` `Storage` `Class`

- VUID-LaunchSizeKHR-LaunchSizeKHR-04271
  The variable decorated with `LaunchSizeKHR` must be declared as a three-component vector of 32-bit integer values

## See Also

No cross-references are available

## 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 2014-2026 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0