PMREMGenerator: Fix usage with `PMREMNode`. (#31001)

src/renderers/common/extras/PMREMGenerator.js

@@ -161,7 +161,7 @@ class PMREMGenerator {
 
 			console.warn( 'THREE.PMREMGenerator: .fromScene() called before the backend is initialized. Try using .fromSceneAsync() instead.' );
 
-			const cubeUVRenderTarget = renderTarget || this._allocateTargets();
+			const cubeUVRenderTarget = renderTarget || this._allocateTarget();
 
 			options.renderTarget = cubeUVRenderTarget;
 
@@ -175,9 +175,11 @@ class PMREMGenerator {
 		_oldActiveCubeFace = this._renderer.getActiveCubeFace();
 		_oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();
 
-		const cubeUVRenderTarget = renderTarget || this._allocateTargets();
+		const cubeUVRenderTarget = renderTarget || this._allocateTarget();
 		cubeUVRenderTarget.depthBuffer = true;
 
+		this._init( cubeUVRenderTarget );
+
 		this._sceneToCubeUV( scene, near, far, cubeUVRenderTarget, position );
 
 		if ( sigma > 0 ) {
@@ -238,7 +240,7 @@ class PMREMGenerator {
 
 			this._setSizeFromTexture( equirectangular );
 
-			const cubeUVRenderTarget = renderTarget || this._allocateTargets();
+			const cubeUVRenderTarget = renderTarget || this._allocateTarget();
 
 			this.fromEquirectangularAsync( equirectangular, cubeUVRenderTarget );
 
@@ -286,7 +288,7 @@ class PMREMGenerator {
 
 			this._setSizeFromTexture( cubemap );
 
-			const cubeUVRenderTarget = renderTarget || this._allocateTargets();
+			const cubeUVRenderTarget = renderTarget || this._allocateTarget();
 
 			this.fromCubemapAsync( cubemap, renderTarget );
 
@@ -423,7 +425,8 @@ class PMREMGenerator {
 		_oldActiveCubeFace = this._renderer.getActiveCubeFace();
 		_oldActiveMipmapLevel = this._renderer.getActiveMipmapLevel();
 
-		const cubeUVRenderTarget = renderTarget || this._allocateTargets();
+		const cubeUVRenderTarget = renderTarget || this._allocateTarget();
+		this._init( cubeUVRenderTarget );
 		this._textureToCubeUV( texture, cubeUVRenderTarget );
 		this._applyPMREM( cubeUVRenderTarget );
 		this._cleanup( cubeUVRenderTarget );
@@ -432,24 +435,20 @@ class PMREMGenerator {
 
 	}
 
-	_allocateTargets() {
+	_allocateTarget() {
 
 		const width = 3 * Math.max( this._cubeSize, 16 * 7 );
 		const height = 4 * this._cubeSize;
 
-		const params = {
-			magFilter: LinearFilter,
-			minFilter: LinearFilter,
-			generateMipmaps: false,
-			type: HalfFloatType,
-			format: RGBAFormat,
-			colorSpace: LinearSRGBColorSpace,
-			//depthBuffer: false
-		};
+		const cubeUVRenderTarget = _createRenderTarget( width, height );
+
+		return cubeUVRenderTarget;
+
+	}
 
-		const cubeUVRenderTarget = _createRenderTarget( width, height, params );
+	_init( renderTarget ) {
 
-		if ( this._pingPongRenderTarget === null || this._pingPongRenderTarget.width !== width || this._pingPongRenderTarget.height !== height ) {
+		if ( this._pingPongRenderTarget === null || this._pingPongRenderTarget.width !== renderTarget.width || this._pingPongRenderTarget.height !== renderTarget.height ) {
 
 			if ( this._pingPongRenderTarget !== null ) {
 
@@ -457,17 +456,15 @@ class PMREMGenerator {
 
 			}
 
-			this._pingPongRenderTarget = _createRenderTarget( width, height, params );
+			this._pingPongRenderTarget = _createRenderTarget( renderTarget.width, renderTarget.height );
 
 			const { _lodMax } = this;
 			( { sizeLods: this._sizeLods, lodPlanes: this._lodPlanes, sigmas: this._sigmas, lodMeshes: this._lodMeshes } = _createPlanes( _lodMax ) );
 
-			this._blurMaterial = _getBlurShader( _lodMax, width, height );
+			this._blurMaterial = _getBlurShader( _lodMax, renderTarget.width, renderTarget.height );
 
 		}
 
-		return cubeUVRenderTarget;
-
 	}
 
 	async _compileMaterial( material ) {
@@ -849,7 +846,17 @@ function _createPlanes( lodMax ) {
 
 }
 
-function _createRenderTarget( width, height, params ) {
+function _createRenderTarget( width, height ) {
+
+	const params = {
+		magFilter: LinearFilter,
+		minFilter: LinearFilter,
+		generateMipmaps: false,
+		type: HalfFloatType,
+		format: RGBAFormat,
+		colorSpace: LinearSRGBColorSpace,
+		//depthBuffer: false
+	};
 
 	const cubeUVRenderTarget = new RenderTarget( width, height, params );
 	cubeUVRenderTarget.texture.mapping = CubeUVReflectionMapping;