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I'm working on a game in Unity that uses this model as a base, allowing players to create their own character using sliders. I know Unity has support for Blendshapes which I intend to use for facial expressions. In older games I noticed that some used their armature to change the characters, though I'm not sure if that's still the case these days. Others have a few base shapes and interpolate between them, I think even Fallout 4 does this but then again it's Bethesda's using the same engine since last millennium.

Should I create the sliders for the face and body using bones in a rig or blendshapes? Is there a standard practice for this?
If I should use a rig, should I keep it separate from the animation rig or integrate it into the skeleton?