A three.js material lit by scene.environment ignores its own envMapIntensity

Fact

When a Standard, Physical, Lambert or Phong material has no envMap of its own and the scene has scene.environment, the renderer overwrites that material's envMapIntensity uniform with scene.environmentIntensity on every draw (three r163 and later). The material's own envMapIntensity is never read.

Why it matters

Per-material reflection strength silently stops working: glossy eyes and satin fur reflect the same amount, and tuning the number on the material changes nothing, which reads as a broken environment map or a wrong roughness. scene.environment also reaches Lambert and Phong materials as a reflection, changing materials that were never meant to be part of it.

How to apply

• To keep per-material strengths, assign the texture to each material's own envMap (keep a registry of the materials you make) and leave scene.environment unset.
• To dim them all together (night), use one shared uniform injected in onBeforeCompile, e.g. replace * envMapIntensity with * envMapIntensity * uShared in envmap_physical_pars_fragment.
• One global strength for everything is the only case scene.environment with scene.environmentIntensity handles as written.