I know two points in 3D space: {x1, y1, z1} and {x2, y2, z2} How do I find the coordinates of a third point at y=y3 on a straight line through those two points?
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Originally Posted by Dirlewanger I know two points in 3D space: {x1, y1, z1} and {x2, y2, z2} How do I find the coordinates of a third point at y=y3 on a straight line through those two points? The equation of the line is: If you know the value of then you can determine the value of r by solving the equation: Once you know the value of r you can plug it into the equation of the line to calculate the missing coordinates of the point.
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