Porisma
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Vectors: planes, normals and distances

Find perpendicular feet and distances · Diagrams

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Projection length and signed displacement

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Four source roles: a perspective plane with A in it and P above its perpendicular foot; the same projection as a side view with height h; a positive-d plane reached from origin O along n; a negative-d plane reached opposite n. Distance uses an absolute value, whereas signed displacement is d/|n|.
Four source roles: a perspective plane with A in it and P above its perpendicular foot; the same projection as a side view with height h; a positive-d plane reached from origin O along n; a negative-d plane reached opposite n. Distance uses an absolute value, whereas signed displacement is d/|n|.
Four source roles: a perspective plane with A in it and P above its perpendicular foot; the same projection as a side view with height h; a positive-d plane reached from origin O along n; a negative-d plane reached opposite n. Distance uses an absolute value, whereas signed displacement is d/|n|.
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