Projections {oblique projection, object} can keep all vertical lines vertical, have main horizontal axis at right angle to right of verticals, and have third axis at angle 45 degrees to left of verticals. Oblique projection has projection rays not perpendicular to the plane.
Mathematical Sciences>Geometry>Projections>Object Onto Planes
3-Geometry-Projections-Object Onto Planes
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Date Modified: 2022.0224