One plane. Two opposing pulls.
A simpler place to test release.
What we learned / what this tests
1. A plane divides the mould; it does not prove either half can move.
2. For two straight, opposing pulls, inspect solid intervals along lines normal to the plane. A cavity pocket beneath another part of the object traps a rigid mould half.
3. This tool samples those lines against the ORIGINAL triangles. White dots mark projected columns containing potential trapped mould. A and B are tested independently; order cannot solve a collision with the cast object.
4. No sampled obstruction is not a release certificate. Features between lines, self-intersections, tolerances, friction, draft allowance and physical material behaviour remain unchecked.
5. The mould previews are coarse stock blocks minus the sampled object, with a planar split. Exports are study meshes, without pouring gates, vents, bolts, keys or print clearance. Not fabrication-ready.
6. Simplification uses vertex clustering. It may change topology and remove details; the original remains available and is always used for analysis. STL files have no unit metadata; exports preserve source coordinates and units.