Looking for advice on how to connect Metadata to my three.js geometries. Since there is no direct Attribute available in the Object, what would be the most effective method for linking this data?
Looking for advice on how to connect Metadata to my three.js geometries. Since there is no direct Attribute available in the Object, what would be the most effective method for linking this data?
If you want to keep track of user information, the Object.userData object is a great way to do so.
update: Keep in mind that Geometries do not support userData...
However, userData can still serve its purpose and will be saved in serialization. To work around this limitation, consider implementing something like
myScene.userData.geometryMetas={}
and then fill myScene.userData.geometryMetas[geometry.uuid]=YourMetaData
There are three approaches you can take.
To quickly add the Attribute property directly to the three.js object, use this method:
var myGeom = new THREE.Geometry();
myGeom.Attributes = Metadata;
While this method is fast and simple, it comes with drawbacks such as being hacky and somewhat fragile (typical of monkey patching), and the metadata won't be included in the Geometry's toJSON() method, which may or may not be desired.
Alternatively, wrapping the geometry in a new object with its own Attributes property offers another option. You can create a plain object like this:
var myGeom = {
geometry: new THREE.Geometry(),
attributes: Metadata
};
Or opt for using a constructor:
function MyGeom(geometry, attributes) {
this.geometry = geometry;
this.attributes = attributes;
}
var myGeom = new MyGeom(new THREE.Geometry, Metadata);
The downside here is that you'll need to handle wrapped objects instead of straightforward THREE.Geometry instances, which involves unwrapping them when interacting with the Three.js API and re-wrapping any data obtained from it.
If you prefer keeping attribute data separate from geometries, you can utilize each THREE.Geometry object's unique uuid property. By using this uuid as a key in a dedicated metadata object, you can work with regular Three.js objects like so:
var AllMetadata = {}; // Global or project namespace assignment
var myGeom = new THREE.Geometry();
AllMetadata[myGeom.uuid] = Metadata;
This approach allows you to avoid carrying attribute data along with geometries needlessly, while still having it accessible when required.
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