# BaseInstance(3) Manual Page

## Name

BaseInstance - First instance being rendered

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## Description

`BaseInstance`

  Decorating a variable with the `BaseInstance` built-in will make that variable contain the integer value corresponding to the first instance that was passed to the command that invoked the current vertex shader invocation. `BaseInstance` is the `firstInstance` parameter to a direct drawing command or the `firstInstance` member of a structure consumed by an indirect drawing command.

Valid Usage

- VUID-BaseInstance-BaseInstance-04181
  The `BaseInstance` decoration must be used only within the `Vertex` `Execution` `Model`

- VUID-BaseInstance-BaseInstance-04182
  The variable decorated with `BaseInstance` must be declared using the `Input` `Storage` `Class`

- VUID-BaseInstance-BaseInstance-04183
  The variable decorated with `BaseInstance` must be declared as a scalar 32-bit integer value

## 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 2014-2024 The Khronos Group Inc.

SPDX-License-Identifier: CC-BY-4.0