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Useful for representing a point with respect to a shape.
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We have a shape (triangle for 2D).
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The idea is that a point can be represented as the center of mass of three masses placed on the vertices of the triangle.
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The masses can be positive, negative and zero.
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They are positive if the point P is inside the triangle.
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They are calculated by finding the ratios of areas of triangles formed by the original sides and the point P.
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Since area, it’s also related to the cross product.