PMREMGenerator: Don't pollute node material scope. (#30324)

Author: Mugen87

src/renderers/common/extras/PMREMGenerator.js

@@ -69,16 +69,18 @@ const _axisDirections = [
 	/*@__PURE__*/ new Vector3( 1, 1, 1 )
 ];
 
-//
+// maps blur materials to their uniforms dictionary
+
+const _uniformsMap = new WeakMap();
 
 // WebGPU Face indices
 const _faceLib = [
 	3, 1, 5,
 	0, 4, 2
 ];
 
-const direction = getDirection( uv(), attribute( 'faceIndex' ) ).normalize();
-const outputDirection = vec3( direction.x, direction.y, direction.z );
+const _direction = /*@__PURE__*/ getDirection( uv(), attribute( 'faceIndex' ) ).normalize();
+const _outputDirection = /*@__PURE__*/ vec3( _direction.x, _direction.y, _direction.z );
 
 /**
  * This class generates a Prefiltered, Mipmapped Radiance Environment Map
@@ -667,7 +669,7 @@ class PMREMGenerator {
 		const blurMesh = this._lodMeshes[ lodOut ];
 		blurMesh.material = blurMaterial;
 
-		const blurUniforms = blurMaterial.uniforms;
+		const blurUniforms = _uniformsMap.get( blurMaterial );
 
 		const pixels = this._sizeLods[ lodIn ] - 1;
 		const radiansPerPixel = isFinite( sigmaRadians ) ? Math.PI / ( 2 * pixels ) : 2 * Math.PI / ( 2 * MAX_SAMPLES - 1 );
@@ -871,7 +873,7 @@ function _getBlurShader( lodMax, width, height ) {
 		latitudinal,
 		weights,
 		poleAxis,
-		outputDirection,
+		outputDirection: _outputDirection,
 		dTheta,
 		samples,
 		envMap,
@@ -882,17 +884,18 @@ function _getBlurShader( lodMax, width, height ) {
 	};
 
 	const material = _getMaterial( 'blur' );
-	material.uniforms = materialUniforms; // TODO: Move to outside of the material
 	material.fragmentNode = blur( { ...materialUniforms, latitudinal: latitudinal.equal( 1 ) } );
 
+	_uniformsMap.set( material, materialUniforms );
+
 	return material;
 
 }
 
 function _getCubemapMaterial( envTexture ) {
 
 	const material = _getMaterial( 'cubemap' );
-	material.fragmentNode = cubeTexture( envTexture, outputDirection );
+	material.fragmentNode = cubeTexture( envTexture, _outputDirection );
 
 	return material;
 
@@ -901,7 +904,7 @@ function _getCubemapMaterial( envTexture ) {
 function _getEquirectMaterial( envTexture ) {
 
 	const material = _getMaterial( 'equirect' );
-	material.fragmentNode = texture( envTexture, equirectUV( outputDirection ), 0 );
+	material.fragmentNode = texture( envTexture, equirectUV( _outputDirection ), 0 );
 
 	return material;