Three.js森林瀑布

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var scene = new THREE.Scene();
var h = window.innerHeight,
    w = window.innerWidth;
var aspectRatio = w / h,
    fieldOfView = 25,
    nearPlane = .1,
    farPlane = 1000; 
var camera = new THREE.PerspectiveCamera(
    fieldOfView,
    aspectRatio,
    nearPlane,
    farPlane);
var renderer = new THREE.WebGLRenderer({canvas:canvas,alpha: true, antialias: true});
renderer.setSize( w, h );
renderer.shadowMapEnabled = true;
renderer.shadowMap.type = THREE.PCFSoftShadowMap;
document.body.appendChild( renderer.domElement );

camera.position.set(-5,6,8);
// camera.position.set(0,0,8); // front
// camera.position.set(-10,.2,0); //left
// camera.position.set(0,10,0); //top
// camera.position.y=4;

camera.lookAt(new THREE.Vector3(0,0,0));

//Ambient light
var light = new THREE.AmbientLight( 0xffffff ,.5);

var shadowLight = new THREE.DirectionalLight(0xffffff, .5);
shadowLight.position.set(200, 200, 200);
shadowLight.castShadow = true;

var backLight = new THREE.DirectionalLight(0xffffff, .2);
backLight.position.set(-100, 200, 50);
backLight.castShadow = true;
scene.add(backLight);
scene.add(light);
scene.add(shadowLight);

// grassland left
var geometry_left = new THREE.BoxGeometry( 2, .2, 2 );
var material_grass = new THREE.MeshLambertMaterial( { color: 0xABD66A } );
var ground_left = new THREE.Mesh( geometry_left, material_grass );
ground_left.position.set(-1,0.1,0);
scene.add( ground_left );
customizeShadow(ground_left,.25) // mess, opacity

//river
var geometry_river = new THREE.BoxGeometry( 1, .1, 2 );
var material_river = new THREE.MeshLambertMaterial( { color: 0x70B7E3 } );
var river = new THREE.Mesh( geometry_river, material_river );
river.position.set(.5,.1,0);
scene.add( river );
customizeShadow(river,.08) // mess, opacity
//river bed
var geometry_bed = new THREE.BoxGeometry( 1, .05, 2 );
var bed = new THREE.Mesh( geometry_bed , material_grass );
bed.position.set(.5,.025,0);
scene.add( bed );

//grassland right
var geometry_right = new THREE.BoxGeometry( 1, .2, 2 );
var ground_right = new THREE.Mesh( geometry_right, material_grass );
ground_right.position.set(1.5,0.1,0);
scene.add( ground_right );
customizeShadow(ground_right,.25) // mess, opacity

//left
tree(-1.75,-.85);
tree(-1.75,-.15);
tree(-1.5,-.5);
tree(-1.5,.4);
tree(-1.25,-.85);
tree(-1.25,.75);
tree(-.75,-.85);
tree(-.75,-.25);
tree(-.25,-.85);
//right
tree(1.25,-.85);
tree(1.25,.75);
tree(1.5,-.5);
tree(1.75,-.85);
tree(1.75,.35);

function customizeShadow(t,a){ //opacity, target mesh
  var material_shadow = new THREE.ShadowMaterial({opacity:a});
  var mesh_shadow = new THREE.Mesh( t.geometry, material_shadow );
  mesh_shadow.position.set(t.position.x,t.position.y,t.position.z);
  mesh_shadow.receiveShadow = true;
  scene.add( mesh_shadow );
}

var material_wood = new THREE.MeshLambertMaterial({ color: 0xA98F78  });

//bridge - wood block
for (var i=0;i<6;i++){
  var geometry_block = new THREE.BoxGeometry( .15, .02, .4 );
  var block = new THREE.Mesh( geometry_block, material_wood );
  block.position.set(0+.2*i,.21,.2);
  block.castShadow = true;
  block.receiveShadow = true;
  scene.add( block );
}
//bridge - rail
var geometry_rail_v = new THREE.BoxGeometry( .04,.3,.04 );
var rail_1 = new THREE.Mesh( geometry_rail_v, material_wood );
rail_1.position.set(-.1,.35,.4);
rail_1.castShadow = true;
customizeShadow(rail_1,.2);
scene.add( rail_1 );

var rail_2 = new THREE.Mesh( geometry_rail_v, material_wood );
rail_2.position.set(1.1,.35,.4);
rail_2.castShadow = true;
customizeShadow(rail_2,.2);
scene.add( rail_2 );

var rail_3 = new THREE.Mesh( geometry_rail_v, material_wood );
rail_3.position.set(-.1,.35,0);
rail_3.castShadow = true;
customizeShadow(rail_3,.2);
scene.add( rail_3 );

var rail_4 = new THREE.Mesh( geometry_rail_v, material_wood );
rail_4.position.set(1.1,.35,0);
rail_4.castShadow = true;
customizeShadow(rail_4,.2);
scene.add( rail_4 );

var geometry_rail_h = new THREE.BoxGeometry( 1.2,.04,.04 );
var rail_h1 = new THREE.Mesh( geometry_rail_h, material_wood );
rail_h1.position.set(0.5,.42,.4);
rail_h1.castShadow = true;
customizeShadow(rail_h1,.2);
scene.add( rail_h1 );

var rail_h2 = new THREE.Mesh( geometry_rail_h, material_wood );
rail_h2.position.set(0.5,.42,0);
rail_h2.castShadow = true;
customizeShadow(rail_h2,.2);
scene.add( rail_h2 );

var Drop=function(){
  this.geometry = new THREE.BoxGeometry(.1, .1, .1 );
  this.drop= new THREE.Mesh( this.geometry, material_river );
  this.drop.position.set(Math.random(.1,.9),0.1,1+(Math.random()-.5)*.1);
  scene.add( this.drop );
  this.speed=0;
  this.lifespan=(Math.random()*50)+50;
  
  this.update=function(){
    this.speed+=.0007;
    this.lifespan--;
    this.drop.position.x+=(.5-this.drop.position.x)/70;
    this.drop.position.y-=this.speed;
  }
}
var drops=[];

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