Ilia Sidorov — development logs

HybridDesign: Display quality that never leaks into a file

Tue, 22 Sep 2026 12:00:00 +0000

Heavy parts are drawn coarse while you edit and exact when idle; that temporary setting is now never written into the document.

A file damaged by the old behaviour is repaired when it opens
The progress window for long opens keeps its timing under load
A GUI test suite built on the structure of a real working file

HybridDesign: A smoother viewport on heavy assemblies

Mon, 21 Sep 2026 12:00:00 +0000

Orbit picks its pivot without a stall: last preselection first, an exact pick only when it is cheap
Hover highlighting picks only where the cursor rests, never while a button is held
One frame per recompute instead of repainting in the middle of it
Render cache pinned only for parts up to 100 k triangles; heavier ones stay automatic
A fillet survives when its edge is made longer and FreeCAD loses the edge mapping

HybridDesign: Viewport and panels: 177 commits in a day

Sun, 20 Sep 2026 12:00:00 +0000

Two-stage display for heavy parts, with a mesh cache on disk
Section view with hatching by the drafting standards and a live drag
Horizon levelling, zoom clamp, a pastel palette shared by all bodies
Picks keep their identity in Offset Face, Press Pull, Draft and the panels
Fillet shows its preview first, and every row keeps its own edge
FreeCAD's console output became an acceptance check: a run with new warnings fails

HybridDesign: Press Pull on a real model: up to 12× faster preview

Wed, 16 Sep 2026 12:00:00 +0000

On the lithograph's VR6 axis model (132 objects) most of the Pull latency went into building the coloured preview. The preview now reuses the regions the offset already built.

Preview	Before, s	After, s	Speed-up
Rail face, +0.1 mm	8.05	0.67	12×
Top plate face (244 faces), +0.1 mm	7.38	1.93	3.8×
Hole wall, −0.1 mm	7.86	0.66	12×
Distance input to status	0.433	0.012	38×

A 5000-object scene: clean recompute 7 ms, input to finished Press Pull preview 0.38 s. After: median of three runs.

HybridDesign: Its own icons, a render cache, Press Pull next to fillets

Tue, 15 Sep 2026 12:00:00 +0000

106 command icons redrawn; every colour greys out when a command is disabled
Coin render cache on every part, and HybridDesign's first Preferences page
A progress window while a file opens or imports
Press Pull on faces next to fillets: offset them together or keep the fillet radius

HybridDesign: Imports, themes and Fusion's layout grid

Mon, 14 Sep 2026 12:00:00 +0000

Imported STEP parts, primitives and links work in every body command
Extrude from any sketch region, a Revolve panel, pieces become bodies
Live previews for patterns, Mirror and construction planes
Fusion's layout grid in every 3D view; Material 3 light and dark themes

Screen recording from that day, played at ×2.

HybridDesign: A real ribbon

Fri, 11 Sep 2026 12:00:00 +0000

Tabs, panels, big icons with labels, overflow per panel
The sketch hides after the operation that used it, as in Fusion
References between bodies stay live in both directions
A cylinder seam in the way is moved instead of failing the feature
GUI tests run offscreen, so a test run never takes over the desktop

HybridDesign: Day one: the spec and the operations layer

Thu, 10 Sep 2026 12:00:00 +0000

Design specification, package skeleton, headless test runner and GUI harness
Extrude and Revolve with directions, cuts across several bodies
Holes with threads and counterbores, Combine
Joints with Fusion's types, limits and offsets; as-built joints