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