v0.1.0-dev.20261001

What changed

Added

• Mesh to solid. The Recognise tool turns an imported mesh into a body: exact surfaces (planes,
  cylinders, cones, spheres, tori, thread and spring faces, smooth free-form walls) or the mesh as it is,
  a polyhedron.
• Simplify a mesh. A heavy mesh is made lighter within a set deviation before it becomes a body; the tool
  warns when a mesh is heavy and suggests the value.
• New file formats. IGES, OBJ, PLY, glTF, 3MF and AMF, read and written. One Import… command for all of
  them, one Export submenu.
• Imports keep their structure. STEP, IGES, glTF, 3MF, AMF and STL come in as an assembly tree with part
  names, positions and the author's colours, down to single faces; repeated parts come in as one part used
  several times.
• Units and scale on import, changeable later from the imported file's node.
• Export keeps the structure too: STEP, glTF and 3MF are written as an assembly tree with names, positions
  and colours.
• Assembly: a clone of a part (the same part again, not a copy), a component pattern (linear in up to
  three directions, circular about a picked axis), a mirrored copy of a part.
• Part: the pieces a cut leaves are bodies of one part, and Make Part moves one into a part of its own;
  Offset Surface; a face replaced by a sheet stretches its neighbours to it.
• Sketch: text in any installed font, with a font window (search and preview); dimension text placement
  and style in Settings.
• View: mouse layouts that follow the programs they are named after (3D and sketch), a layout for a pen,
  box selection in 3D, highlight under the cursor, "look at point".
• Faster rebuilds: a rebuild computes independent nodes on several cores (how many is a setting); the scene
  draws large models with less memory.
• First start opens a sample; afterwards the last project opens.

Fixed

• More than 150 faults found by working through the program by hand: every tool takes what was selected
  before it, lets a pick go on a second click, and says in words why a value is refused instead of clamping it.
• Previews for revolve, fillet, chamfer, hole and draft show what Enter will build.
• One action is one undo step, named after the tool.
• A node that fails keeps its reason, also after saving and opening again.
• Cancel stops a long rebuild at once and takes back the change it was computing.
• A chamfer on a body made from a mesh no longer closes the program.
• Opening STEP and IGES at the same time no longer closes the program; a large IGES opens in about a minute.

Changed

• All settings and data are kept in one folder.
• File -> New Project starts an empty assembly.

Known limits

The document format changes with no backward compatibility; convert_qcad.py brings older files forward.
Recognising a mesh: smooth rounded walls come out in several faces with visible seams between them.
The CNC (CAM) module is groundwork and does not work yet. There is no Intel macOS build.

Full Changelog: v0.1.0-dev.20260910...v0.1.0-dev.20261001