One minus node is broken within materials in UEFN

Wertandrew · February 12, 2026, 5:11pm

Summary

Check attached image that compares the exact same material setup in UE5 and UEFN

Please select what you are reporting on:

Unreal Editor for Fortnite

What Type of Bug are you experiencing?

Assets

Steps to Reproduce

Hold U and click within a material. Connect the to a component mask on R, then to one-minus node, and preview that node. Do the same in both UE5 and UEFN and see the difference

Expected Result

One minus is actually one minus

Observed Result

one minus is does something different, as if its also plugged to a power node as well.

Platform(s)

pc

Upload an image

Wertandrew · February 12, 2026, 5:23pm

Even if you avoid the one minus node and Multiply by -1, then add 1 (which is the same), you get the same broken result, which makes no sense

Astrotronic · February 12, 2026, 5:40pm

Hi Wert,

I just tried to reproduce this in my UEFN project and I was unable to.

I’m reminded of mobile renderers that use a lower float precision for gradients… (There’s a ‘Float Precision Mode’ setting in the material, but I’m not seeing any differences when toggling between them)

Do you have any settings changed in the Material? Do you also see this in other projects?

Wertandrew · February 12, 2026, 5:40pm

I am not sure whats up with this layout, but I cant repro this on a new material in UEFN, not sure how I managed to do this, but it has happened to me before. Feel free to disregard ticket, will just leave it for reference in case someone bumps into it.

The solution is to have the UV scale be equal for it to work.