Minor optimisation to Vector3::angleBetween()

[Waruck]

Since calculating squareroots is expensive in terms of cpu operations I would change this line of Vector3 (and Vector2)::angleBewteen():
from:

Code: Select all

Real lenProduct = length() * dest.length();

to:

Code: Select all

Real lenProduct = Math::Sqrt(squaredLength() * dest.squaredLength());

This way only one squareroot has to be calculated instead of two.

[duststorm]

Nice little fix, and good point.

[masterfalcon]

Good find. The same change can also be made to Vector2.