Hi,
The angle between vector (1, 0) and vector (0, 1) should be 90 degree as shown in below:
But why when I logged out BABYLON.Angle.BetweenTwoPoints(new BABYLON.Vector2(1, 0), new BABYLON.Vector2(0, 1).degrees()), it gives me 135?
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BABYLON.Angle.BetweenTwoPoints(a, b) is getting the angle between the x axis and b-a vector, so in your case (-1, 1), which is indeed 135°.
In your case, you should take the dot product to calculate the angle:
dot(a,b)=norm(a)*norm(b)*cos(ab)
Dot can be found in static BABYLON.Vector2 and norm is the length() function of the vector.
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Ah I see, thanks a lot!
why is it calculate (-1,1) in this case? can you explain more? do we have any playground for this?
In the example, B=(0,1) and A=(1,0), so B-A=(0-1,1-0)=(-1,1)
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The expression BetweenTwoPoints is bit of a misnomer since this function
const angle = BABYLON.Angle.BetweenTwoPoints(a, b);
finds the gradient angle of the vector2 b - a
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