@three3d/tools/doc/api/tools.createsymmetricsegmentedtrigonometricindexsbyvertexs.md

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## createSymmetricSegmentedTrigonometricIndexsByVertexs() function

创建对称分段的三角面索引

**Signature:**

```typescript
export declare function createSymmetricSegmentedTrigonometricIndexsByVertexs(vertexs: ArrayLike<number>, startIndex?: number, connectPre?: boolean | null): number[];
```

## Parameters

|  Parameter | Type | Description |
|  --- | --- | --- |
|  vertexs | ArrayLike&lt;number&gt; |  |
|  startIndex | number | _(Optional)_ 开始索引 |
|  connectPre | boolean \| null | _(Optional)_ 是否和之前的面进行拼接 |

**Returns:**

number\[\]

## Remarks

当几何体两侧总有对称的顶点时，可用此方法来为其构建三角面索引 本方法会根据转角方向来设置三角面，以使其看起来更合理