##### Description of the problem

A bug for bevel contour algorithm.

The code below

```
function scalePt2( pt, vec, size ) {
if ( ! vec ) console.error( "THREE.ExtrudeGeometry: vec does not exist" );
return vec.clone().multiplyScalar( size ).add( pt );
}
```

in `src/geometry/ExtrudeGeometry.js`

which is definitely wrong when the center of the contour is not `(0, 0)`

.

It’s also very easy to test this wrong algorithm. In the example `webgl_geometry_extrude_shapes.html`

, you can just change the line 140 from

```
pts.push( new THREE.Vector2 ( Math.cos( a ) * l , Math.sin( a ) * l ) );
```

to

```
pts.push( new THREE.Vector2 ( Math.cos( a ) * l + 3, Math.sin( a ) * l ) );
```

Then, you’ll find the red bevel of the ‘star’ become strange.

##### Three.js version

0.86.0

##### Browser

- All of them

##### OS

- All of them

I don’t have a ad-hoc solution for this problem because the code obviously assumes that the contour is not translated. Unfortunately, i’m not familiar with this part of

`ExtrudeGeometry`

so i need to study the implementation first.Any help with this issue is highly appreciated😊