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Clarify cross product a bit #237

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Clarify cross product a bit #237

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4 changes: 2 additions & 2 deletions webgl/lessons/webgl-3d-camera.md
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Expand Up @@ -179,8 +179,8 @@ straight up. Given that, if we know which way is up, in this case
(0,1,0), We can use that and something called a "cross product" to compute
the X axis and Y axis for the matrix.

I have no idea what a cross product means in mathematical terms. What I
do know is that if you have 2 unit vectors and you compute the cross
A cross product is a way of multiplying vectors that produces a third vector
normal, or perpendicular, to their common plane. If you have 2 unit vectors and you compute the cross
product of them you'll get a vector that is perpendicular to those 2
vectors. In other words, if you have a vector pointing south east, and a
vector pointing up, and you compute the cross product you'll get a vector
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