The Head tab

The Head tab is where a GNM face is made: roll a new face with Generate GNM, steer it with gender, ethnicity, seed and age, and change only one part with the region chips. On a MetaHuman the same tab holds its Base group, its Face Mixer and its Aging.

TabHeadGroupsface mixer, identity; on a MetaHuman: Base, face mixer, ShapeFacesGNM faces, in the right panelUndoCtrl+Z on this tab

The Head tab on the GNM head: the face mixer and identity groups on the left, the GNM faces on the right, Convert to MetaHuman at the bottom right of the view.

Usage

Press Generate GNM for a new face. Only the face changes: gender, ethnicity, seed, age, skin and eye colour. Your hair and the rest of the look stay.
Lock what you want to keep with the padlock beside it, and press Generate GNM again.
To change one part only, light a region chip (Eyes, Nose, Mouth, Jaw or Head) before you press Generate GNM.
Set age with its slider: lines come in and the hair greys with the years.
Keep a face you like with + Save this face under the GNM faces. See Faces libraries.

identity

Control	What it does
Gender, Ethnicity, Seed	What the face is generated from. The padlock beside each holds that value when you generate.
Age	18 to 70. Ages the skin, with lines from about 30 that deepen to 70, and greys the hair: a little from 40, mostly grey by 70. The face's shape stays. One drag is one undo step.
Caricature	How far from the average face each Generate lands. 1 is the default.
Eyes, Nose, Mouth, Jaw, Head	Restricts the change to one part. One at a time; click the lit chip to clear it.
Generate GNM	Rolls a new face, skipping what you have locked.
Add to A, Add to B	Puts the face on screen into the Face Mixer's slot A or B. See Face mixers.
Reset	Clears the regions and identity, and puts caricature, the deformers and the skin hue back.

On a MetaHuman

On a MetaHuman the Head tab shows three groups instead:

Base, on a converted character: Import MetaHuman DNA… and Back to GNM. See Convert to MetaHuman.
face mixer: the MetaHuman Face Mixer. See Face mixers.
Shape: Aging, from 0 (the head as it is) to 1 (the full aged shape). Double click for 0. BMI Face is on the Body tab.

TipFor a whole character, hair and accessories included, use the Generator. The Head tab changes the face only.

Common problems

What you see	Why	What to do
Generate changes nothing	Everything is locked.	Open some padlocks.
Generate changed only the nose	The Nose chip is lit.	Click the lit chip to clear it.
Generate GNM is missing	A MetaHuman is on screen.	It is a GNM head tool. Use Back to GNM, or the MetaHuman faces library.