Roads take sidewalks (none, both, left, right): 12 cm high paving with
kerb faces drawn where they face the viewer. Road curve (radius, angle,
left/right) carries a street round a bend; centre lines are true arcs
when cut and offset, so curve joints are seamless. A road ending on
another road's centre line opens that road's kerb and sidewalk (T
junction); two roads ending at one corner close it. Roundabout: ring
radius and width, one or two lanes, up to four arms with flared kerbs,
splitter islands, give-way lines on the entry side (traffic on the left
or right) and a central island with apron.
Studio: a road run drawn corner by corner gets a curve in each corner
(prefab meta `corner`). Tooltips list the streets each one meets.
Engine: open `polyline` primitive (Prim::Poly open) so dashes run on
round curves. examples/streets and a Streets demo in the web Studio;
MCP guidance, docs. ROADMAP: backlog 5-7 done; multi-select and the
hosted copy marked done.
Tests: Rust 72, Studio 113, web 95.
With Windows "Animation effects" off, browsers report prefers-reduced-motion, and the viewer
turned every animation off and hid the animation button, so presses, belts and robot arms
stood still in Brave and Firefox with no way to start them. Now that preference only picks
the starting mode ("off"); the button stays (its tooltip says why it is off) and the
viewer's choice wins and is remembered. The CSS still-picture rules apply only until the
viewer turns animation on (.iso-anim-on).
Also: switching light -> off -> smooth redraws the scene so the animations paused by script
run again (they ignore CSS play states).
Checks: web 93/93 (reduced motion: starts still, one click runs it, kept after reload),
Studio 109/109, 70 Rust tests. Tried in real Brave (system setting) and Firefox.
- Robot arm (category Industry): picks goods off the end of the nearest conveyor within its reach
and puts them on the start of another conveyor within reach, or on a pallet a quarter turn on
(pick / put: auto or a side). One move per item coming in (cycle 0) or a set cycle; waits while
the line before it stands. The belt it feeds carries its goods at its pace and starts its loop
when they land (feeds carry a time offset `ph`), so arm and belts stay in step.
- Drawn as a 16-pose flipbook: two-link inverse kinematics per pose, each pose shown for a
sixteenth of the cycle by a stepped CSS animation (iso-flip; pose 0 alone when unanimated).
Poses pointing away from the viewer are drawn before the base, the others after it.
- New sprite method beam(a, b, n, w, mat): a square bar between two 3D points, six faces culled
and shaded like face(). Native, so the factory demo renders in 4.7 ms instead of 18.8 ms.
- Factory demo: a palletiser at the end of the carton line, a loading robot passing drums from the
incline onto the loading belt into the truck. MCP instructions on robot arms.
Checks: 70 Rust tests (arms and belts in step, waiting arm, beam faces from every side),
Studio 109/109, web 90/90.
- Producer (category Industry): a press making cartons, crates, drums, sacks or parts at a set
rate per minute; its ram goes down once per item, a green / red light shows running / stopped.
- Conveyor: drawn the way it runs (new prefab meta `directed`: the Studio turns the piece from
where the drag starts), belt width, height, rise (inclines), speed, goods and spacing; legs,
rails and a drive motor. Corners join without overlap (the receiving belt runs through, the
feeding one stops at its side).
- A conveyor starting on a producer's output side carries its goods at its rate; one starting at
another's end carries on with what that one carries. The gap is speed / rate. A stopped press or
belt stops the goods after it. Tooltips show speed, rate and source.
- The goods ride a group moving one gap per loop (no reordering), first fading in, last out.
- Script API: world_of(o, u, v), info_row(key, value); objects_on falls back to half of p.d.
- Theme: industry colours, LED colours (the marker's LED had none).
- examples/factory + Factory demo in the web Studio; MCP instructions on production lines.
Checks: 68 Rust tests (conveyor joints, feed and spacing, every view of the factory demo),
Studio 108/108 (draw direction, feed from a producer, rate change), web 89/89.
Measured with the new tools/bench_web.py on the web Studio's house demo, CPU slowed 6x:
- Idle: running CSS animations repainted the whole drawing every frame (99% of the main
thread in a window). Animations now step on about ten times a second by default
("light", 5% idle); the new toolbar button switches light / smooth / off and the browser
remembers it; [build] animation sets the default for built pages; view.animation().
Pan and zoom gestures pause them. Status LEDs pause off-screen and with the rest now.
- Pan 28 -> 10 ms, zoom 69 -> 11 ms per step: gestures move the drawing as one compositor
layer (transform) and set the viewBox once they end; --iso-k is set on the tags group
only and only when it changes; the stage box is read once per frame.
- Hover 22 -> 15 ms per move: the tooltip is placed once per frame on its own layer and
measured only when its text changes; the Studio's x/y readout updates ten times a second
in a contained box; hover work in the Studio runs once per frame.
- Long object lists skip layout of rows out of sight (content-visibility).
- WASM built with opt-level 3: engine render 11.7 -> 9.4 ms for 10% more download.
