ZeroCAD BRep · M3 · Assembly Projection

1 · Example library

Pick

2 · Canonical document

— not validated —

3 · Export

About these exports

STEP is the canonical exchange format — it carries the analytic BRep (planes, cylinders, cones) and re-opens losslessly in FreeCAD, SolidWorks, Fusion. STL is faceted-mesh-only and is for visual sanity checks. The patent value is in the STEP path; the STL path exists for rendering parity with the parent ZeroCAD mesh build.

4 · Schema notes

Click to expand the working schema

Working M2 schema (cross-checked vs the Patents-3 brief §4.2 and the parent-chat memory note; final reconciliation against the parent-chat zerocad-v5.html deferred to M2.5):

{
  "name": "string",
  "outer_geom": {
    "kind": "block" | "cylinder" |
            "extruded_polygon" | "truncated_cone",
    // block:            x, y, z   (extents, mm)
    // cylinder:         diameter, height
    // extruded_polygon: profile [[x,y],...] CCW closed,
    //                   height
    // truncated_cone:   radius_bottom, radius_top, height
  },
  "features": [
    {
      "id": "f1",
      "kind": "thru_hole|blind_hole|counter_bore|
              counter_sink|pocket|slot|fillet|
              chamfer|boss",
      "position": {"x":0,"y":0,"z":0},
      "axis":     {"x":0,"y":0,"z":1},
      // kind-specific fields documented in code.
    }
  ]
}

Convention: all dimensions in millimetres. Origin at part centre for blocks. Origin at base centre for cylinders / cones, axis along +Z by default. position for a hole = centre of the hole on the entry surface. axis for a hole = direction the hole goes into the part (so for a top-of-block hole, axis is {0,0,-1}).

faces—

tris—

verts—

project—

tess—

features—