Porisma
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Vectors: planes, normals and distances

Compare two planes · Diagrams

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Parallel planes and a common intersection line

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Left: distinct parallel plane patches with parallel normals n1,n2. Right: nonparallel plane patches meet on a straight line through P. Their normals, called a,b in the source intersection method, are n1,n2 here; the common-line direction is their cross product. Screen positions are schematic.
Left: distinct parallel plane patches with parallel normals n1,n2. Right: nonparallel plane patches meet on a straight line through P. Their normals, called a,b in the source intersection method, are n1,n2 here; the common-line direction is their cross product. Screen positions are schematic.
Left: distinct parallel plane patches with parallel normals n1,n2. Right: nonparallel plane patches meet on a straight line through P. Their normals, called a,b in the source intersection method, are n1,n2 here; the common-line direction is their cross product. Screen positions are schematic.
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