Checks: Studio 102/102 (animation modes, pan as a layer, contained readout), web 87/87.
House parts (stdlib isokit/house): house_wall drawn along a line, with ends
that adapt at corners, T-junctions and straight runs so no two walls
overlap; window and door that sit on a wall and cut its opening (door
styles panel, glass, double, sliding, opening; swing and hinge by
rotation); floor (boards, tiles, carpet, stone); roof (hip, gable, flat,
optional solar); stairs.
Furniture (stdlib isokit/furniture): chair, sofa / armchair, table with
chairs, desk with monitor and chair, TV, bed, cupboard, bookshelf, kitchen
run, bathtub, shower, toilet, washbasin, plant, rug, floor lamp.
Cut-open levels: on gf / 1f the walls in front of a room are cut low
(rooms are found by their floors), the roof becomes an outline on the
floor, and storeys above are left out. A part's storey comes from z
(storey_h, default 3 m).
Scripting: objects_of, objects_at, objects_on, mount_of, mounted, frame,
to_world, to_local, local_of. Prefab meta: shape (line / rect), mount,
storey.
Studio: drag to draw lines and rectangles (walls, roads, fences, hedges,
floors, areas, buildings, roofs). The Room tool draws a floor plus walls,
without doubling walls that already stand on an edge. Windows and doors
snap onto walls with a hover preview, and they move, turn, copy and
delete with their wall in one undo step. New parts land on the storey
the view shows. Palette categories collapse, and the palette scrolls
apart from the object list.
The MCP instructions explain house building, and list_prefabs shows
sits_on. examples/house is a furnished bungalow; the web Studio gets a
House demo button. Tests: wall corners and junctions, zero depth-sort
cycles in every view, cut levels, and the house demo in every view;
check_studio covers the room / window / door / storey flow, check_web
the House demo.
On isokit.buildfor.life, entering https://inference.p0.contact/v1 in the
agent window's settings made the page call the inference server directly,
which browsers refuse (its nginx answers the CORS preflight with 401):
"The browser could not reach ... (Failed to fetch)".
- the relay meta names its upstream (data-upstream; build_web.py
--agent-upstream, the deploy passes the inference server): that URL now
goes through the relay and is saved as "follow the site's default"
- an unreachable endpoint says what to do: the relay's URL on a site with
one, else isokit studio or isokit.buildfor.life
- check_web.py: relayed upstream and the unreachable message
✦ Agent in the Studio's top bar opens a floating chat window. The model
(any OpenAI-compatible endpoint with tool calling; default B4L's inference
server, https://inference.p0.contact/v1) gets the 15 MCP tools plus two page
tools (select_object, set_view) and the Studio's state (selection, level,
rotation) in its system prompt. Answers and reasoning stream in; tool calls
show as rows with arguments and results; object ids link to the object;
Stop ends a turn; Undo takes the agent's edits back. The window moves by
its title bar and resizes at its top-left corner.
- studio/agent.js: shared by both front ends (waits for studio.js's
isokit:studio event); MCP over /mcp or isokit.mcp in the web Studio
- isokit studio: /api/agent/{config,models,chat} relay the calls on their
own threads (ureq, chunked and flushed per read), so the key stays on the
machine and the endpoint needs no CORS; settings from ISOKIT_LLM_URL /
_KEY / _MODEL or agent.json in the user's config folder
- web Studio: calls the endpoint from the page with a key kept in the
browser; build_web.py --agent-url names a same-site relay as default; the
deploy builds with /llm/v1, which deploy/Caddyfile forwards to the
inference server (its nginx refuses the CORS preflight)
- tools/mock_llm.py + tools/agent_checks.py: the agent window checks in both
check_studio.py and check_web.py
The status bar ends with "isokit <engine version>"; the web build adds
the commit (linked on Gitea), its date as a tooltip and a "+" when built
from a tree with uncommitted changes (build_web.py writes a
<meta name="isokit-build"> from GITHUB_SHA or git). /api/meta now carries
"engine". studio/favicon.svg (isometric cube in the accent green) is
served by `isokit studio` (also on /view) and copied into the web build.
check_web.py and check_studio.py check both.
- isokit-wasm: wasm-bindgen build of the engine; a project in memory behind
the same JSON API as `isokit studio`, plus the MCP tools
- isokit-project: Store trait (FsStore folder, MemStore memory) under a
generic Workspace; Project::from_files; shared Studio API module (api.rs)
used by serve.rs and the WASM build; web_time for clocks in the browser
- studio.js runs on a pluggable backend (window.IsoKitBackend); no Studio
keys while a dialog is open
- web/: projects in IndexedDB, new/demo/delete, zip export/import (stored and
deflated), folder import by drop or picker, folders opened live via File
System Access with outside edits followed, code editor, page build and
preview, two tabs in step, isokit.mcp() and WebMCP registration
- tools/build_web.py -> dist/web (static), tools/check_web.py (44 checks)
grabowski