flow like the river

VISUALIZACION/node_modules/three/examples/jsm/postprocessing/ClearPass.js

@@ -0,0 +1,46 @@
+import {
+	Color
+} from 'three';
+import { Pass } from './Pass.js';
+
+class ClearPass extends Pass {
+
+	constructor( clearColor, clearAlpha ) {
+
+		super();
+
+		this.needsSwap = false;
+
+		this.clearColor = ( clearColor !== undefined ) ? clearColor : 0x000000;
+		this.clearAlpha = ( clearAlpha !== undefined ) ? clearAlpha : 0;
+		this._oldClearColor = new Color();
+
+	}
+
+	render( renderer, writeBuffer, readBuffer /*, deltaTime, maskActive */ ) {
+
+		let oldClearAlpha;
+
+		if ( this.clearColor ) {
+
+			renderer.getClearColor( this._oldClearColor );
+			oldClearAlpha = renderer.getClearAlpha();
+
+			renderer.setClearColor( this.clearColor, this.clearAlpha );
+
+		}
+
+		renderer.setRenderTarget( this.renderToScreen ? null : readBuffer );
+		renderer.clear();
+
+		if ( this.clearColor ) {
+
+			renderer.setClearColor( this._oldClearColor, oldClearAlpha );
+
+		}
+
+	}
+
+}
+
+export { ClearPass };