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// upd. code -> https://gist.github.com/Julli4n/13016b11e80109ba643ab9e90b431e02#file-ok-js-L7
// this is an example i use for my avi.

$.ajax({
  method: "POST",
  url: "https://avatar.roblox.com/v1/avatar/thumbnail-customization",
  contentType: "application/json",
  data: JSON.stringify({
    "camera": {
        // Ranges are inclusive.
        "distanceScale": 0.7, // 0.5 to 4 (Closeup) 1 (FullBody) - Camera distance scale from the avatar
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        "fieldOfViewDeg": 15, // 15 to 45 - Camera Field Of View (FOV) in degrees, slight effect
        // xRotDeg used to exist here.
        "yRotDeg": 0 // -60 to 60 - Camera Y rotation in degrees
    },
    "emoteAssetId": 10147919199, /* The assetId of an emote you own. 0 for no emote. 
    * example: 3696763549 in https://www.roblox.com/catalog/3696763549/Heisman-Pose
    */
    // idleAnimationAssetId used to exist here, it has since been removed.
    "thumbnailType": 1 /* The thumbnailType
    * 1 = Closeup (headshot)
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    * 2 = FullBody (bodyshot)
    
    Closeup and Fullbody can have separate configurations.
    */
  })
})
// Logs `{success:true}` if success or text if failed
.then(data => console.log(data)).fail(error => console.log(error.responseText));
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