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CAD mass properties: volume / area / centre of mass / inertia

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Port of snaporca c2821af783. New GeometryEngine::mass_properties over BRepGProp
(separate VolumeProperties/SurfaceProperties), bounds-checked
CadDocument::body_mass_properties, and a mass_properties MCP method. Query-only:
no CadFeature, no serialization, no version change. Analytic tests
(WithinRel/WithinAbs): cube 8000/2400/COM(0,0,10)/inertia 533333, cylinder
500pi/300pi, hollow = solid-500pi, invalid index -> valid=false.

Co-Authored-By: Claude Opus 4.8 <noreply@anthropic.com>
Claude-Session: https://claude.ai/code/session_01BVzKmX6Y1aEteit1HTXG4Q
This commit is contained in:
Tommaso Bianchi
2026-07-23 23:18:42 +02:00
co-authored by Claude Opus 4.8
parent 8edc12c8f1
commit b807be3c4a
6 changed files with 169 additions and 0 deletions
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src/slic3r/GUI/McpControl.cpp
+19
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@@ -187,6 +187,10 @@ json describe_tools()
json{{"name", "a"}, {"type", "object"}},
json{{"name", "b"}, {"type", "object"}},
})}},
json{{"name", "mass_properties"}, {"summary", "Volume / surface area / centre of mass / inertia tensor of a body."},
{"params", json::array({
json{{"name", "body"}, {"type", "integer"}, {"default", 0}},
})}},
json{{"name", "slice_body"}, {"summary", "Cross-section of a body by a base plane at an offset (sections-as-evidence); returns ordered world contours, each flagged closed/open."},
{"params", json::array({
json{{"name", "body"}, {"type", "integer"}, {"default", 0}},
@@ -367,6 +371,20 @@ json measure(DesignPanel* panel, const json& params)
return r;
}
json mass_properties(DesignPanel* panel, const json& params)
{
const TopoDS_Shape& shape = body_shape(panel, params);
auto mp = GeometryEngine::mass_properties(shape);
if (!mp.valid) throw std::runtime_error("mass properties could not be computed (null/empty shape)");
return json{
{"volume", mp.volume},
{"surface_area", mp.surface_area},
{"center_of_mass", json::array({mp.center_of_mass.x(), mp.center_of_mass.y(), mp.center_of_mass.z()})},
{"inertia", mp.inertia},
{"valid", mp.valid},
};
}
// Chain raw section segments (each a sampled-edge polyline) into ordered contours by joining
// endpoints within tol. Grows the tail; when the tail is stuck, reverses the contour and grows
// the other end. A contour is closed when its two ends meet. OCCT section vertices are exact,
@@ -785,6 +803,7 @@ std::string handle_on_main(const std::string& method, const json& params, const
if (method == "describe_scene") return rpc_result(id, describe_scene(panel));
if (method == "query_topology") return rpc_result(id, query_topology(panel, params));
if (method == "measure") return rpc_result(id, measure(panel, params));
if (method == "mass_properties") return rpc_result(id, mass_properties(panel, params));
if (method == "slice_body") return rpc_result(id, slice_body(panel, params));
if (method == "import_step") return rpc_result(id, import_step(panel, params));
if (method == "import_mesh") return rpc_result(id, import_mesh(panel, params));