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Calculating colour bias of a point within a triangle

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Is there a way to compute the vertex colour bias of a point in a right-angled triangle? So imagine I've got a triangle with a red vertex, a blue and a green. For any given point within the triangle, how do i calculate how much red, green and blue should exist at that point (clamped obviously). I've been looking around and trying to work it out but no luck yet. Thanks for any help

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