CG/sample1.html at master · NamikoToriyama/CG · GitHub

1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
25
26
27
28
29
30
31
32
33
34
35
36
37
38
39
40
41
42
43
44
45
46
47
48
49
50
51
52
53
54
55
56
57
58
59
60
61
62
63
64
65
66
67
68
69
70
71
72
73
74
75
76
77
78
79
80
81
82
83
84
85
86
87
88
89
90
91
92
93
94
95
96
97
98
99
100
101
102
103
104
105
106
107
108
109
110
111
112
113
114
115
116
117
118
119
120
121
122
123
124
125
126
127
128
129
130
131
132
133
134
135
136
137
138
139
140
141
142
143
144
145
146
147
148
149
150
151
152
153
154
155
156
157
158
159
160
161
162
163
164
165
166
167
168
169
170
171
172
173
174
175
176
177
178
179
180
181
182
183
184
185
186
187
188
189
190
191
192
193
194
195
196
197
198
199
200
201
202
203
204
205
206
207
208
209
210
211
212
213
214
215
216
217
218
219
220
221
222
223
224
225
226
227
228
229
230
231
232
233
234
235
236
237
238
239
240
241
242
243
244
<!DOCTYPE html>
<html>
<head>
<meta charset="UTF-8">
<title>Sample Test</title>
<link rel="stylesheet" href="https://stackpath.bootstrapcdn.com/bootstrap/4.3.1/css/bootstrap.min.css" integrity="sha384-ggOyR0iXCbMQv3Xipma34MD+dH/1fQ784/j6cY/iJTQUOhcWr7x9JvoRxT2MZw1T" crossorigin="anonymous">
<script src="http://www.natural-science.or.jp/javascript/three_r56.js"></script>
<script src="http://www.natural-science.or.jp/javascript/raf.js"></script>
<link rel="stylesheet" href="css/sample.css">

<style type="text/css">
div#canvas-frame{
  border: none;
  cursor: pointer;
  width: 900px;
  height: 900px;
  background-color: #EEEEEE;
}
</style>
<script>
  var g = 9.8;   //重力加速度
	var t = 0;     //時刻
	var dt = 0.001; //時間刻み
  var skip = 500; //計算回数
  var Sphere = function(x,y,z,vx,vy,vz){
		this.x = x;   this.y  = y;   this.z = z;
		this.vx = vx;   this.vy  = vy;   this.vz = vz;
	};
  var sphere = new Sphere(0, 0, 300, 0, 0, 0);

  var renderer;
  function initThree() {
    width = window.innerWidth;
    height = window.innerHeight - document.getElementById("navbar").clientHeight;
    renderer = new THREE.WebGLRenderer({antialias: true}); // ThreeJSのrenderを呼び出し
    renderer.setSize(width, height); // renderのサイズを設定する
    document.getElementById('canvas-frame').appendChild(renderer.domElement);
    renderer.setClearColorHex(0xFFFFFF, 1.0); // 背景の色を設定
    renderer.shadowMapEnabled = true; // renderが影をつけれるようにする
  }

  // カメラの位置
  var camera;
  function initCamera() {
    camera = new THREE.PerspectiveCamera( 45 , width / height , 1 , 10000 );// 透視投影的な
    camera.position.x = 1000;
    camera.position.y = 100;
    camera.position.z = 50;
    camera.up.x = 0;
    camera.up.y = 0;
    camera.up.z = 1;
    camera.lookAt( {x:0, y:0, z:0 } );
  }
  var scene;
  function initScene() {
    scene = new THREE.Scene();
  }
  var light;
  function initLight() {
    light = new THREE.DirectionalLight(0xFFFFFF, 1.0, 0);// 光の色
    light.position.set( 0, 0, 500 ); // 光源の座標、 z軸をまっすぐにするとまっすぐに影ができる
    light.castShadow = true;
    scene.add(light);
  }

  function initObject(){
    sphere.object = new THREE.Mesh(
         new THREE.SphereGeometry(50,50,50),                //形状の設定
         new THREE.MeshLambertMaterial({color: 0xff00ff}) //材質の設定
    );
    scene.add(sphere.object);
    sphere.object.position.set(0,0,400);
    sphere.object.castShadow = true;

