用于生成随机数据的类。
| insideUnitCircle | 返回半径为 1 的圆形内的随机点（只读）。 |
| insideUnitSphere | 返回半径为 1 的球体内的随机点（只读）。 |
| onUnitSphere | 返回半径为 1 的球体表面上的随机点（只读）。 |
| rotation | 返回随机旋转（只读）。 |
| rotationUniform | 返回具有一致分布的随机旋转（只读）。 |
| state | 获取/设置随机数生成器的完整内部状态。 |
| value | 返回介于 0.0 [含] 与 1.0 [含] 之间的随机数（只读）。 |
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