Error for GLTF file: Failed to produce vertex buffer from mesh set

Questions
#1

Hi!

I have problems with a file I want to export from Blender to Defold - I only want to export selected objects, so a car without wheels (as wheels I want to animate and have them separately, I don’t know why car models don’t have it by default separated :sweat_smile:):

image

But it also happens, when I select everything regarding this particular car:

image
image646×601 44.6 KB

Is it because the meshes for this car are only a part of the whole blender file? (there are different cars and different groups of cars in here)

(It’s from a paid asset pack, so I can send the exported file on DM for investigation)

I’m using this preset to export:

image
image225×956 37.4 KB

And in Editor I have:

image

Could you help me solving the issue?

Is it possible to use multiple materials per model?
#2

Have you checked your model in e.g. glTF Sample Viewer to see if it outputs anything?

You could also install gltf validatorto check the file:

Our code isn’t telling exactly what it expected differently, but it’s good to read the code anyway to get a feel for what it expects:

2 Likes
#3

Thank you! :heart: It’s good to know in the future! :smiley:

The model is though properly imported to gltf sample viewer:

image
image759×326 38.1 KB

Validator says it’s valid:

image

{
"uri": "Muscle_03.glb",
"mimeType": "model/gltf-binary",
"validatorVersion": "2.0.0-dev.3.8",
"validatedAt": "2024-05-11T09:29:17.994Z",
"issues": {
    "numErrors": 0,
    "numWarnings": 0,
    "numInfos": 15,
    "numHints": 0,
    "messages": [
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/0/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/0/primitives/0/attributes/TEXCOORD_1"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/1/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/2/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/2/primitives/0/attributes/TEXCOORD_1"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/3/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/3/primitives/0/attributes/TEXCOORD_1"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/4/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/5/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/6/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/7/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/8/primitives/0/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/8/primitives/0/attributes/TEXCOORD_1"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/8/primitives/1/attributes/TEXCOORD_0"
        },
        {
            "code": "UNUSED_OBJECT",
            "message": "This object may be unused.",
            "severity": 2,
            "pointer": "/meshes/8/primitives/1/attributes/TEXCOORD_1"
        }
    ],
    "truncated": false
},
"info": {
    "version": "2.0",
    "generator": "Khronos glTF Blender I/O v4.0.44",
    "extensionsUsed": [
        "KHR_materials_specular",
        "KHR_materials_ior"
    ],
    "resources": [
        {
            "pointer": "/buffers/0",
            "mimeType": "application/gltf-buffer",
            "storage": "glb",
            "byteLength": 745604
        }
    ],
    "animationCount": 0,
    "materialCount": 1,
    "hasMorphTargets": false,
    "hasSkins": false,
    "hasTextures": false,
    "hasDefaultScene": true,
    "drawCallCount": 10,
    "totalVertexCount": 16824,
    "totalTriangleCount": 8680,
    "maxUVs": 2,
    "maxInfluences": 0,
    "maxAttributes": 5
}
}
#4

After @Pawel’s post I decided to check all my 3D projects and the problem exists. It appeared in Defold 1.8.0. It seems to only show up if the model has a second UV set.

I made an issue - IDE: Model with second UV is not rendered · Issue #8907 · defold/defold · GitHub

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