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layout: stdlib-reference
---

# HitTriangleVertexPosition

## Description

Get the vertex positions of the currently hit triangle in any-hit or closest-hit shader.
https://github.com/KhronosGroup/GLSL/blob/master/extensions/ext/GLSL_EXT_ray_tracing_position_fetch.txt



## Signature 

<pre>
<a href="../types/vector/index.html" class="code_type">vector</a>&lt;<span class="code_keyword">float</span>, 3&gt; <a href="hittrianglevertexposition-03bh.html">HitTriangleVertexPosition</a>(<span class="code_keyword">uint</span> <a href="hittrianglevertexposition-03bh.html#decl-index" class="code_param">index</a>);

</pre>

## Parameters

####  <a id="decl-index"></a>index  : uint
Index of the vertex (0-2)


## Return value
Object-space position of the specified vertex

## Remarks
Requires ray tracing position fetch extension

## Availability and Requirements

Defined for the following targets:

#### glsl
Available in stages: `closesthit`, `anyhit`.

#### spirv
Available in stages: `closesthit`, `anyhit`.

Requires capability: `spvRayTracingPositionFetchKHR`.


## See Also
GL_EXT_ray_tracing_position_fetch