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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98
インスタンシングステレオレンダリング
ステレオ描画を高速化する技術
5-7
左右の各映像から奥行きを感じさせる
左右でわずかに異なる視点から2 つの映像をレンダリングすると、立体
視効果によって人間の脳は奥行きがあると錯覚します。この錯覚を利用し
て映像をレンダリングすることを、ステレオレンダリングといいます。こ
の技術では、左右合わせて2 回描画する必要があります。
同じものを効率的に複数回描画する
インスタンシングは、同じモデルやオブジェクトを複数回描画する際に
効率的な手法です。通常、同じオブジェクトを何度も描画する場合は独立
して描画する必要がありますが、インスタンシングでは1度の描画コール
で複数の同じオブジェクトを描画できます（図5-13）。
描画には複数の情報が必要になるため、同じオブジェクトを何度も描画
する場合、同じ情報と異なる情報の両方を複数のオブジェクトで持つこと
になります。そこで、同じ情報を1 つにまとめ、各オブジェクトの異なる
部分を設定し描画を行うことで、1度のドローコール（画面に描画する際
に呼び出す命令のこと）で済むようになっています。
例えば、1,200枚のマップチップを描画したとき、通常は1度の描画に
2.3ミリ秒（ms）ほどかかるのに対し、この技術では0.03ミリ秒（ms）ま
で短縮することができ、複数のオブジェクトの描画を効率的に行えます。
2つの技術の組み合わせ
VRでは、この2 つの技術を組み合わせたインスタンシングステレオレ
ンダリング
（Instancedstereo ...
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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.