Fixing Environment Map Artifacts in Three.js

The white pixel artifacts you're experiencing along the edges of objects when using environment maps is a common issue in Three.js. Based on the information available, here are some potential solutions:

Use PMREMGenerator for Environment Maps

The most likely cause of your artifacts is that you're using an environment map that hasn't been properly preprocessed. Three.js documentation specifically recommends using the PMREMGenerator to preprocess environment maps for physically accurate rendering:

JAVASCRIPTCopied
// Proper way to apply an environment map
function applyEnvironmentMap(scene, renderer) {
  // Load your environment map
  const textureLoader = new THREE.TextureLoader();
  const envMap = textureLoader.load('path/to/environment.jpg');
  
  // Create a PMREMGenerator and process the environment map
  const pmremGenerator = new THREE.PMREMGenerator(renderer);
  pmremGenerator.compileEquirectangularShader();
  
  const envMapProcessed = pmremGenerator.fromEquirectangular(envMap).texture;
  
  // Apply to your material
  const material = new THREE.MeshStandardMaterial({
    // other properties...
    envMap: envMapProcessed,
    envMapIntensity: 1.0 // Adjust as needed
  });
  
  // Clean up
  envMap.dispose();
  pmremGenerator.dispose();
  
  return material;
}

Adjust Environment Map Intensity

If the artifacts persist, try adjusting the envMapIntensity property to reduce the effect of the environment map:

JAVASCRIPTCopied
material.envMapIntensity = 0.5; // Try a lower value

Check Texture Settings

Make sure your environment map texture has appropriate settings:

JAVASCRIPTCopied
envMap.mapping = THREE.EquirectangularReflectionMapping;
envMap.encoding = THREE.sRGBEncoding; // or THREE.LinearEncoding depending on your needs

Ensure Proper Material Configuration

If you're using MeshStandardMaterial, make sure other material properties are properly set:

JAVASCRIPTCopied
material.roughness = 0.5; // Adjust as needed
material.metalness = 0.5; // Adjust as needed

Extreme values of roughness or metalness can sometimes exacerbate environment map artifacts.

By implementing these suggestions, particularly using the PMREMGenerator to preprocess your environment maps, you should be able to eliminate the white pixel artifacts along the edges of your objects.