@three3d/effect/doc/api/effect.bandgeometry.md

@three3d/effect 提供了 ThreeJS 的特效

<!-- Do not edit this file. It is automatically generated by API Documenter. -->

[Home](./index.md) &gt; [@three3d/effect](./effect.md) &gt; [BandGeometry](./effect.bandgeometry.md)

## BandGeometry class

带状几何体

**Signature:**

```typescript
export declare class BandGeometry extends PathGeometry<BandGeometryOptions> 
```
**Extends:** [PathGeometry](./effect.pathgeometry.md)<!-- -->&lt;[BandGeometryOptions](./effect.bandgeometryoptions.md)<!-- -->&gt;

## Remarks

可根据曲线、折线点来生成带状几何体； 支持路径追加； 支持设置起始长度 支持起始-终点颜色渐变 支持绘制的指定的长度区间 支持设置宽度 支持设置带状几何体起始位置处的向上方向

## Constructors

|  Constructor | Modifiers | Description |
|  --- | --- | --- |
|  [(constructor)(options)](./effect.bandgeometry._constructor_.md) |  | Constructs a new instance of the <code>BandGeometry</code> class |

## Properties

|  Property | Modifiers | Type | Description |
|  --- | --- | --- | --- |
|  [connectionType](./effect.bandgeometry.connectiontype.md) |  | LineConnectionType | 线的衔接类型 |
|  [drawType](./effect.bandgeometry.drawtype.md) |  | [PathDrawType](./effect.pathdrawtype.md) | CurvePath 的绘制类型 |
|  [fixUp](./effect.bandgeometry.fixup.md) |  | boolean | 是否固定 up；保证up不变 |
|  [frenetFrames](./effect.bandgeometry.frenetframes.md) |  | Point\_Length\_FrenetFrames \| null |  |
|  [geometryData](./effect.bandgeometry.geometrydata.md) | <code>readonly</code> | { position: number\[\]; normal: number\[\]; uv: number\[\]; index: number\[\]; color: number\[\]; lineDistance: number\[\]; lengths: number\[\]; points: Vector3\[\]; tangents: Vector3\[\]; normals: Vector3\[\]; binormals: Vector3\[\]; } \| null | 几何体的数据 |
|  [isBandGeometry](./effect.bandgeometry.isbandgeometry.md) | <code>readonly</code> | (not declared) |  |
|  [openedGeometryData](./effect.bandgeometry.openedgeometrydata.md) | <code>readonly</code> | [BandGeometryData](./effect.bandgeometrydata.md) \| null | 未闭合的几何体的数据 |
|  [options](./effect.bandgeometry.options.md) | <code>static</code> | [BandGeometryOptions](./effect.bandgeometryoptions.md) |  |
|  [smoothStepAngle](./effect.bandgeometry.smoothstepangle.md) |  | number \| undefined | 圆形衔接角的步长角 |
|  [smoothStepLength](./effect.bandgeometry.smoothsteplength.md) |  | number \| undefined | 圆形衔接角的长度步长 |
|  [up](./effect.bandgeometry.up.md) |  | IVector3 | 起点处的向上的方向 { x: 0, y: 1, z: 0 } |
|  [useU](./effect.bandgeometry.useu.md) |  | boolean | 是否固定 up；保证up不变 |
|  [uvStep](./effect.bandgeometry.uvstep.md) |  | number | uv的步长 |

## Methods

|  Method | Modifiers | Description |
|  --- | --- | --- |
|  [append(pathItem)](./effect.bandgeometry.append.md) |  |  |
|  [getDivisionIndex(vertexIndex)](./effect.bandgeometry.getdivisionindex.md) |  | 获取顶点索引对应的分段索引 |
|  [resetAttributes(attrs)](./effect.bandgeometry.resetattributes.md) |  | 重围所有的 Attributes |
|  [setDrawLength(startLength, endLength)](./effect.bandgeometry.setdrawlength.md) |  | 设置绘制的长度范围 |
|  [updateGeometry()](./effect.bandgeometry.updategeometry.md) |  |  |