three.js/examples/js/cameras/CinematicCamera.js

( function () {

	class CinematicCamera extends THREE.PerspectiveCamera {

		constructor( fov, aspect, near, far ) {

			super( fov, aspect, near, far );
			this.type = 'CinematicCamera';
			this.postprocessing = {
				enabled: true
			};
			this.shaderSettings = {
				rings: 3,
				samples: 4
			};
			const depthShader = THREE.BokehDepthShader;
			this.materialDepth = new THREE.ShaderMaterial( {
				uniforms: depthShader.uniforms,
				vertexShader: depthShader.vertexShader,
				fragmentShader: depthShader.fragmentShader
			} );
			this.materialDepth.uniforms[ 'mNear' ].value = near;
			this.materialDepth.uniforms[ 'mFar' ].value = far;

			// In case of cinematicCamera, having a default lens set is important
			this.setLens();
			this.initPostProcessing();

		}

		// providing fnumber and coc(Circle of Confusion) as extra arguments
		// In case of cinematicCamera, having a default lens set is important
		// if fnumber and coc are not provided, cinematicCamera tries to act as a basic THREE.PerspectiveCamera
		setLens( focalLength = 35, filmGauge = 35, fNumber = 8, coc = 0.019 ) {

			this.filmGauge = filmGauge;
			this.setFocalLength( focalLength );
			this.fNumber = fNumber;
			this.coc = coc;

			// fNumber is focalLength by aperture
			this.aperture = focalLength / this.fNumber;

			// hyperFocal is required to calculate depthOfField when a lens tries to focus at a distance with given fNumber and focalLength
			this.hyperFocal = focalLength * focalLength / ( this.aperture * this.coc );

		}
		linearize( depth ) {

			const zfar = this.far;
			const znear = this.near;
			return - zfar * znear / ( depth * ( zfar - znear ) - zfar );

		}
		smoothstep( near, far, depth ) {

			const x = this.saturate( ( depth - near ) / ( far - near ) );
			return x * x * ( 3 - 2 * x );

		}
		saturate( x ) {

			return Math.max( 0, Math.min( 1, x ) );

		}

		// function for focusing at a distance from the camera
		focusAt( focusDistance = 20 ) {

			const focalLength = this.getFocalLength();

			// distance from the camera (normal to frustrum) to focus on
			this.focus = focusDistance;

			// the nearest point from the camera which is in focus (unused)
			this.nearPoint = this.hyperFocal * this.focus / ( this.hyperFocal + ( this.focus - focalLength ) );

			// the farthest point from the camera which is in focus (unused)
			this.farPoint = this.hyperFocal * this.focus / ( this.hyperFocal - ( this.focus - focalLength ) );

			// the gap or width of the space in which is everything is in focus (unused)
			this.depthOfField = this.farPoint - this.nearPoint;

			// Considering minimum distance of focus for a standard lens (unused)
			if ( this.depthOfField < 0 ) this.depthOfField = 0;
			this.sdistance = this.smoothstep( this.near, this.far, this.focus );
			this.ldistance = this.linearize( 1 - this.sdistance );
			this.postprocessing.bokeh_uniforms[ 'focalDepth' ].value = this.ldistance;

		}
		initPostProcessing() {

			if ( this.postprocessing.enabled ) {

				this.postprocessing.scene = new THREE.Scene();
				this.postprocessing.camera = new THREE.OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, - 10000, 10000 );
				this.postprocessing.scene.add( this.postprocessing.camera );
				this.postprocessing.rtTextureDepth = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight );
				this.postprocessing.rtTextureColor = new THREE.WebGLRenderTarget( window.innerWidth, window.innerHeight );
				const bokeh_shader = THREE.BokehShader;
				this.postprocessing.bokeh_uniforms = THREE.UniformsUtils.clone( bokeh_shader.uniforms );
				this.postprocessing.bokeh_uniforms[ 'tColor' ].value = this.postprocessing.rtTextureColor.texture;
				this.postprocessing.bokeh_uniforms[ 'tDepth' ].value = this.postprocessing.rtTextureDepth.texture;
				this.postprocessing.bokeh_uniforms[ 'manualdof' ].value = 0;
				this.postprocessing.bokeh_uniforms[ 'shaderFocus' ].value = 0;
				this.postprocessing.bokeh_uniforms[ 'fstop' ].value = 2.8;
				this.postprocessing.bokeh_uniforms[ 'showFocus' ].value = 1;
				this.postprocessing.bokeh_uniforms[ 'focalDepth' ].value = 0.1;

				//console.log( this.postprocessing.bokeh_uniforms[ "focalDepth" ].value );

				this.postprocessing.bokeh_uniforms[ 'znear' ].value = this.near;
				this.postprocessing.bokeh_uniforms[ 'zfar' ].value = this.near;
				this.postprocessing.bokeh_uniforms[ 'textureWidth' ].value = window.innerWidth;
				this.postprocessing.bokeh_uniforms[ 'textureHeight' ].value = window.innerHeight;
				this.postprocessing.materialBokeh = new THREE.ShaderMaterial( {
					uniforms: this.postprocessing.bokeh_uniforms,
					vertexShader: bokeh_shader.vertexShader,
					fragmentShader: bokeh_shader.fragmentShader,
					defines: {
						RINGS: this.shaderSettings.rings,
						SAMPLES: this.shaderSettings.samples,
						DEPTH_PACKING: 1
					}
				} );
				this.postprocessing.quad = new THREE.Mesh( new THREE.PlaneGeometry( window.innerWidth, window.innerHeight ), this.postprocessing.materialBokeh );
				this.postprocessing.quad.position.z = - 500;
				this.postprocessing.scene.add( this.postprocessing.quad );

			}

		}
		renderCinematic( scene, renderer ) {

			if ( this.postprocessing.enabled ) {

				const currentRenderTarget = renderer.getRenderTarget();
				renderer.clear();

				// Render scene into texture

				scene.overrideMaterial = null;
				renderer.setRenderTarget( this.postprocessing.rtTextureColor );
				renderer.clear();
				renderer.render( scene, this );

				// Render depth into texture

				scene.overrideMaterial = this.materialDepth;
				renderer.setRenderTarget( this.postprocessing.rtTextureDepth );
				renderer.clear();
				renderer.render( scene, this );

				// Render bokeh composite

				renderer.setRenderTarget( null );
				renderer.render( this.postprocessing.scene, this.postprocessing.camera );
				renderer.setRenderTarget( currentRenderTarget );

			}

		}

	}

	THREE.CinematicCamera = CinematicCamera;

} )();