July 2016
Intermediate to advanced
416 pages
6h 39m
Japanese
Content preview from 初めてのThree.js 第2版 ―WebGLのためのJavaScript 3DライブラリBecome an O’Reilly member and get unlimited access to this title plus top books and audiobooks from O’Reilly and nearly 200 top publishers, thousands of courses curated by job role, 150+ live events each month,
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12章物理演算と立体音響
この最終章では、Three.jsの基本的な機能を拡張できるライブラリPhysijsを紹介します。Physijsは3Dシーンに物理法則を導入するライブラリです。「3Dシーンに物理法則を導入する」とはつまりオブジェクトが重力の影響を受け、お互いに衝突し、衝撃を受けて移動し、ヒンジやスライダーなどで動きが制限されるようになるということです。このライブラリは内部的にはammo.jsという有名な物理エンジンを利用しています。本章では物理法則だけでなくシーンに立体音響を追加する方法についても説明します。
この章では次のようなトピックについて説明します。
- オブジェクトが重力の影響を受け、お互いに衝突するようになるPhysijsシーン
- シーン内の物体の摩擦係数と反発係数
- Physijsがサポートしているさまざまな形状
- 単純な形状を組み合わせた合成形状
- ハイトフィールドを使用した複雑な形状
- オブジェクトの動きの制限する点制約、ヒンジ制約、スライダー制約、コーンツイスト制約、自由度制約
- 左右の音量がカメラの位置に基づいて決定される音源
まず初めにPhysijsと組み合わせて使用するThree.jsシーンを作成します。本章の最初のサンプルをその説明に使用します。
12.1 基本的なThree.jsシーンの作成
Three.jsシーンをPhysijsのために設定するのは非常に簡単で、必要となるのはほんの数ステップです。初めにGitHubリポジトリ（http://chandlerprall.github.io/Physijs/）から適切なJavaScriptファイルを取得してHTMLページに読み込む必要があります。Physijsライブラリを次のようにHTMLページに追加してください。 ...
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O’Reilly covers everything we've got, with content to help us build a world-class technology community, upgrade the capabilities and competencies of our teams, and improve overall team performance as well as their engagement.Julian F.
I wanted to learn C and C++, but it didn't click for me until I picked up an O'Reilly book. When I went on the O’Reilly platform, I was astonished to find all the books there, plus live events and sandboxes so you could play around with the technology.Addison B.
I’ve been on the O’Reilly platform for more than eight years. I use a couple of learning platforms, but I'm on O'Reilly more than anybody else. When you're there, you start learning. I'm never disappointed.Amir M.
I'm always learning. So when I got on to O'Reilly, I was like a kid in a candy store. There are playlists. There are answers. There's on-demand training. It's worth its weight in gold, in terms of what it allows me to do.