How to add a custom observable to the scene?

enquel · August 20, 2020, 12:25pm

I am perfectly able to create and use a custom observable for a mesh, but not for a scene. Is this a bug or a feature?

Evgeni_Popov · August 20, 2020, 4:10pm

Could you provide a repro in the PG (even if it fails), as I’m not sure to fully understand your request?

brianzinn · August 20, 2020, 4:51pm

Have a look here how a custom observable was added to Scene for physics. It’s patched to scene prototype (there is code lower down also for AbstractMesh). Is this how you are doing it?

github.com

BabylonJS/Babylon.js/blob/master/src/Physics/physicsEngineComponent.ts#L136


Scene.prototype.deleteCompoundImpostor = function(compound: any): void {

    var mesh: AbstractMesh = compound.parts[0].mesh;



    if (mesh.physicsImpostor) {

        mesh.physicsImpostor.dispose(/*true*/);

        mesh.physicsImpostor = null;

    }

};



/** @hidden */

Scene.prototype._advancePhysicsEngineStep = function(step: number) {

    if (this._physicsEngine) {

        let subTime = this._physicsEngine.getSubTimeStep();

        if (subTime > 0) {

            this._physicsTimeAccumulator += step;

            while (this._physicsTimeAccumulator > subTime) {

                this.onBeforePhysicsObservable.notifyObservers(this);

                this._physicsEngine._step(subTime / 1000);

                this.onAfterPhysicsObservable.notifyObservers(this);

                this._physicsTimeAccumulator -= subTime;

            }

enquel · August 21, 2020, 7:47am

@Evgeni_Popov @brianzinn Guys, thank you for assistance. My TS knowledge is still at its infancy, and probably that’s the source of trouble. All is good now, I have that custom observable working, I believe I was missing the observable name before notifyObservers() method.

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How to add a custom observable to the scene?

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