This function is used to calculate the dot product of two vectors.
The dot product is a number calculated by multiplying the magnitudes of both vectors together, then multiplying that number by cosine of the angle between them.
For normalized vectors, the dot product will be:
-1 - If the vectors point in the exact opposite direction 0 - If the vectors are perpendicular 1 - If the vectors point the same direction
- otherVec: Vector3: The other vector.
- number The dot product.