`react-doctor/r3f-require-instanced-buffer-update`

Instanced mesh buffer is not marked for upload

Category: Bugs
Severity: error
Source: oxlint-plugin-react-doctor
Framework: global
Enabled when: react, r3f
Tags: r3f, webgl
Default: Enabled

Validate the diagnostic

Confirm the reported code matches this rule before you edit it.

Confirm the reported code matches react-doctor/r3f-require-instanced-buffer-update. Compare it with the Before example and verify the same API, framework, and execution context. Treat it as a false positive only when one of those conditions differs.

Compare the code

The corrected pattern shows a focused way to address the diagnostic.

Reported pattern

mesh.current.setMatrixAt(index, matrix);

Corrected pattern

mesh.current.setMatrixAt(index, matrix);
mesh.current.instanceMatrix.needsUpdate = true;

How to fix

Use the corrected pattern as a reference. Preserve behavior that the rule does not require you to change.

Copyable fix prompt

Copy this self-contained prompt into your coding agent after you confirm the diagnostic.

Fix every confirmed react-doctor/r3f-require-instanced-buffer-update diagnostic in the current repository. Required change: - After setMatrixAt or setColorAt, set the matching instance buffer's needsUpdate flag to true.

Reference transformation:Before:

mesh.current.setMatrixAt(index, matrix);

After:

mesh.current.setMatrixAt(index, matrix);
mesh.current.instanceMatrix.needsUpdate = true;

Constraints: - Confirm the reported code matches the Before pattern. - Make the smallest change that fixes the root cause. - Preserve behavior and interfaces unrelated to this diagnostic. - Reuse existing project components, utilities, and conventions. - Do not introduce render-phase side effects, render-phase state updates, or Hooks rule violations. - Adapt identifiers and framework details instead of copying blindly. - Do not disable the rule or suppress matching code. - Confirm this rule is enabled for the project: react, r3f. Verification: - Run focused tests for the changed behavior. - Run React Doctor and confirm this diagnostic no longer appears. - Report the files changed and any checks you could not run.

More Bugs rules from the rules reference:

react-doctor/r3f-require-projection-matrix-update: Missing camera projection-matrix update
react-doctor/r3f-require-render-with-positive-priority: Positive useFrame priority without a render
react-doctor/r3f-require-root-unmount: R3F root without unmount cleanup
react-doctor/r3f-webgpu-canvas-prop-compatibility: Incompatible R3F Canvas renderer prop
react-doctor/r3f-webgpu-no-gl-state: WebGPU root reads deprecated gl state

react-doctor/r3f-require-instanced-buffer-update