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【Unity】画像トラッキング でエラーとなった場合の対処方法

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最初、トラッキングする画像のサイズが310pxの場合、以下のエラーが出ました。

ARUnityChanTraking[1548:71129] [Session] Session (0x105f53280): did fail with error: Error Domain=com.apple.arkit.error Code=300 "Invalid reference image." UserInfo={NSLocalizedFailureReason=One or more reference images have an invalid size: Fish, NSLocalizedRecoverySuggestion=Make sure that all reference images are greater than 100 pixels and have a positive physical size in meters.,

 幅と高さは、少なくとも480ピクセルにしないといけないらしい。

実装内容はこちらに記述してます↓
かぴばらさんの覚書ブログ nonkapibara

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