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engine, render: symmetry plane command on any datum plane (#242)

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model.boundary_condition.symmetry takes a datum plane of any orientation,
finds the faces on it and reports the plane's unit normal when it is
inclined; the glyph draws a support along that normal. Verified: half a plate
cut on its diagonal with the plane deflects as the half mirrored across it
(6.7e-13), the mirror conforming on the plane.

Co-Authored-By: Claude Opus 5.5 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01UhhZMBTviDQxZvwnyP89fo
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jyvikoandClaude Opus 5.5 authored and Irakli Kourtis committed 2026-10-16 10:38:20 -04:00
1 parent a226b7dcac
commit 992bc71b6b
3 files changed
+150 -18
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crates/engine/src/cmd/define.rs
+1 -1
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@@ -252,7 +252,7 @@ definition_commands!(
BoundaryCondition,
"boundary_condition",
"Boundary Condition",
r#"{"name": "clamp", "type": "fixed", "target": {"set": "root"} | {"reference_point": "RP"}} | {"name", "type": "displacement", "target", "values": [u1, u2, u3, ur1, ur2, ur3] (null leaves a degree of freedom free)} | {"name", "type": "symmetry", "target", "plane": "x|y|z" (the plane's normal)} — active in the steps that list it (model.step.activate)"#,
r#"{"name": "clamp", "type": "fixed", "target": {"set": "root"} | {"reference_point": "RP"}} | {"name", "type": "displacement", "target", "values": [u1, u2, u3, ur1, ur2, ur3] (null leaves a degree of freedom free)} | {"name", "type": "symmetry", "target", "plane": "x|y|z" | {"normal": [nx, ny, nz]} (the plane's normal; an inclined plane holds n · u = 0 and the rotations about its in-plane axes)} — active in the steps that list it (model.step.activate)"#,
super::forms::BOUNDARY_CONDITION,
super::forms::BOUNDARY_CONDITION_DELETE,
add_boundary_condition,