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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134
ミップマップ
遠近感によるテクスチャを表現
6-5
遠近感にはテクスチャ表現が不可欠
遠近感は3D空間の奥行きを演出し、ユーザーが物体の距離や位置を把
握するために必要な要素です。この遠近感を再現するために用いられる技
術が、テクスチャ表現です。
テクスチャ表現とは、質感のことであり、物体の色や質感、光の情報な
どから、現実世界のようなリアルなビジュアルを3D空間に表現する技術
を指します。テクスチャ表現による遠近感の再現が行われなければ、3D
空間は不自然に見え、没入感の低下につながってしまいます。
テクスチャ表現を実現する技術
ミップマップは、遠近感にもとづいたテクスチャ表現技術の一つです。
異なる解像度のテクスチャを複数用意し、視点からの距離に応じて適切な
解像度のテクスチャを使用します。近くから見たときには高解像度のテク
スチャを使用し、遠くから見たときには低解像度のテクスチャを使用しま
す（図6-9）。
このように遠近に応じたテクスチャの切り替えをすることで、テクスチ
ャのぼやけを防ぎ、より自然な視覚表現を実現することができます。
ミップマップは高速化の手法
ミップマップは遠近効果によってリアルな3D空間を得られる一方、高
速化の手法としても知られています。なぜなら、距離が遠くなると高解像
度の画像から自動的に低解像度の画像に切り替わることで、描画速度が向
上するからです。また、高解像度のテクスチャを大量に使用する必要がな
くなるため、メモリ使用量の削減にもつながります（図6-10）。
このようにミップマップを活用することで、画質を保ちつつ描画速度が ...
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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.