Error in obtaining indices for gltf's mesh

brightMoon · October 25, 2024, 6:18pm

This mesh calls the getTotalIndices function to get 0.

HiGreg · October 25, 2024, 6:33pm

Is it unindexed? mesh.isUnIndexed should confirm.

roland · October 26, 2024, 1:27am

Yes, that’s the case here.

brightMoon · October 26, 2024, 9:15am

I want to get the number of faces of the mesh now. Since getTotalIndices() is 0, can I use getTotalVertice()/3? So the number of statistical surfaces of the inspector needs to be modified

roland · October 26, 2024, 12:48pm

I believe this question could be easily answered by yourself

Maybe you could try: mesh.getVerticesData(BABYLON.VertexBuffer.PositionKind).length / 3

EDIT:
Sorry, I missread your question w/o glasses LOL

I’ve read: Since getTotalIndices() is 0, can I use getTotalIndices()/3 and since getTotalIndices returns 0 you couldn’t use it. That’s why the smiley…

SO yes, you can use getTotalVertices()

brightMoon · October 26, 2024, 1:33pm

Yes, I think so too.

github.com

BabylonJS/Babylon.js/blob/650c1f71f4b6f850fbd3bc078dc659e5144cc58f/packages/dev/inspector/src/components/actionTabs/tabs/statisticsTabComponent.tsx#L81


      
          

          return (

              <div className="pane">

                  <TextLineComponent label="Version" value={Engine.Version} color="rgb(113, 159, 255)" />

                  <ValueLineComponent label="FPS" value={engine.getFps()} fractionDigits={0} />

                  <PerformanceViewerComponent scene={scene} />

                  <LineContainerComponent title="COUNT">

                      <TextLineComponent label="Total meshes" value={scene.meshes.length.toString()} />

                      <TextLineComponent label="Active meshes" value={scene.getActiveMeshes().length.toString()} />

                      <TextLineComponent label="Active indices" value={scene.getActiveIndices().toString()} />

                      <TextLineComponent label="Active faces" value={(scene.getActiveIndices() / 3).toString()} />

                      <TextLineComponent label="Active bones" value={scene.getActiveBones().toString()} />

                      <TextLineComponent label="Active particles" value={scene.getActiveParticles().toString()} />

                      <TextLineComponent label="Draw calls" value={sceneInstrumentation.drawCallsCounter.current.toString()} />

                      <TextLineComponent label="Total lights" value={scene.lights.length.toString()} />

                      <TextLineComponent label="Total vertices" value={scene.getTotalVertices().toString()} />

                      <TextLineComponent label="Total materials" value={scene.materials.length.toString()} />

                      <TextLineComponent label="Total textures" value={scene.textures.length.toString()} />

                  </LineContainerComponent>

                  <LineContainerComponent title="FRAME STEPS DURATION">

                      <ValueLineComponent label="Absolute FPS" value={1000.0 / this._sceneInstrumentation!.frameTimeCounter.lastSecAverage} fractionDigits={0} />

Can you help with PR repair for this

roland · October 26, 2024, 2:21pm

I am not sure if it is a good idea to change it here. Because we don’t have a getActiveFaces() function available only getTotalFaces() and the inspector displays the active count. getTotalFaces() returns inactive faces too.

So this is not a simple PR changing only one function and we should discuss this with the team. Let’s wait until Monday.

brightMoon · October 26, 2024, 2:40pm

Yes, I think we need to traverse scene.meshs.
Okay, I’ll wait

Deltakosh · October 28, 2024, 3:03pm

Yeah I’m not super keen on it honestly. Why not adding your own extension to the inspector?

Adding more code to the scene will simply bloat it whereas that data can be found with existing code.

At the very least, I would be ok to have the info displayed in the inspector BUT not added to the scene

brightMoon · October 28, 2024, 4:54pm

Yes, it’s better to fix it in the inspector. Then this method can be used elsewhere for reference.

Roughly speaking, it is:

let vexterCount = 0;
let meshs = scene.getActiveMeshes();
meshs.forEach(itemMesh=>{
    if(itemMesh.isUnIndexed ){
        vexterCount += itemMesh.getTotalVertices();
    }else{
        vexterCount += itemMesh.getTotalIndices();
    }
});
let faces = vexterCount / 3;  //Obtain the number of vertices

Can replace scene.getActiveIndices()/3

Deltakosh · October 28, 2024, 5:00pm

I would say in addition to actually instead of replace.
Wanna do a PR?

brightMoon · October 28, 2024, 5:26pm

I can try

Topic		Replies	Views
Vertex List From Blender to Babylon Questions	3	669	May 21, 2022
Detect Faces of mesh Questions	16	559	April 14, 2022
How to get the coordinates or indexes of the points of the Mesh picked up by the mouse Questions	3	1074	April 14, 2022
Texture on custom setVerticesData Questions	2	327	April 14, 2023
Collision problem (bug?) with gltf mesh, without indexes Bugs	6	843	November 3, 2020

Error in obtaining indices for gltf's mesh

Related topics