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Tommaso BianchiandClaude Opus 4.8
9da5851534
Pick a face of an existing body, offset it by a wall thickness along its normal, and append the resulting thin solid as a new body. Onshape-parity Tier-2 item; the kernel had Shell (hollow a whole solid) but no way to turn a single face into a plate. Kernel: CadFeatureType::Thicken, add_thicken()/apply_thicken() as a body-level op next to Transform/Mirror. The picked face is wrapped in a TopoDS_Shell and offset via BRepOffsetAPI_MakeThickSolid::MakeThickSolidBySimple; the result is orientation-normalised to positive volume (same convention as apply_mirror). Serialization stays append-only — thicken_face, thicken_thickness, thicken_flip appended to save/load, recipe version unchanged at 2. MCP: `thicken` method (body/face/thickness/flip) plus the missing feature_type_name() case. Tests: 6 new [CadDocument] cases (plate volume within 1%, flip direction, bad face id, zero thickness, fuse-with-source, round-trip). Golden fixture regenerated with a GoldenThicken feature and exact field-value assertions. Suite 57 -> 63 cases, 1054 -> 1119 assertions. Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com> Claude-Session: https://claude.ai/code/session_01BVzKmX6Y1aEteit1HTXG4Q