createInstance creates an invisible instance of mesh

peterimg · August 25, 2025, 3:54pm

I did try that it did not worked. I also notice that I can close the inspector and they will show up.

So select mesh in inspector that is invisible to show the gizmo ( any gizmo: move, rotate, scale), and after close the inspector.

Gizmo dissapear meshes show up.

What is interesting, if i turn on edge rendering the meshes receive the outlines.

I was thinking it was also my nodeMaterial and uses of instances and bones, But when they show up they work fine. So shader works.

Literally the strangest bug ever for me. Never was stuck for so long.

Any other suggestions?

Regards
Peter

Evgeni_Popov · August 25, 2025, 5:08pm

Try using a standard material rather than a node material and see if that resolves the issue. This could give us some avenues to explore.

peterimg · August 25, 2025, 5:27pm

@Evgeni_Popov

I just noticed that I have also another way to make it work:

Open Inspector. Select any Skeleton from my scene. Turn on Debug. And turn it off.

The meshes showing up.

Something is triggered on them that makes reaper.

peterimg · August 25, 2025, 5:30pm

Hi @Evgeni_Popov

Standard Material does exactly the same thing. No changes.

peterimg · August 25, 2025, 6:59pm

Hi @Evgeni_Popov

OK I triggered Inspector Skeleton debugging by code and all its working fine now.

const skeletonView = new SkeletonViewer(scene.skeletons[0],null,scene);
skeletonView.dispose();

What is this code triggering on skeletons that makes them update and show again ?

Regards
Peter

Evgeni_Popov · August 26, 2025, 6:39am

The code is here:

github.com/BabylonJS/Babylon.js

packages/dev/core/src/Debug/skeletonViewer.ts

master


      
          constructor(

              /** defines the skeleton to render */

              public skeleton: Skeleton,

              /** defines the mesh attached to the skeleton */

              public mesh: Nullable<AbstractMesh>,

              /** The Scene scope*/

              scene: Scene,

              /** [true] defines a boolean indicating if bones matrices must be forced to update before rendering (true by default)  */

              public autoUpdateBonesMatrices: boolean = true,

              /** [3] defines the rendering group id to use with the viewer */

              public renderingGroupId: number = 3,

              /** [Object] is the options for the viewer */

              public options: Partial<ISkeletonViewerOptions> = {}

          ) {

              this._scene = scene;

              this._ready = false;

          

              //Defaults

              options.pauseAnimations = options.pauseAnimations ?? true;

              options.returnToRest = options.returnToRest ?? false;

This file has been truncated. show original

You can try calling computeAbsoluteMatrices() on the skeleton (that’s what _displayLinesUpdate does).

peterimg · August 26, 2025, 8:42am

Hi @Evgeni_Popov

I did that. But its the disposing() of it that makes it show up.

So what is done with the dispose that could make it?

Evgeni_Popov · August 26, 2025, 10:23am

dispose is just disposing of the debug mesh and the utility layer:

github.com/BabylonJS/Babylon.js

packages/dev/core/src/Debug/skeletonViewer.ts

master


      
          public dispose(): void {

              this.isEnabled = false;

              if (this._debugMesh) {

                  this._debugMesh.dispose();

                  this._debugMesh = null;

              }

          

              if (this._utilityLayer) {

                  this._utilityLayer.dispose();

                  this._utilityLayer = null;

              }

          

              this.ready = false;

          }

So I really don’t know what your problem could be…

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createInstance creates an invisible instance of mesh

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