Spatial sound: Sound does not follow a TransformNode, but a Mesh

Joerg_Plewe · May 10, 2020, 9:17pm

Hi all!

Moving around a TransformNode that is attached to a Sound does not deliver the expected attenuation by distance from the camera. It works with a Mesh though.

Demo: https://www.babylonjs-playground.com/#EDVU95#24

My misunderstanding of the API??

. J

Gijs · May 10, 2020, 10:23pm

It’s not you, apparently Sound still expects a mesh here:

github.com

BabylonJS/Babylon.js/blob/6aa6cb2498bc719a5f4b13c1b3f19fcd557f97a4/src/Audio/sound.ts#L939


 * @see http://doc.babylonjs.com/how_to/playing_sounds_and_music#attaching-a-sound-to-a-mesh

 */

public detachFromMesh() {

    if (this._connectedTransformNode && this._registerFunc) {

        this._connectedTransformNode.unregisterAfterWorldMatrixUpdate(this._registerFunc);

        this._registerFunc = null;

        this._connectedTransformNode = null;

    }

}



private _onRegisterAfterWorldMatrixUpdate(node: TransformNode): void {

    if (!(<any>node).getBoundingInfo) {

        return;

    }

    let mesh = node as AbstractMesh;

    if (this._positionInEmitterSpace) {

        mesh.worldMatrixFromCache.invertToRef(TmpVectors.Matrix[0]);

        this.setPosition(TmpVectors.Matrix[0].getTranslation());

    }

    else {

        let boundingInfo = mesh.getBoundingInfo();

Here is a playground with the original _onRegisterAfterWorldMatrixUpdate commented out, and a modified version that fixes the bug:

https://www.babylonjs-playground.com/#EDVU95#26

Gijs · May 10, 2020, 10:48pm

And a PR:

Deltakosh · May 11, 2020, 3:35pm

Thanks a lot!

Topic		Replies	Views
I USE THE attachToMesh BUT DİDNT WORK Questions documentation , material , mesh	3	559	March 10, 2022
Attaching audio to a mesh seems to be broken in latest Bugs	5	319	November 22, 2021
What is the expected behavior when I detach sound from a mesh? Questions audio	7	373	July 14, 2023
AudioEngineV2 - How to attach sound to mesh in a new way Questions audio , sound	21	251	March 14, 2025
Spatial Sound When Camera Is A Child Questions	8	928	June 26, 2019

Spatial sound: Sound does not follow a TransformNode, but a Mesh

Related topics