{"record":{"id":"0e64b8754594094b","repo":"stride3d/stride","slug":"failed-to-get-vertex-bufferdata-for-entity-chunk-entity-name","errorCode":null,"errorMessage":"Failed to get Vertex BufferData for entity {chunk.Entity.Name}'s model.","messagePattern":"Failed to get Vertex BufferData for entity (.+?)'s model\\.","errorType":"exception","errorClass":"Exception","httpStatus":null,"severity":"error","filePath":"sources/engine/Stride.Assets.Models/PrefabModelAssetCompiler.cs","lineNumber":151,"sourceCode":"                                mesh = new MeshData { VertexStride = modelMesh.Draw.VertexBuffers[0].Stride };\n                                meshes.Add(modelMesh.Draw.VertexBuffers[0].Declaration, mesh);\n                            }\n\n                            //vertexes\n                            var vertexBufferRef = AttachedReferenceManager.GetAttachedReference(modelMesh.Draw.VertexBuffers[0].Buffer);\n                            byte[] vertexData;\n                            if (vertexBufferRef.Data != null)\n                            {\n                                vertexData = ((BufferData)vertexBufferRef.Data).Content;\n                            }\n                            else if (!string.IsNullOrEmpty(vertexBufferRef.Url))\n                            {\n                                var dataAsset = manager.Load<Buffer>(vertexBufferRef.Url);\n                                vertexData = dataAsset.GetSerializationData().Content;\n                            }\n                            else\n                            {\n                                throw new Exception($\"Failed to get Vertex BufferData for entity {chunk.Entity.Name}'s model.\");\n                            }\n\n                            //transform the vertexes according to the entity\n                            var vertexDataCopy = vertexData.ToArray();\n                            chunk.Entity.Transform.UpdateWorldMatrix(); //make sure matrix is computed\n                            var worldMatrix = chunk.Entity.Transform.WorldMatrix;\n                            var up = Vector3.Cross(worldMatrix.Right, worldMatrix.Forward);\n                            bool isScalingNegative = Vector3.Dot(worldMatrix.Up, up) < 0.0f;\n\n                            modelMesh.Draw.VertexBuffers[0].TransformBuffer(vertexDataCopy, ref worldMatrix);\n\n                            //add to the big single array\n                            var vertexes = vertexDataCopy\n                                .Skip(modelMesh.Draw.VertexBuffers[0].Offset)\n                                .Take(modelMesh.Draw.VertexBuffers[0].Count*modelMesh.Draw.VertexBuffers[0].Stride)\n                                .ToArray();\n\n                            mesh.VertexData.AddRange(vertexes);","sourceCodeStart":133,"sourceCodeEnd":169,"githubUrl":"https://github.com/stride3d/stride/blob/96fad776d210c221682aac1ccdf4c79dc046fc38/sources/engine/Stride.Assets.Models/PrefabModelAssetCompiler.cs#L133-L169","documentation":"Thrown by the prefab/model asset compiler when a mesh's vertex buffer reference cannot be loaded from the built asset data. The compiler looks up the vertex buffer's URL among the loaded assets and reads its serialized content; when the URL is missing or the buffer asset fails to load, vertexData stays null and this exception aborts the compilation of that entity's model.","triggerScenarios":"ProcessMaterial encounters a mesh whose VertexBuffer reference has no valid URL/index into loaded assets, or manager.Load<Buffer>(vertexBufferRef.Url) returns an asset whose serialization content is unavailable.","commonSituations":"Corrupt or partially migrated model assets (fbx/3ds -> prefab), assets re-imported with a different Stride version so buffer URLs no longer match, deleting or renaming intermediate buffer assets, VCS merges losing asset references.","solutions":["Re-import the affected model asset from its original source file to regenerate buffer data","Clean the asset output/cache directories and rebuild so all intermediate buffer assets are regenerated","Open the prefab/model asset in Game Studio and verify mesh/buffer references are intact; fix broken references","Check which entity the message names and inspect that model's source file for corruption"],"exampleFix":null,"handlingStrategy":"validation","validationCode":"// before compiling, ensure the vertex buffer reference is loadable\nif (chunk.MeshDraw?.VertexBuffers == null || string.IsNullOrEmpty(vertexBufferRef?.Url))\n    throw new InvalidOperationException($\"Entity {chunk.Entity.Name} has no vertex buffer reference; re-import the model.\");","typeGuard":"static bool HasBufferData(Buffer ref buffer) => buffer?.GetSerializationData()?.Content is { Length: > 0 };","tryCatchPattern":"try\n{\n    ProcessMaterial(chunk);\n}\ncatch (Exception ex) when (ex.Message.Contains(\"Failed to get Vertex BufferData\"))\n{\n    logger.Error($\"Re-import model for entity '{chunk.Entity.Name}': {ex.Message}\");\n}","preventionTips":["Re-import model assets after Stride version upgrades","Avoid hand-editing or merge-resolving compiled asset files","Keep source model files in the repo so assets can be regenerated","Clean asset caches when seeing buffer-load failures"],"tags":["assets","models","build-pipeline"],"backgroundTag":"resource-not-found","analyzedSha":"96fad776d210c221682aac1ccdf4c79dc046fc38","analyzedAt":"2026-09-14T02:59:31.279Z","contentChangedAt":"2026-09-14T02:59:31.279Z","schemaVersion":2},"datasetVersion":"2026-09-15T23:17:13.987Z"}