KHR_interactivity doesn't work with AssetContainers

Bugs
, ,
1

Hello!

I’m trying to implement a viewer able to load several GLTF models and add/remove them into scene.

The KHR_interactivity only works when assets are immediately loaded into scene, but not when they’re loaded into AssetContainer and then added to scene.

Apparently, that’s because extension’s KHR_interactivity.onReady immediately creates and starts FlowGraphCoordinator even before assets are actually added into scene.

2

cc @bghgary @srzerbetto

3

P.S.

Also, the AssectContainer is not aware of FlowGraphs at all.

5

Thanks for the report! We will investigate this when we work on the interactivity implementation in a few weeks. Let us know if this is urgent for you for some reason.

1 Like
7

@bghgary

Ok, i see the problem: the FlowGraphs cannot be deactivated, but only disposed.
So they should be recreated every time corresponding assets are added to the scene.
That seems like a big mess when assets are added individually.

Anyway, I’d suggest some API similar to the KHR_materials_variants.
At least it should work fine when gltf models are added/removed in whole.

interface FlowGraphController {
    activate(); // or something
    deactivate();
}

async function LoadMyModel(url) { 

    const model = new MyModel(); // extends AbstractAssetContainer or something

    const options = deepMerge(GLTFOPTIONS, {
        extensionOptions: {
            KHR_materials_variants: {
                onLoaded: (ctrl: MaterialVariantsController) => model.materialCtrl = ctrl
            },
            KHR_interactivity: {
                onLoaded: (ctrl: FlowGraphController) => model.flowCtrl = ctrl
            }
        },
    });

    
    ... 
}

function attachMyModel(model: MyModel) {
    model.addAllToScene();
    model.flowCtrl.activate();
}

function detachMyModel(model: MyModel) {
    model.flowCtrl.deactivate();
    model.removeAllFromScene();
}