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# init(from:surfaceShader:geometryModifier:)

Creates a custom material from an existing material, surface shader, and
geometry modifier.

```
init(from material: any Material, surfaceShader: CustomMaterial.SurfaceShader, geometryModifier: CustomMaterial.GeometryModifier? = nil) throws
```

## Parameters

`material`

The material from which to copy properties.

`surfaceShader`

The surface shader function.

`geometryModifier`

The geometry modifier shader function.

## Discussion

Use this initializer to create a custom material with the same
properties as another existing material, but with a geometry modifier
and surface shader.

---

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