October 2024
Intermediate
240 pages
6h 57m
Japanese
Content preview from 図解まるわかり VR・AR・MRのしくみ
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194
CesiumJS
地球上の地理データを扱う
8-6
世界の地理データを3D化できる
Googleマップのストリートビューのように、XR開発においても地理情
報を3D空間上に再現することがあります。こうしたXRコンテンツ開発に
おける地理情報の活用を支援する技術が、
CesiumJSです。
CesiumJSは、WebGL（ブラウザ上で 3D グラフィックスを高速に描画す
る技術）ベースのオープンソースJavaScriptライブラリです。地球の3D
地理情報を取得して、仮想空間にリアルタイムでマッピングするための幅
広い機能を提供しています。
クロスプラットフォーム対応（異なるOS環境で同じ仕様のアプリケー
ションを動作させるプログラム）で高性能なグラフィックを表現でき、
3Dの地図や地球の表示、衛星画像の重ね合わせ、3Dモデルの建物の配置
などが可能です（図8-11）。オープンソースで提供されているため、誰で
も使用することができます。
CesiumJSによる地形情報の3D化
CesiumJSは、衛星画像や航空写真、地形データ、3D都市モデルなどを
組み合わせて、実際の地球を見ているかのような3D地球儀など、リアル
な3D グラフィックスを表示する機能を備えています（図 8-12）。
地形データに関しては、CesiumJS は DEM（デジタル標高モデル）を使
用します。DEM は、地表面の高さを格子状に記録したデータで、起伏の
ある地形を正確に表現できます。CesiumJSは、読み込んだDEMデータを
メッシュとして扱い、ブラウザ上で ...
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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.