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Placing every object in a growing Three.js library by editing coordinates, reloading the scene, and walking over to inspect the result became a cumbersome loop. Mika Flowers’s answer was to record locations from inside the world: walk to a spot, drop a marker, and use the captured position and rotation to place an asset. The markers were persistent Sanity documents, keeping layout notes in the project’s existing information flow rather than making a separate level editor the source of truth.
Why a 3D library needed a layout tool
Flowers describes the environment as a physical interpretation of the project’s information architecture: rooms represent categories, shelves represent collections, and books represent articles. The setting was intended to help explain why information belonged in particular places. A cyber-city aesthetic might have looked appealing, but it did not communicate those relationships as clearly.
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That design decision turned into a placement problem. As the library grew to include architectural pieces, shelves, tables, chairs, rugs, plants, signs, lighting, room entrances, and collision boundaries, manually positioning each item in code became harder to manage.
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What was wrong with editing coordinates by hand?
In the early workflow, Flowers cloned loaded GLB assets and set their position, scale, and rotation with a Three.js helper. When an object needed to move, the process was to change its coordinates, save, reload, then travel through the scene to see whether the placement worked. The author identifies this repeated edit-and-inspect cycle as the friction that accumulated as the environment expanded.
The problem was not that coordinates are inherently unsuitable for 3D scenes. It was that the desired placement was visible in the world, while the author had to infer its numeric representation outside the world. Flowers put the motivation simply: “I could use the room itself to produce the numbers.”
How the in-world marker workflow works
- Go to the intended location. Navigate through the library to where an asset should sit.
- Drop a marker. Record the desired location from within the scene rather than estimating coordinates from a code view.
- Capture placement data. The marker records position and rotation for later use in asset placement.
- Keep a persistent note. Flowers reports storing markers as Sanity documents with persistent IDs, so the notes survive refreshes and can be revisited.
- Export the layout data. The post shows an export format named
oniria-library-layout-pins-v1.
The example marker fields include a label, room slot, district, x/y/z position, and yaw. Those fields suggest a practical link between a physical place in the scene and the library’s organizational structure; the post does not provide a complete schema or specify how every field is consumed.
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1Scan for outdated or missing drivers - takes under a minute2Repair Windows errors before they cause bigger problems3Fix the driver behind crashes, sound loss and screen glitchesFlowers’s principle is: “If I’m standing somewhere in the world and think, "this object should go here," I should be able to record it here.”
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Code placement versus surveying the scene
| Question | Manual code placement | In-world markers in Oniria |
|---|---|---|
| Where is a placement chosen? | By editing numeric transform values in code. | By navigating to the intended location in the scene and recording it. |
| How does the author inspect a change? | Save, reload, and travel through the world to check the result, as Flowers describes the earlier workflow. | The marker records the surveyed location for use in placement; the post does not document an automatic live preview or round-trip update. |
| How are layout notes retained? | As code edits in the existing workflow. | As Sanity documents with persistent IDs, with an export format shown in the post. |
| Where does layout authoring sit? | In code-owned scene placement. | Inside Oniria’s project-specific workflow connecting its content organization to Three.js placements. |
This is a comparison of the workflows Flowers reports, not a measured performance or accuracy test. The account does not establish that the marker tool is faster, more precise, or better suited to other projects.
What the devlog establishes—and what it leaves open
The article describes a custom authoring workflow, but it does not answer several implementation questions a team might need to resolve before adopting a similar design:
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- Whether marker data is loaded at runtime or baked into a build.
- How captured transforms are written back to the code-owned scene graph, or whether that happens automatically.
- Whether exported layout data remains easy to review in version control.
- Whether markers support grid snapping, collision checks, or bounds validation.
The post also mentions searchable shelves and dynamic slots without explaining their data schema or search behavior. Those features should not be taken as evidence that the marker tool provides a particular search system or placement-validation capability.
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A scene-based marker workflow is worth considering when the intended location is easier to identify visually than numerically, and when layout choices need context such as a room, district, or shelf slot. It can keep the act of surveying a position close to the place where that position matters.
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It is not automatically a replacement for a general-purpose editor. Three.js’s official site lists its editor and learning resources; the choice Flowers describes is narrower: a custom tool designed around Oniria’s relationship between DEV articles, districts, rooms, shelf slots, and Three.js placement. A team considering this pattern should decide separately how exported data is validated, reviewed, and applied to the scene.
Further Three.js learning
For readers who want background on scene setup and transforms, Discover three.js explains how to use its online book, which includes a live editor and covers topics such as transforms, lighting, cameras, and loading models. Three.js Journey lists lessons on transforms, debug UI, model loading, and game creation.
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