User-triggered 120x120 = 14400 cells, which produces huge STL/long
renders. Total cells is the right metric (CSG cost scales with count,
not max axis), so cap by N = rows*cols (or rows*(rows+1)/2 for tria
style). 1000 covers any realistic pack (e.g. 20x50) while blocking
accidental misuse.
Backend:
- holder.py: MAX_CELLS env-tunable (default 1000); expected_cell_count
and _check_cell_limit raise ValueError on exceed; both
compute_cells() and render_stl() call it up-front.
- app.py: /api/holder/render now returns 400 on ValueError (not 500)
so the frontend can distinguish bad input from server failure.
/api/holder/params now publishes max_cells alongside the schema.
Frontend:
- holder-app.js: reads max_cells from the params endpoint; status
shows "N cells / over limit (1000)" in red and disables the
Render and "Design busbars" buttons when exceeded.
- holder.css: .topbar-status.over-limit style (red, bold).
- Replace debounced auto-render-on-param-change with an explicit Render
button. Param changes mark the button "dirty" (accent ring); user clicks
Render to drive a render. A Cancel button (AbortController) appears
while a render is in flight.
- Add indeterminate progress bar with elapsed-time counter in the status
panel. Real OpenSCAD --progress streaming can come later.
- Bump OPENSCAD_TIMEOUT default 60s -> 300s and gunicorn --timeout
120s -> 300s. The 60s cap was misclassified by the frontend as
"OpenSCAD not installed" because the error string contained the word
"openscad" -- which the JS matched too greedily.
- Frontend error classifier now distinguishes "binary not found",
"timed out", and "geometry empty" cases and only shows the
install-OpenSCAD hint for the real not-found case.
Server-side OpenSCAD renders STL from bundled hex_cell.scad with parameter
overrides via -D. Frontend is a Three.js viewer with auto-form generated
from /api/holder/params. 'Design busbars →' button posts the computed
cell coordinates to /api/projects and redirects to the busbar editor with
the holder cells pre-loaded.
- holder.py: openscad subprocess wrapper + compute_cells()
(Python mirror of get_hex_center_points_*)
- scad/hex_cell.scad: verbatim copy of Addy/Hex-Cell-Holder source
- app.py: /holder route + /api/holder/{params,render,cells}
- static/holder.html etc: parameter form + Three.js STL viewer
- Dockerfile / install.sh: apt install openscad
- static/index.html: nav link Holder ↔ Busbars in topbar
wenil