Three系列1_CinematicCamera外掛介紹

隨遇丿而安發表於2020-10-08

Camera外掛之CinematicCamera

繼承自PerspectiveCame

建構函式引用的PerspectiveCamera的建構函式, 程式碼如下

var CinematicCamera = function ( fov, aspect, near, far ) {
    
	PerspectiveCamera.call( this, fov, aspect, near, far );
    ...
}

那麼說到底, CinematicCamera還是PerspectiveCamera!!!

效果演示

有沒有發現其中的奧祕呢?

這種相機可以設定焦點哦, 突出想要關注的地方, 其他地方比較模糊

1. 屬性介紹

屬性名: 型別 功能 預設值
type : 字串 描述資訊 'CinematicCamera'
postprocessing : 物件 對相機的全部設定 { enabled: true }
shaderSettings : 物件 渲染設定, 最後應用在postprocessing { rings: 3, samples: 4 }
depthShader : 未知 組成ShaderMaterial給materialDepth BokehDepthShader
materialDepth : ShaderMaterial 賦予了scene.overrideMaterial materialDepth

materialDepth

this.materialDepth = new ShaderMaterial( {
 uniforms: depthShader.uniforms,
 vertexShader: depthShader.vertexShader,
 fragmentShader: depthShader.fragmentShader
} )
this.materialDepth.uniforms[ 'mNear' ].value = near;
this.materialDepth.uniforms[ 'mFar' ].value = far;

scene.overrideMaterial = this.materialDepth;

2. 方法介紹

方法名: 返回型別 功能 具體內容
類方法 : setLens( focalLength, filmGauge, fNumber, coc ) setLens
類方法 : linearize( depth ) linearize
類方法 : smoothstep( near, far, depth ) smoothstep
類方法 : saturate( x ) saturate
類方法 : focusAt( focusDistance ) focusAt
類方法 : initPostProcessing() initPostProcessing
類方法 : renderCinematic( scene, renderer ) renderCinematic

3. 方法詳情

setLens

function ( focalLength, filmGauge, fNumber, coc ) {

 // In case of cinematicCamera, having a default lens set is important
 if ( focalLength === undefined ) focalLength = 35;
 if ( filmGauge !== undefined ) this.filmGauge = filmGauge;

 this.setFocalLength( focalLength );

 // if fnumber and coc are not provided, cinematicCamera tries to act as a basic PerspectiveCamera
 if ( fNumber === undefined ) fNumber = 8;
 if ( coc === undefined ) coc = 0.019;

 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

function ( depth ) {

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

};

smoothstep

function ( near, far, depth ) {

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

};

saturate

function ( x ) {

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

}

focusAt

function ( focusDistance ) {

 if ( focusDistance === undefined ) focusDistance = 20;

 var 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

function () {

 if ( this.postprocessing.enabled ) {

  this.postprocessing.scene = new Scene();

  this.postprocessing.camera = new OrthographicCamera( window.innerWidth / - 2, window.innerWidth / 2, window.innerHeight / 2, window.innerHeight / - 2, - 10000, 10000 );

  this.postprocessing.scene.add( this.postprocessing.camera );

  var pars = { minFilter: LinearFilter, magFilter: LinearFilter, format: RGBFormat };
  this.postprocessing.rtTextureDepth = new WebGLRenderTarget( window.innerWidth, window.innerHeight, pars );
  this.postprocessing.rtTextureColor = new WebGLRenderTarget( window.innerWidth, window.innerHeight, pars );

  var bokeh_shader = BokehShader;

  this.postprocessing.bokeh_uniforms = 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 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 Mesh( new PlaneBufferGeometry( window.innerWidth, window.innerHeight ), this.postprocessing.materialBokeh );
  this.postprocessing.quad.position.z = - 500;
  this.postprocessing.scene.add( this.postprocessing.quad );

 }

};

renderCinematic

function ( scene, renderer ) {

 if ( this.postprocessing.enabled ) {

  var 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 );

 }

};

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