Want to create skin details, but normals go crazy

Question

I have a human model that UV unwrapped and uses a UDIM system. Nomal painting works absolutely fine. The issue arises when I tried (perhaps in a less than ideal workflow) to add skin details like pores usng perlin noise.
The steps I took:
1. Created a fill layer with only the normal channel activated.
2. Added a white mask and added a 3D perlin noise fractal to the normal slot.

3. Model now suddenly has weird coloration and lighting that is different between UV islands.

I baked mesh maps within substance before starting the paint process, and I'm working in DirectX for Unreal engine support. I've attached a short clip that shows everything. (If embed isn't showing, here's the link -https://youtu.be/QlelVoUfdxY)
Maybe I'm doing something wrong. All I really want to do is add skin details. I'd appreaciate any feedback on this matter. Thanks!

Cyril Dellenbach · Accepted Answer

Hi @Sam062,

Thank you for the message.

This is in fact the expected behavior. The Normal slot expects a Normal map, and a Perlin Noise is a Greyscale map, so not made for this kind of purpose.

Instead, I suggest you to :

Add a Fill layer
Turn off all channels except for the Height
Increase a little bit the Height value
Add a Black mask to the layer
Add a Fill effect in the Black mask
Drag & Drop the Perlin noise inside the Fill Layer effect

Considering Substance 3D Painter natively turns the Height into normal, the result will be what you're looking for.

Best regards,

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