English: Four cases for an intersection of a line and a cylinder. Intersections are highlighted in red. Cylinder is gray. Global axes are back. The magenta line has zero intersections with the cylinder. Cyan line has a single point of intersection. Green line has two intersections. Yellow line is tangent to the cylinder, so has infinitely many points of intersection.
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BananaSlug
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Captions
Four types of intersection between line and cylinder