The rendering result is NOT correct when multiple meshes is included within the same GLTF file!

[HanetakaChou]

I try to use this GLTF file, and I get the following result.

When I debug the code, I realize that the same index buffer may be shared by different skinned meshes.
Scene::CreateMeshBuffers

 // ...

 for (const auto& skinnedInstance : m_SceneGraph->GetSkinnedMeshInstances())
    {
        const auto& skinnedMesh = skinnedInstance->GetMesh();

        if (!skinnedMesh->buffers)
        {
            skinnedMesh->buffers = std::make_shared<BufferGroup>();

            uint32_t totalVertices = skinnedMesh->totalVertices;

            skinnedMesh->buffers->indexBuffer = skinnedInstance->GetPrototypeMesh()->buffers->indexBuffer;
            skinnedMesh->buffers->indexBufferDescriptor = skinnedInstance->GetPrototypeMesh()->buffers->indexBufferDescriptor;

 // ...

This means that the index offset should NOT be omitted when we create the skinned mesh.
SkinnedMeshInstance::SkinnedMeshInstance

// ...

SkinnedMeshInstance::SkinnedMeshInstance(std::shared_ptr<SceneTypeFactory> sceneTypeFactory, std::shared_ptr<MeshInfo> prototypeMesh)
    : MeshInstance(nullptr)
    , m_SceneTypeFactory(sceneTypeFactory)
{
    m_PrototypeMesh = std::move(prototypeMesh);
    
    auto skinnedMesh = m_SceneTypeFactory->CreateMesh();
    skinnedMesh->skinPrototype = m_PrototypeMesh;
    skinnedMesh->name = m_PrototypeMesh->name;
    skinnedMesh->objectSpaceBounds = m_PrototypeMesh->objectSpaceBounds;
    // ** This line is what I add!
    skinnedMesh->indexOffset = m_PrototypeMesh->indexOffset;
    // **
    skinnedMesh->totalVertices = m_PrototypeMesh->totalVertices;
    skinnedMesh->totalIndices = m_PrototypeMesh->totalIndices;
    skinnedMesh->geometries.reserve(m_PrototypeMesh->geometries.size());

// ...    

[HanetakaChou]

@apanteleev One Pull Request has been created!