    //床の描画
		var yuka_n = 10, yuka_w = 50;//床の個数とサイズ
		for(var i=-yuka_n; i<=yuka_n ; i++){
			for(var j=-yuka_n; j<=yuka_n ; j++){
				if((i+j)%2==0) var plane = new THREE.Mesh(
							new THREE.PlaneGeometry(yuka_w, yuka_w, 5, 5),
							new THREE.MeshLambertMaterial({color: 0x999999, ambient:0x050505}));
				else var plane = new THREE.Mesh(
							new THREE.PlaneGeometry(yuka_w, yuka_w, 5, 5),
							new THREE.MeshLambertMaterial({color: 0x4d4d4d, ambient:0x050505}));
				plane.position.x = j*yuka_w;
				plane.position.y = i*yuka_w;
				plane.receiveShadow = true;
				scene.add(plane);
			}
    }
  }
  // 回転をするように設定する
  var t=0;
  function loop() {
    for(var i=1; i<=skip; i++) sphere.RungeKutta();
    t += dt * skip;
		sphere.object.position.set(sphere.x, sphere.y, sphere.z);
		camera.lookAt( {x:0, y:0, z:100 } ); // これで回る
		renderer.clear();
		renderer.render(scene, camera);
		window.requestAnimationFrame(loop);
  }

  var down = false;
  var sy = 0, sz = 0;
  window.onmousedown = function (ev){    //マウスダウン
    if (ev.target == renderer.domElement) {
      down = true;
      sy = ev.clientX; sz = ev.clientY;
    }
  };
  window.onmouseup = function(){        //マウスアップ
    down = false;
  };
  window.onmousemove = function(ev) {   //マウスムーブ
    var speed = 2;
    if (down) {
        if (ev.target == renderer.domElement) {
        var dy = -(ev.clientX - sy);
        var dz = -(ev.clientY - sz);
        camera.position.y += dy*speed;
        camera.position.z -= dz*speed;
        sy -= dy;
        sz -= dz;
      }
    }
  }
  window.onmousewheel = function(ev){   //マウスホイール
    var speed = 0.2;
    camera.position.x += ev.wheelDelta * speed ;
  }

  function threeStart() {
    initThree();
    initCamera();
    initScene();
    initLight();
    initObject();
    loop();
  }

	//////////////////////////////////////////////////////////////////////////////////
	// ボールが落下するコード
	//////////////////////////////////////////////////////////////////////////////////
  Sphere.prototype.fx = function(t, x, y, z, vx, vy, vz){
    return vx;
  }
  Sphere.prototype.fvx = function(t, x, y, z, vx, vy, vz){
  var l2 = Math.pow(x,2)  + Math.pow(y,2)  + Math.pow(z,2);
  var v2 = Math.pow(vx,2) + Math.pow(vy,2) + Math.pow(vz,2);
  return (g*z-v2) * x / l2 ;
	}
	Sphere.prototype.fy = function(t, x, y, z, vx, vy, vz){
	  return vy;
	}
	Sphere.prototype.fvy = function(t, x, y, z, vx, vy, vz){
		var l2 = Math.pow(x,2)  + Math.pow(y,2)  + Math.pow(z,2);
		var v2 = Math.pow(vx,2) + Math.pow(vy,2) + Math.pow(vz,2);
		return (g*z-v2) * y / l2 ;
	}
	Sphere.prototype.fz = function(t, x, y, z, vx, vy, vz){
	  return vz;
	}
	Sphere.prototype.fvz = function(t, x, y, z, vx, vy, vz){
		var l2 = Math.pow(x,2)  + Math.pow(y,2)  + Math.pow(z,2);
		var v2 = Math.pow(vx,2) + Math.pow(vy,2) + Math.pow(vz,2);
		return -g + (g*z-v2) * z / l2 ;
	}
	Sphere.prototype.RungeKutta = function(){
	  var k1 = new Array(6);
	  var k2 = new Array(6);
	  var k3 = new Array(6);
	  var k4 = new Array(6);

