Function refract

refract(
    vect1: ChalkboardVector,
    vect2: ChalkboardVector,
    refractiveIndex: number,
): ChalkboardVector
Calculates the refraction vector of two vectors.
Parameters
- vect1: ChalkboardVector
  The first vector (the incident vector)
- vect2: ChalkboardVector
  The second vector (the normal vector)
- refractiveIndex: number
  The refractive index of the refractive medium
Returns ChalkboardVector
Example
```
// Returns a refracted vector when light passes from air to water
const refracted = Chalkboard.vect.refract(Chalkboard.vect.init(0, -1), Chalkboard.vect.init(0, 1), 1.33);
```
- Defined in Chalkboard.vect.ts:951