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Ability to change the camera FOV - to check the face using different perspective settings
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Ability to take snapshots of the current state (save versions) and then blend between them
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Ability to remove skin texture and assign a blank color and default normal to the face (or maybe just a high frequency normal with pores only, no big and medium facial forms)
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Same for the yes, ability to remove the sclera color (weins - redness) completely
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Load up custom HDRIs for lighting
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Send the Metahuman Creator lookdev scene into the actual level
Feel free to add to the list.