How to add an extension to Animation.Channel.Target (KHR_animation_pointer)

[marwie]

Hello,

I'm looking at how to pass through KHR_animation data written to animations[i].channels[n].target.extensions.

I'm not sure how to correctly set an extension on a channel target. It looks like there is currently no support for that? (docs)

Something like:

function read(context){
    
    context.jsonDoc.json.animations?.forEach((animDef, index) => {
        animDef.channels.forEach((channel, channelIndex) => {
            const animation = context.animations[index];
            const animationChannel = animation.channels[channelIndex];
            
            const target = channel.target;
            const extensionDef = target.extensions && target.extensions[EXTENSION_NAME];
            const extension = this.document.createExtension(OpaqueExtension);
            const ext = extension.create(extensionDef, context);
            animationChannel.target.setExtension(EXTENSION_NAME, ext); // < setting the extension on the target
        });
    });
}

Thanks!

[donmccurdy]

The AnimationChannel class inlines "target.path" and "target.node" into the class as "targetPath" and "targetNode", so I think it'd make sense to attach this extension to the channel. It can still write to the target object when serialized to JSON.