{"record":{"id":"01ee416b5fcb6c59","repo":"FyroxEngine/Fyrox","slug":"vertex-size-must-match","errorCode":null,"errorMessage":"Vertex size must match!","messagePattern":"Vertex size must match!","errorType":"panic","errorClass":null,"httpStatus":null,"severity":"error","filePath":"fyrox-impl/src/scene/mesh/mod.rs","lineNumber":273,"sourceCode":"                ResourceKind::Embedded,\n                SurfaceData::new(\n                    src_data.vertex_buffer.clone_empty(4096),\n                    TriangleBuffer::new(Vec::with_capacity(4096)),\n                ),\n            ),\n            material: material.clone(),\n        });\n\n        let mut batch_data_guard = batch.data.data_ref();\n        let batch_data = &mut *batch_data_guard;\n        let start_vertex_index = batch_data.vertex_buffer.vertex_count();\n        let mut batch_vertex_buffer = batch_data.vertex_buffer.modify();\n        for src_vertex in src_data.vertex_buffer.iter() {\n            batch_vertex_buffer\n                .push_vertex_raw(&src_vertex.transform(&mut |vertex| {\n                    transform_vertex(vertex, &instance_data.world_transform)\n                }))\n                .expect(\"Vertex size must match!\");\n        }\n\n        let mut batch_geometry_buffer = batch_data.geometry_buffer.modify();\n        batch_geometry_buffer.push_triangles_with_offset(\n            start_vertex_index,\n            src_data.geometry_buffer.triangles_ref(),\n        );\n    }\n}\n\n/// Mesh is a 3D model, each mesh split into multiple surfaces, each surface represents a patch of the mesh with a single material\n/// assigned to each face. See [`Surface`] docs for more info.\n///\n/// ## How to create\n///\n/// Usually there is no need to manually create meshes, it is much easier to make one in a 3d modelling software or just download\n/// some model you like and load it in engine. See [`crate::resource::model::Model`] docs for more info about model resources.\n///","sourceCodeStart":255,"sourceCodeEnd":291,"githubUrl":"https://github.com/FyroxEngine/Fyrox/blob/76c91aad8eca488ce527b1af707be8b3b24ad72d/fyrox-impl/src/scene/mesh/mod.rs#L255-L291","documentation":"When batching meshes (Mesh::batch / push), source vertices are transformed and pushed into the batch's vertex buffer. push_vertex_raw requires each vertex's byte size to exactly match the batch buffer's declared layout. A mismatch means the source mesh's vertex format differs from the destination batch's, which the code treats as a hard error and panics.","triggerScenarios":"Merging meshes whose vertex buffers were created with different VertexFormat layouts (different attribute sets, ordering, or sizes); pushing vertices into a manually-created batch buffer with the wrong layout.","commonSituations":"Batching static meshes that were built with different custom vertex formats; a mesh saved by an older engine version with a legacy layout being merged into a new-format batch; procedural meshes forgetting to call set_vertex_format to match the target.","solutions":["Ensure all meshes being batched share an identical vertex layout (same attributes, order, and sizes)","Call vertex_buffer.set_vertex_format with the batch's layout descriptor on source meshes before merging, or re-create source buffers with the batch layout","Re-export/re-save legacy meshes with the current engine's default vertex format"],"exampleFix":"// before\nlet mut vb = VertexBuffer::new(vertex_count, vertices); // default layout\n\n// after\nlet mut vb = VertexBuffer::new(vertex_count, vertices)?;\nvb.set_vertex_format(&[VertexAttribute::new(...)])?; // match batch layout","handlingStrategy":"validation","validationCode":"if src_data.vertex_buffer.layout() != batch_vertex_buffer.layout() { /* abort merge with clear error */ }","typeGuard":"fn layouts_match(src: &VertexBuffer, dst: &VertexBuffer) -> bool { src.layout() == dst.layout() }","tryCatchPattern":"// compare vertex layouts before batching; panics indicate mismatched formats\nassert_eq!(src_data.vertex_buffer.layout(), batch_vertex_buffer.layout(), \"vertex layout mismatch\");","preventionTips":["Standardize one vertex format for all meshes destined for batching","Re-save legacy assets with the current engine version","Always call set_vertex_format on procedural buffers to match the target batch"],"tags":["panic","mesh","vertex-buffer","layout-mismatch"],"backgroundTag":"shape-mismatch","analyzedSha":"76c91aad8eca488ce527b1af707be8b3b24ad72d","analyzedAt":"2026-09-10T16:04:01.633Z","contentChangedAt":"2026-09-10T16:04:01.633Z","schemaVersion":2},"datasetVersion":"2026-09-16T09:17:16.951Z"}