OneCAD/tests/oracle

Reference tests (the oracle)

Each directory is one case:

• recipe.json: the part, written in SolidCraft's recipe format (sketches in sketch-local coordinates, features with their parameters, faces and edges picked by a world-space point). cargo xtask oracle replays it through SolidCraft's command engine.
• expected.json: what the part must measure, and where those numbers come from.
• reference.stl (optional): a fine triangulation of the expected part, used to check the shape itself (surface distance), not only its totals.

Run every case with cargo xtask oracle; it writes docs/oracle.md.

expected.json

{
  "source": "analytic",
  "method": "box 40 x 30 x 20: V = abc, A = 2(ab + bc + ca)",
  "body_count": 1,
  "volume_mm3": 24000.0,
  "area_mm2": 5200.0,
  "center_of_mass": [20.0, 15.0, 10.0],
  "bbox": { "min": [0.0, 0.0, 0.0], "max": [40.0, 30.0, 20.0] },
  "faces": 6
}

Field	Meaning
source	"analytic" (closed-form geometry, worked out by hand; method gives the formulas) or "freecad <version>" (built from the same recipe by tools/freecad-oracle/).
method	How the numbers were obtained: formulas for analytic cases, the construction for FreeCAD ones.
body_count	Number of solid bodies.
volume_mm3, area_mm2	Totals over all bodies.
center_of_mass	Volume-weighted centroid of all bodies (uniform density).
bbox	Axis-aligned bounding box of all bodies.
faces	Optional. Only where the geometry fixes the count: a face is a maximal smooth patch of one surface (a full cylinder side is one face; coplanar neighbours are one face).
compare	Optional. Restricts the comparison to these keys (for example ["volume_mm3", "area_mm2"] where kernels legitimately build different corner patches); note says why.
tolerance	Optional overrides: rel (volume, area; default 1e-3), abs_mm (centre of mass and bbox, default 1e-3 × the bbox diagonal), surface_mm (STL surface distance).
note	Optional remarks.

No value here was measured in, or exported from, any commercial CAD product.