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raycasterでクリックイベントの実現

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デモ:http://mo49.tokyo/threejs/raycaster2.html

つくったmeshをrayReceiveObjectsに集める。

javascript
var rayReceiveObjects = []; // 光線を受けるオブジェクト配列

for (var i = 0; i < 20; i++) {
	rayReceiveObjects.push( meshs[i] );
}

光線と交わるオブジェクトとしてrayReceiveObjectsを登録し、
mousedownイベントの中でraycasterを実行。

javascript
var raycaster = new THREE.Raycaster(); 
var mouse = new THREE.Vector2();

window.addEventListener( 'mousedown', onDocumentMouseDown, false );
function onDocumentMouseDown( event ) {

	// イベントの伝播の無効化
	event.preventDefault();

	// マウスポインタの位置座標の取得
	mouse.x = ( event.clientX / window.innerWidth ) * 2 - 1; 
	mouse.y = - ( event.clientY / window.innerHeight ) * 2 + 1;	

	// 光線を発射
	raycaster.setFromCamera( mouse, camera );
	// 光線と交わるオブジェクトを収集
	var intersects = raycaster.intersectObjects( rayReceiveObjects );

	// 連想配列をとりだす
	var bookAry = {
		'火花' : 'http://www.amazon.co.jp/dp/4163902309',
		'' : 'http://www.amazon.co.jp/dp/4062194856',
		'朝が来る' : 'http://www.amazon.co.jp/dp/4163902732',
		'王とサーカス' : 'http://www.amazon.co.jp/dp/4488027512',
		'君の膵臓をたべたい' : 'http://www.amazon.co.jp/dp/4575239054'
	};
	
	// 交わるオブジェクトが1個以上の場合
	if ( intersects.length > 0 ) {
		// 最も近いオブジェクトの名前をアラート表示する
		alert(intersects[0].object.name + "をご購入ですね?");
		console.log("カメラ位置座標からの距離:" + intersects[0].distance);
		console.log("光線との交差座標(" + intersects[0].point.x + ", " + intersects[0].point.y + ", " + intersects[0].point.z + ")" );
		console.log(intersects[0]);

		for(var i in bookAry){
			if (intersects[0].object.name == i) {
				window.location.href = bookAry[i];
			}
		}
	}
}

参考
three.jsによるHTML5 3Dグラフィックス〈上〉―ブラウザで実現するOpenGL(WebGL)の世界

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