`react-doctor/three-shader-no-inverse-of-uniform`

Shader inverts a uniform matrix per invocation

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-shader-no-inverse-of-uniform. 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

const material = new ShaderMaterial({
  vertexShader: `
uniform mat4 objectTransform;
vec4 local = inverse(objectTransform) * worldPosition;
`,
  uniforms: { objectTransform: { value: transform } },
});

Corrected pattern

const inverseTransform = new Matrix4()
  .copy(transform)
  .invert();
const material = new ShaderMaterial({
  vertexShader: `
uniform mat4 inverseTransform;
vec4 local = inverseTransform * worldPosition;
`,
  uniforms: { inverseTransform: { value: inverseTransform } },
});

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-shader-no-inverse-of-uniform diagnostic in the current repository. Required change: - Compute uniform matrix inverses once on the CPU and upload the result.

Reference transformation:Before:

const material = new ShaderMaterial({
  vertexShader: `
uniform mat4 objectTransform;
vec4 local = inverse(objectTransform) * worldPosition;
`,
  uniforms: { objectTransform: { value: transform } },
});

After:

const inverseTransform = new Matrix4()
  .copy(transform)
  .invert();
const material = new ShaderMaterial({
  vertexShader: `
uniform mat4 inverseTransform;
vec4 local = inverseTransform * worldPosition;
`,
  uniforms: { inverseTransform: { value: inverseTransform } },
});

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-shader-no-redundant-frag-depth: Shader redundantly writes fragment depth
react-doctor/three-shader-prefer-small-integer-pow: Shader uses pow for a small integer exponent
react-doctor/three-shader-prefer-squared-distance-comparison: Shader compares a computed distance
react-doctor/use-lazy-motion: Use `import { LazyMotion, m } from "framer-motion"` with `domAnimation` features — saves ~30kb
react-doctor/webgl-no-sync-readback-in-animation-loop: Synchronous GPU readback inside animation loop

react-doctor/three-shader-no-inverse-of-uniform