Dynamically Loaded Entity Models

Through some experimentation I found that it is possible to load entity models designed for use with GeckoLib post initialization. This is useful if the player were to join a server which sends the model information in a packet (normally you would need to trigger a full resource reload process).

Geo JSON Loading

All you need is the parsed JsonObject representing your geo model.

try {
    RawGeoModel rawModel = Converter.fromJsonString(geo.toString());
    if (rawModel.getFormatVersion() != FormatVersion.VERSION_1_12_0) {
        throw new RuntimeException(identifier.getPath() + " : Wrong geometry json version, expected 1.12.0");
    }

    RawGeometryTree rawGeometryTree = RawGeometryTree.parseHierarchy(rawModel);
    GeckoLibCache.getInstance().getGeoModels().put(identifier, GeoBuilder.constructGeoModel(rawGeometryTree));
} catch (IOException e) {
    throw new RuntimeException(identifier.getPath() + " : Problem reading geo model.");
}

Animation JSON Loading

Similar to geo model loading, you just need your animation JsonObject as well.

AnimationFile animationFile = new AnimationFile();

for (Map.Entry<String, JsonElement> entry : JsonAnimationUtils.getAnimations(animation)) {
    String animationName = entry.getKey();
    Animation anim;

    try {
        anim = JsonAnimationUtils.deserializeJsonToAnimation(JsonAnimationUtils.getAnimation(animation, animationName), new MolangParser());
        animationFile.putAnimation(animationName, anim);
    } catch (ShaderParseException e) {
        throw new RuntimeException("Could not load animation from quadcopter template: " + animationName);
    }
}

GeckoLibCache.getInstance().getAnimations().put(identifier, animationFile);

Texture Loading

Finally, we load the texture of the entity like so:

MinecraftClient.getInstance().getTextureManager()
    .registerTexture(identifier, new ResourceTexture(identifier));

Note: A custom resource manager and a mixin are required in order for the above code to work. The implementation can be found here.