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Rabattement (also rabatment ) is a rotation of a planar object around a folding line in order to align the object with another plane. Rabattement is used in technical drawings to produce developments (patterns, templates). In these drawings the object is "unfolded" to lay flat on a plane so it can be represented in entirety. Term comes from French: rabbatement (an act of lowering), due to the typical alignment plane being the horizontal one ("rabatment in the plan", sometimes, a vertical plane is used, "in elevation").

Technique of rabattment is very old: the archaic drawing that predated the antiquity used similar methods in painting to achieve "intellectual realism" (as opposed to "visual realism" of later times) by "unfolding" the object to represent its hidden sides.

Rabattement was extensively used by stonemasons in the construction drawings, and, together with projection plane, evolved into the method of the descriptive geometry. Descriptive geometry works sometimes use the term "rotation" when discussing moving points and lines, reserving rabattement for shapes and planes, both operations are identical.

The goal of the rabattement operation is to represent the true shape and size of a face of an object (this is often impossible to do with orthographic projection).

References

1. "rabatment". Collins English Dictionary. HarperCollins.
2. ^ Calvo-López 2020, p. 675.
3. ^ Olivier 2020, p. 25.
4. Calvo-López 2020, p. 31.
5. Calvo-López 2020, p. 449.
6. Calvo-López 2020, p. 367.
7. Calvo-López 2020, p. 636.

Sources

• Calvo-López, José (2020). "Problems". Stereotomy. Vol. 4. Cham: Springer International Publishing. pp. 573–642. doi:10.1007/978-3-030-43218-8_12. ISBN 978-3-030-43217-1.
• Olivier, Laurent (2020-08-31). "In the eye of the dragon: how the ancient Celts viewed the world" (PDF). In Martin, Toby F; Morrison, Wendy (eds.). Barbaric Splendour. Oxford: Archaeopress Access Archaeology. pp. 18–32. ISBN 978-1-78969-659-2. OCLC 1156994415.

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