Lecture 5: Texture Mapping (21)
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Some insight to better understand this equation: The distance from the center X to BC is AX×BCBC=LBC(x,y)BC\frac{AX \times BC}{|BC|} = \frac{L_{BC}(x, y)}{|BC|} and the distance from A to BC is LBC(xA,yA)BC\frac{L_{BC}(x_A, y_A)}{|BC|}. Divide one distance by another and then we get α=LBC(x,y)LBC(xA,yA)\alpha = \frac{L_{BC}(x, y)}{L_{BC}(x_A, y_A)}.

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