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@@ -145,9 +145,9 @@ degrees to either side:
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# calculate vector from a to b
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var dvec = (point_b - point_a).normalized()
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# rotate 90 degrees
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- var normal = Vector2(dvec.y,-dev.x)
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+ var normal = Vector2(dvec.y, -dvec.x)
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# or alternatively
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- # var normal = Vector2(-dvec.y,dev.x)
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+ # var normal = Vector2(-dvec.y, dvec.x)
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# depending the desired side of the normal
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The rest is the same as the previous example, either point_a or
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@@ -169,7 +169,7 @@ Some examples of planes
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Here is a simple example of what planes are useful for. Imagine you have
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a `convex <http://www.mathsisfun.com/definitions/convex.html>`__
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polygon. For example, a rectangle, a trapezoid, a triangle, or just any
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-polygon where faces that don't bend inwards.
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+polygon where no faces bend inwards.
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For every segment of the polygon, we compute the plane that passes by
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that segment. Once we have the list of planes, we can do neat things,
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@@ -199,8 +199,8 @@ physics engines use this to detect collision.
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The idea is really simple! With a point, just checking if a plane
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returns a positive distance is enough to tell if the point is outside.
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-With another polygon, we must find a plane where *all the **other**
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-polygon points* return a positive distance to it. This check is
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+With another polygon, we must find a plane where *all* *the* ***other***
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+*polygon* *points* return a positive distance to it. This check is
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performed with the planes of A against the points of B, and then with
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the planes of B against the points of A:
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amirea