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Boolean memory

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Numsgil:
Yeah, angle between them is the difference in their relative angles.

And yes, it only really makes sense if A and B are directional vectors and not points.

The dot product is just:

A.x * B.x + A.y * B.y

Cross product is:

+/- (A.x * B.y - A.y * B.x)

(+/- depending on what "handedness" you're using).

ikke:
I remember learning this at Delft university. This has confronted me with the knowledge that I can no longer reproduce this on my own. Knowledge has a half life...

Botsareus:
Wow, this formula is awesome. Thx for teaching me that Numsgil. , I did some basic tests on it, I will do rigorous testing on it when I get a chance.

Botsareus:
I just realized I don't need to divide by (|A| * |B|) because all it does is rescale the triangle.

Numsgil:
if A and B are unit length, you don't need to.  Or if they cancel out in some way later in the problem, you don't need to.

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