    // x, y, z のとりかたで様々な動きが取れそう
    // これをいじると動くっぽい
	  var x = this.x - 1;
	  var y = this.y - 1;
    var z = this.z;

    // vx = +1
    // vy = -1
    // vz = -a で螺旋に収束する
	  var vx = this.vx + 1;
	  var vy = this.vy - 1;
	  var vz = this.vz - 1;
	  k1[0]=dt*this.fx(t,x,y,z,vx,vy,vz);
	  k1[1]=dt*this.fvx(t,x,y,z,vx,vy,vz);
	  k1[2]=dt*this.fy(t,x,y,z,vx,vy,vz);
	  k1[3]=dt*this.fvy(t,x,y,z,vx,vy,vz);
	  k1[4]=dt*this.fz(t,x,y,z,vx,vy,vz);
	  k1[5]=dt*this.fvz(t,x,y,z,vx,vy,vz);
	  k2[0]=dt*this.fx(t+dt/2.0, x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k2[1]=dt*this.fvx(t+dt/2.0,x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k2[2]=dt*this.fy(t+dt/2.0, x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k2[3]=dt*this.fvy(t+dt/2.0,x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k2[4]=dt*this.fz(t+dt/2.0, x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k2[5]=dt*this.fvz(t+dt/2.0,x+k1[0]/2.0,y+k1[2]/2.0,z+k1[4]/2.0,vx+k1[1]/2.0,vy+k1[3]/2.0,vz+k1[5]/2.0);
	  k3[0]=dt*this.fx(t+dt/2.0, x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k3[1]=dt*this.fvx(t+dt/2.0,x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k3[2]=dt*this.fy(t+dt/2.0, x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k3[3]=dt*this.fvy(t+dt/2.0,x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k3[4]=dt*this.fz(t+dt/2.0, x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k3[5]=dt*this.fvz(t+dt/2.0,x+k2[0]/2.0,y+k2[2]/2.0,z+k2[4]/2.0,vx+k2[1]/2.0,vy+k2[3]/2.0,vz+k2[5]/2.0);
	  k4[0]=dt*this.fx(t+dt/2.0, x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  k4[1]=dt*this.fvx(t+dt/2.0,x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  k4[2]=dt*this.fy(t+dt/2.0, x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  k4[3]=dt*this.fvy(t+dt/2.0,x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  k4[4]=dt*this.fz(t+dt/2.0, x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  k4[5]=dt*this.fvz(t+dt/2.0,x+k3[0],y+k3[2],z+k3[4],vx+k3[1],vy+k3[3],vz+k3[5]);
	  this.x  +=  (k1[0]+2.0*k2[0]+2.0*k3[0]+k4[0])/6.0;
	  this.vx +=  (k1[1]+2.0*k2[1]+2.0*k3[1]+k4[1])/6.0;
	  this.y  +=  (k1[2]+2.0*k2[2]+2.0*k3[2]+k4[2])/6.0;
	  this.vy +=  (k1[3]+2.0*k2[3]+2.0*k3[3]+k4[3])/6.0;
	  this.z  +=  (k1[4]+2.0*k2[4]+2.0*k3[4]+k4[4])/6.0;
	  this.vz +=  (k1[5]+2.0*k2[5]+2.0*k3[5]+k4[5])/6.0;
	}
	//ルンゲクッタ終わり
	///////////////////////////////////////////////////////////////////////
</script>
</head>

<body onload="threeStart();">
  <nav class="navbar navbar-expand-lg navbar-light bg-transparent" id = "navbar">
    <div class="collapse navbar-collapse" id="navbarSupportedContent">
      <ul class="navbar-nav mr-auto">
        <li class="nav-item active">
          <a class="nav-link" href="index.html">Home</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="sample5.html">作品1</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="sample6.html">作品2</a>
        </li>
        <li class="nav-item">
          <a class="nav-link" href="sample7.html">作品3</a>
        </li>
      </ul>
    </div>
  </nav>
<div id="canvas-frame"></div>
</body>
</html>