stride3d/stride · error · Exception

Failed to get Indices BufferData for entity

Error message

Failed to get Indices BufferData for entity {chunk.Entity.Name}'s model.

What it means

Thrown by the prefab/model asset compiler when an index buffer reference cannot be resolved to loaded buffer data during mesh processing. Without the raw index data the compiler cannot reorder triangles for negative-scale transforms, so it aborts with this message.

Solutions

Re-import the model from its original source to regenerate index buffer data
Clean asset cache/output and rebuild
Verify the asset's index buffer references in Game Studio and repair broken links
Inspect the named entity's source model file for corruption

Defensive patterns

Strategy: validation

Validate before calling

if (string.IsNullOrEmpty(indexBufferRef?.Url))
    throw new InvalidOperationException($"Entity {chunk.Entity.Name} has no index buffer reference; re-import the model.");

Type guard

static bool HasIndexData(Buffer ref buffer) => buffer?.GetSerializationData()?.Content is { Length: > 0 };

Try / catch

try
{
    ProcessMaterial(chunk);
}
catch (Exception ex) when (ex.Message.Contains("Failed to get Indices BufferData"))
{
    logger.Error($"Re-import model for entity '{chunk.Entity.Name}': {ex.Message}");
}

Prevention

Re-import models after engine upgrades
Never manually edit compiled asset intermediates
Regenerate assets from original source files rather than patching
Clean caches when buffer references break after merges

When it happens

Trigger: ProcessMaterial meets a mesh whose IndexBuffer reference URL is missing or whose manager.Load<Buffer>(indexBufferRef.Url) yields no serialized content.

Common situations: Same as vertex-buffer case: stale/corrupt imported model assets, version-mismatched intermediate assets, manually edited or merge-broken asset files. Also note this message's interpolation braces were left unescaped in the source (no $ prefix), so the entity name is printed literally.

Understand the failure class

Background: 'Could not be found', 'does not exist', 'not found in database': the resource-not-found family when an ID, slug, key, or URI lookup comes back empty — this error's family across 20 libraries.

Related errors

AI-assisted analysis of stride3d/stride@96fad776d2 (2026-09-14). Data as JSON: /api/errors/083ba7945d3a769a. Report an issue: GitHub.

Appendix: source

Thrown at sources/engine/Stride.Assets.Models/PrefabModelAssetCompiler.cs:185

                                .ToArray();

                            mesh.VertexData.AddRange(vertexes);

                            //indices
                            var indexBufferRef = AttachedReferenceManager.GetAttachedReference(modelMesh.Draw.IndexBuffer.Buffer);
                            byte[] indexData;
                            if (indexBufferRef.Data != null)
                            {
                                indexData = ((BufferData)indexBufferRef.Data).Content;
                            }
                            else if (!string.IsNullOrEmpty(indexBufferRef.Url))
                            {
                                var dataAsset = manager.Load<Buffer>(indexBufferRef.Url);
                                indexData = dataAsset.GetSerializationData().Content;
                            }
                            else
                            {
                                throw new Exception("Failed to get Indices BufferData for entity {chunk.Entity.Name}'s model.");
                            }

                            var indexSize = modelMesh.Draw.IndexBuffer.Is32Bit ? sizeof(uint) : sizeof(ushort);

                            byte[] indices;
                            if (isScalingNegative)
                            {
                                // Get reversed winding order
                                modelMesh.Draw.GetReversedWindingOrder(out indices);
                                indices = indices.Skip(modelMesh.Draw.IndexBuffer.Offset)
                                    .Take(modelMesh.Draw.IndexBuffer.Count*indexSize)
                                    .ToArray();
                            }
                            else
                            {
                                // Get indices normally
                                indices = indexData
                                    .Skip(modelMesh.Draw.IndexBuffer.Offset)

View on GitHub (pinned to 96fad776d2)