Stride: [Model] Unable to import GLTF json and GLB binary 3d Model assets

[acampbellb]

Release Type: Official Release/GitHub

Version: 3.2

Platform(s): Windows

Describe the bug
Unable to create a 3D Model asset from a GLTF file (GLTF json form or GLB binary form). The models load without a problem in GLTF viewers, Xenko's Assimp library seems to be the problem. An eaten exception seems to be occurring somewhere w/ in the call to ExtractEntity (see below).
Model attached, you can use this viewer to confirm model as valid https://gltf-viewer.donmccurdy.com/

gltf_model.zip

* Exception *

Index was outside the bounds of the array.

at Xenko.AssimpNet.NetTranslation.Materials.convertAssimpStackCppToCs(aiMaterial* material, aiTextureType type) in C:\xenko\xenko\sources\tools\Xenko.Assimp.Translation\Materials.cpp:line 161

Callstack

Xenko.GameStudio.exe!Xenko.GameStudio.DataBindingExceptionRethrower.FirstChanceExceptionThrown(object sender, System.Runtime.ExceptionServices.FirstChanceExceptionEventArgs e) Line 84
at C:\xenko\xenko\sources\editor\Xenko.GameStudio\DataBindingExceptionRethrower.cs(84)
[External Code]
Xenko.Assimp.Translation.dll!Xenko::AssimpNet::NetTranslation::Materials::convertAssimpStackCppToCs(aiMaterial* material, aiTextureType type) Line 161
at C:\xenko\xenko\sources\tools\Xenko.Assimp.Translation\Materials.cpp(161)
Xenko.Importer.Assimp.dll!Xenko::Importer::AssimpNET::MeshConverter::GenerateOneTextureTypeLayers(aiMaterial* pMat, aiTextureType textureType, int& textureCount, Xenko::Assets::Materials::MaterialAsset^ finalMaterial) Line 741
at C:\xenko\xenko\sources\tools\Xenko.Importer.Assimp\Xenko.Importer.Assimp.cpp(741)
Xenko.Importer.Assimp.dll!Xenko::Importer::AssimpNET::MeshConverter::BuildLayeredSurface(aiMaterial* pMat, bool hasBaseColor, bool hasBaseValue, Xenko::Core::Mathematics::Color4 baseColor, float baseValue, aiTextureType textureType, Xenko::Assets::Materials::MaterialAsset^ finalMaterial) Line 897
at C:\xenko\xenko\sources\tools\Xenko.Importer.Assimp\Xenko.Importer.Assimp.cpp(897)
Xenko.Importer.Assimp.dll!Xenko::Importer::AssimpNET::MeshConverter::ProcessMeshMaterial(aiMaterial* pMaterial) Line 1085
at C:\xenko\xenko\sources\tools\Xenko.Importer.Assimp\Xenko.Importer.Assimp.cpp(1085)
Xenko.Importer.Assimp.dll!Xenko::Importer::AssimpNET::MeshConverter::ExtractMaterials(aiScene* scene, std::map,std::allocator >,std::less,std::allocator,std::allocator > > > >& materialNames) Line 1305
at C:\xenko\xenko\sources\tools\Xenko.Importer.Assimp\Xenko.Importer.Assimp.cpp(1305)
Xenko.Importer.Assimp.dll!Xenko::Importer::AssimpNET::MeshConverter::ExtractEntity(System::String^ inputFilename, System::String^ outputFilename, bool extractTextureDependencies) Line 1477
at C:\xenko\xenko\sources\tools\Xenko.Importer.Assimp\Xenko.Importer.Assimp.cpp(1477)
Xenko.Assets.Models.dll!Xenko.Assets.Models.AssimpAssetImporter.GetEntityInfo(Xenko.Core.IO.UFile localPath, Xenko.Core.Diagnostics.Logger logger, Xenko.Core.Assets.AssetImporterParameters importParameters) Line 36
at C:\xenko\xenko\sources\engine\Xenko.Assets.Models\AssimpAssetImporter.cs(36)
Xenko.Assets.Models.dll!Xenko.Assets.Models.ModelAssetImporter.Import(Xenko.Core.IO.UFile localPath, Xenko.Core.Assets.AssetImporterParameters importParameters) Line 70
at C:\xenko\xenko\sources\engine\Xenko.Assets.Models\ModelAssetImporter.cs(70)
Xenko.Assets.Presentation.dll!Xenko.Assets.Presentation.Templates.ModelFromFileTemplateGenerator.CreateAssets(Xenko.Core.Assets.Templates.AssetTemplateGeneratorParameters parameters) Line 130
at C:\xenko\xenko\sources\editor\Xenko.Assets.Presentation\Templates\ModelFromFileTemplateGenerator.cs(130)
Xenko.Assets.Presentation.dll!Xenko.Assets.Presentation.Templates.AssetTemplateGenerator.Run(Xenko.Core.Assets.Templates.AssetTemplateGeneratorParameters parameters) Line 32
at C:\xenko\xenko\sources\editor\Xenko.Assets.Presentation\Templates\AssetTemplateGenerator.cs(32)
Xenko.Core.Assets.Editor.dll!Xenko.Core.Assets.Editor.Components.TemplateDescriptions.TemplateGeneratorHelper.RunTemplateGeneratorSafe.AnonymousMethod__0() Line 56
at C:\xenko\xenko\sources\editor\Xenko.Core.Assets.Editor\Components\TemplateDescriptions\TemplateGeneratorHelper.cs(56)
[External Code]

To Reproduce
Steps to reproduce the behavior:

1. Add 3D Model asset
2. Select GLB file (GLTF binary form)
3. Accept default options
4. Click OK

Expected behavior
3D Model asset is created.

[aurodev]

Is gltf fully supported yet? see: #96 #458

[tebjan]

Xenko supports whatever Assimp 4.1 supports. I think it's missing a few special GLTF format variations, but there are easy to use tools, that convert model formats. so you can just convert it to a format that works.

[acampbellb]

Doesn't work w/ straight GLTF (JSON), or GLB. Forced to use FBX, argh!

[vpenades]

Hi, I would humbly propose to use my library, SharpGLTF for glTF model importing.

@tebjan suggested me here to do the Stride integration myself, but I'm full hands with the MonoGame integration, which is the engine I do know, so I cannot do the Stride integration myself. I would be able to answer any technical question you may have.

[ykafia]

Will work on this issue for now.
Some questions (for Stride's devs):

• Should Gltf be able to load scenes or just focus on loading models ?
• What would you think of making Assimp + Fbx optional (if possible) dependencies once Gltf is supported ? One pro would be less cpp dependencies

[vpenades]

@ykafia regarding loading scenes or models.... there's a reason why glTF supports multiple scenes, and it is _resource sharing_

I'll give two examples:

1- Imagine you have the scene of a castle, divided in many rooms. A lot of the rooms will reuse many meshes... so you can have a single glTF for the whole castle, and each "scene" is a room. So you can control which room is being rendered, but the meshes will be shared between rooms.

2- Imagine a spaceship model: scene 0 is a brand new ship, scene 1 is the same ship with some hull damage, scene 2 is the same ship completely destroyed. In this case, some spaceship parts can be reused between scenes

In all cases, it's all about saving memory for vertex/index buffers and textures.