Question

I have a problem with JSON format.

I am going to generate a 2D building plan in JSON format automatically. Then this JSON file is loaded to Three.JS for visualization.

Currently, I can easily create various geometry type in JSON format based on:
https://github.com/mrdoob/three.js/wiki/JSON-Model-format-3.1

However, I need to know more about this data format.

• Firstly, how can I add text to the model?
• Secondly, I could not find line as a geometry in this format. Is there?
• Thirdly, is there any document that I can refer to it for more explanation regarding this
  format?
• Lastly, how can I add additional information about geometries
  inside the JSON format? for example when I create a polygon in JSON
  format, I want to add additional information regarding that polygon
  such as area, owner,…

Answer 1

1. Either through a texture, or by creating THREE.TextGeometry and merging that with the other geometry
2. AFAIK, no. You might be able to emulate lines by loading a separate object that you render as wireframe.
3. I’ve used the source code: Loader, JSONLoader
4. I don’t think that’s possible while maintaining compatibility, i.e. you would need to patch Three.js loader.

One option for achieving what you want could be to add custom entries to the JSON, e.g. "lines": [], "customFaceProperties": [] and then parse them yourself once the stock Loader has parsed everything it understands.

Also, since it seems you might be creating something that has different things in it, you might want to take a peek at the scene loading capabilities: example, SceneLoader.js