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| ] produced by successive rabattements of its ] onto a single plane. All faces and relative position of colors are visible in one drawing]] | ] produced by successive rabattements of its ] onto a single plane. All faces and relative position of colors are visible in one drawing]] | ||
| '''Rabattement''' (also '''rabatment''') is a rotation of a planar object around a '''folding line''' in order to align the object with another plane.<ref>{{Cite Collins Dictionary|rabatment}}</ref>{{sfn|Calvo-López|2020|p=675}}<ref>{{Cite OED|rabatment|1618597997}}</ref> Rabattement is used in ] to produce ] (patterns, templates). In these drawings the object is "unfolded" to lay flat on a plane so it can be represented in entirety.{{sfn|Olivier|2020|p=25}} Term comes from {{langx|fr|rabbatement}} (an act of lowering), due to the typical alignment plane being the horizontal one{{sfn|Calvo-López|2020|p=31}} ("rabatment in the plan"{{sfn|Calvo-López|2020|p=449}}, sometimes, a vertical plane is used, "in elevation"{{sfn|Calvo-López|2020|p=367}}). | '''Rabattement''' (also '''rabatment''') is a rotation of a planar object around a '''folding line''' (using the line like a ]) in order to align the object with another plane.<ref>{{Cite Collins Dictionary|rabatment}}</ref>{{sfn|Calvo-López|2020|p=675}}<ref>{{Cite OED|rabatment|1618597997}}</ref> Rabattement is used in ] to produce ] (patterns, templates). In these drawings the object is "unfolded" to lay flat on a plane so it can be represented in entirety.{{sfn|Olivier|2020|p=25}} Term comes from {{langx|fr|rabbatement}} (an act of lowering), due to the typical alignment plane being the horizontal one{{sfn|Calvo-López|2020|p=31}} ("rabatment in the plan"{{sfn|Calvo-López|2020|p=449}}, sometimes, a vertical plane is used, "in elevation"{{sfn|Calvo-López|2020|p=367}}). | ||
| 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.{{sfn|Olivier|2020|p=25}} | 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.{{sfn|Olivier|2020|p=25}} | ||
| ]. B and D are the faces of the wall (]), also used as folding lines. A and C are ] of the arch faces on both sides of the wall]] | ]. B and D are the faces of the wall (]), also used as folding lines. A and C are ] of the arch faces on both sides of the wall]] | ||
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Rabattement (also rabatment) is a rotation of a planar object around a folding line (using the line like a hinge) 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
- "rabatment". Collins English Dictionary. HarperCollins.
- ^ Calvo-López 2020, p. 675.
- "rabatment". Oxford English Dictionary (Online ed.). Oxford University Press. doi:10.1093/OED/1618597997. (Subscription or participating institution membership required.)
- ^ Olivier 2020, p. 25.
- Calvo-López 2020, p. 31.
- Calvo-López 2020, p. 449.
- Calvo-López 2020, p. 367.
- 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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