`react-doctor/three-limit-shadowed-point-lights`

Too many shadow-casting Three.js point lights

Category: Performance
Severity: warn
Source: oxlint-plugin-react-doctor
Framework: global
Enabled when: three
Tags: three, webgl
Default: Enabled

Validate the diagnostic

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

Confirm the reported code matches react-doctor/three-limit-shadowed-point-lights. 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

for (let index = 0; index < 3; index += 1) {
  const light = new PointLight();
  light.castShadow = true;
  scene.add(light);
}

Corrected pattern

for (let index = 0; index < 3; index += 1) {
  const light = new PointLight();
  light.castShadow = index < 2;
  scene.add(light);
}

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/three-limit-shadowed-point-lights diagnostic in the current repository. Required change: - Keep at most two shadow-casting point lights in one scene, or use cheaper directional, spot, baked, or fake shadows.

Reference transformation:Before:

for (let index = 0; index < 3; index += 1) {
  const light = new PointLight();
  light.castShadow = true;
  scene.add(light);
}

After:

for (let index = 0; index < 3; index += 1) {
  const light = new PointLight();
  light.castShadow = index < 2;
  scene.add(light);
}

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. - Preserve resource ownership and cleanup. Do not move work into a hotter render or frame path. - 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: three. 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 Performance rules from the rules reference:

react-doctor/three-no-allocation-in-pointer-move: Three.js allocation inside pointer-move handler
react-doctor/three-no-clone-in-animation-loop: Three.js clone inside animation loop
react-doctor/three-no-material-recompile-in-animation-loop: Material recompiled inside animation loop
react-doctor/three-no-new-in-animation-loop: Allocation inside Three.js animation loop
react-doctor/three-no-object-construction-in-render: Three.js object constructed during React render

react-doctor/three-limit-shadowed-point-lights