Function pingPong

pingPong(t: number, length: number): number
Ping-pong - oscillates value between 0 and length
Parameters
- t: number
  Input value
- length: number
  Length of oscillation
Returns number
Value oscillating between 0 and length
Example
```
pingPong(0, 1); // 0
pingPong(0.5, 1); // 0.5
pingPong(1.5, 1); // 0.5
pingPong(2, 1); // 0
```
- Defined in src/core/math/utils.ts:193