Constructor
new MathHelp()
Methods
angleTo(a, b, c)
计算3个空间点的夹角角度
Parameters:
| Name | Type | Description |
|---|---|---|
a |
THREE.Vector3 | 起点 |
b |
THREE.Vector3 | 夹角点,即基点 |
c |
THREE.Vector3 | 终点 |
directionExtendPoint(a, b, length)
计算同方向的延长线上的点
Parameters:
| Name | Type | Description |
|---|---|---|
a |
THREE.Vector3 | 起点 |
b |
THREE.Vector3 | 终点 |
length |
Number | 延长距离 |