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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24
リアルタイムレンダリング、解像度、リフレッシュレート
XRと密接するテクノロジー①
1-7
リアルな仮想空間を描くCG技術
CG とは「コンピュータ・グラフィックス」の略称で、コンピュータで描
いた画像や映像、または技術そのものを指します。XR の仮想空間はすべて
CG で作られるため、そのクオリティがXR 体験の臨場感を左右します。
特に重要なのが、動きに合わせてCGをリアルタイムで生成・更新する
リアルタイムレンダリングです（図 1-13）。CG画像のスムーズで自然な
切り替えがリアルな仮想空間を描くうえでのポイントとなります。
ユーザーの動きを感知するセンサー技術
XRでは、現実のユーザーの動きを仮想空間に反映するため、デバイス
に搭載されたさまざまなセンサーを駆使しています。このユーザーの動き
を感知して追跡する技術をトラッキングといいます。
トラッキングは、感知する動きの方向の数により3DoFと 6DoF の 2 種類
に分けられます。3DoFは、頭の上下左右の回転と傾きを感知します。一
方、6DoFは頭の動きに加え、身体の上下左右前後の並進移動も感知しま
す。これにより没入感の高いXR 体験を提供できるのです。
没入感を生み出す高精細なディスプレイ技術
XRの没入感を高めるには、映像を映すディスプレイ性能が大きく影響
します。特に重要なのは、映像のリアルさを左右する
解像度とリフレッシ
ュレート
の2 つです（図 1-14）。
解像度とは、画像を構成する点の密度のことで、ドットやピクセルで表
現されます。解像度が高いほど、鮮明で高精細な映像が表現できます。リ ...
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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.