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Short answer: rounding down. Long answer: The ray in the image above might be represented as r = u + tv where u = <0,-3/4> and v = <1, 8/9>, i.e. r follows the line y = (3/4)+ (9/8)x. Note: that is a typo, it should read y = (3/4)+ (8/9)x. Thus, ray.origin.x = 0 and ray.origin.y = -3/4. We can start from these terms: y = y₀ + mx. The ray ...


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