# HitTriangleVertexPositionsKHR(3) Manual Page

## Name

HitTriangleVertexPositionsKHR - Vertices of an intersected triangle

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## Description

`HitTriangleVertexPositionsKHR`

  A variable decorated with the `HitTriangleVertexPositionsKHR` decoration will specify the object space vertices of the triangle at the current intersection in application-provided order. The positions returned are transformed by the geometry transform, which is performed at standard floating-point precision, but without a specifically defined order of floating-point operations to perform the matrix multiplication.

Valid Usage

- VUID-HitTriangleVertexPositionsKHR-HitTriangleVertexPositionsKHR-08747
  The `HitTriangleVertexPositionsKHR` decoration must be used only within the `AnyHitKHR` or `ClosestHitKHR` `Execution` `Model`

- VUID-HitTriangleVertexPositionsKHR-HitTriangleVertexPositionsKHR-08748
  The variable decorated with `HitTriangleVertexPositionsKHR` must be declared using the `Input` `Storage` `Class`

- VUID-HitTriangleVertexPositionsKHR-HitTriangleVertexPositionsKHR-08749
  The variable decorated with `HitTriangleVertexPositionsKHR` must be declared as an array of three vectors of three 32-bit float values

- VUID-HitTriangleVertexPositionsKHR-HitTriangleVertexPositionsKHR-08750
  The variable decorated with `HitTriangleVertexPositionsKHR` must be used only if the value of `HitKindKHR` is `HitKindFrontFacingTriangleKHR` or `HitKindBackFacingTriangleKHR`

- VUID-HitTriangleVertexPositionsKHR-None-08751
  The acceleration structure corresponding to the current intersection must have been built with `VK_BUILD_ACCELERATION_STRUCTURE_ALLOW_DATA_ACCESS_KHR`

## 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