reflect method
Reflect this.
Implementation
void reflect(Vector3 normal) {
final dotProduct = 2.0 * normal.dot(this);
_v3storage[2] -= normal._v3storage[2] * dotProduct;
_v3storage[1] -= normal._v3storage[1] * dotProduct;
_v3storage[0] -= normal._v3storage[0] * dotProduct;
}