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clipping in homogeneous coordinates (4d)

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Hello. I have problems with clipping line segment using sutherland-hodgeman algorithm in 4d homogeneous coordinates against frustum. I know that I should clip it against w (-w <= x;y;z <= +w) but I'm getting strange results. How should I compute t, interpolate parameters (x; y; z; w; u; v) if w is positive and how if it's negative?

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