# VertexAttributeTexture

class in `three-mesh-bvh`

```js
import { VertexAttributeTexture } from 'three-mesh-bvh';
```

Float, Uint, and Int VertexAttributeTexture implementations are designed to simplify the
efficient packing of a three.js BufferAttribute into a texture. An instance can be treated as a
texture and when passing as a uniform to a shader they should be used as a `sampler2d`,
`usampler2d`, and `isampler2d` when using the Float, Uint, and Int texture types respectively.

_extends THREE.DataTexture_

## Properties

### .overrideItemSize: number

Treats `BufferAttribute.itemSize` as though it were set to this value when packing the
buffer attribute texture. Throws an error if the value does not divide evenly into the
length of the BufferAttribute buffer (`count * itemSize % overrideItemSize`).

Specifically used to pack geometry indices into an RGB texture rather than an Red texture.

## Methods

### .updateFrom

```js
.updateFrom( attribute: BufferAttribute ): void
```

Updates the texture to have the data contained in the passed BufferAttribute using the
BufferAttribute `itemSize` field, `normalized` field, and TypedArray layout to determine
the appropriate texture layout, format, and type. The texture dimensions will always be
square. Because these are intended to be sampled as 1D arrays the width of the texture must
be taken into account to derive a sampling uv. See `texelFetch1D` in shaderFunctions.

- `attribute`, `BufferAttribute`