{"abstract":[{"text":"Identifiers for specific facial features, for use with coefficients describing the relative movements of those features.","type":"text"}],"hierarchy":{"paths":[["doc:\/\/com.apple.documentation\/documentation\/technologies","doc:\/\/com.apple.arkit\/documentation\/ARKit","doc:\/\/com.apple.arkit\/documentation\/ARKit\/ARFaceAnchor"]]},"identifier":{"interfaceLanguage":"swift","url":"doc:\/\/com.apple.arkit\/documentation\/ARKit\/ARFaceAnchor\/BlendShapeLocation"},"kind":"symbol","legalNotices":{"copyright":"Copyright © 2026 Apple Inc. 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For each key in the dictionary, the corresponding value is a floating point number indicating the current position of that feature relative to its neutral configuration, ranging from ","type":"text"},{"code":"0.0","type":"codeVoice"},{"text":" (neutral) to ","type":"text"},{"code":"1.0","type":"codeVoice"},{"text":" (maximum movement).","type":"text"}],"type":"paragraph"},{"inlineContent":[{"text":"ARKit provides many blend shape coefficients, resulting in a detailed model of a facial expression; however, you can use as many or as few of the coefficients as you desire to create a visual effect. 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