Question 1

Can I pack AO / Metallic / Roughness into a Unity Mask Map without Substance Designer?

Accepted Answer

Yes. Channel Packer (https://gameimagekit.com/en/tool/channel-packer) builds Unity Mask Map or Unreal/Godot ORM in the browser, then you can send it to Format Convert for KTX2/DDS. Nothing is uploaded.

Question 2

Are my images uploaded to a server?

Accepted Answer

No. Decoding, channel extract, resize and packing all run locally in your browser.

Question 3

Which preset for Unity, Unreal or Godot?

Accepted Answer

Unity URP/HDRP Mask Map → “Unity Mask Map”. Unreal Occlusion-Roughness-Metallic and Godot ORM share the same channel order — pick the matching ORM preset. Metallic + smoothness only → “Unity Metallic-Smoothness”. Otherwise use Custom and assign slots yourself.

Question 4

I only have roughness, not Smoothness.

Accepted Answer

Unity Mask Map alpha expects Smoothness. Assign roughness to A and enable Invert, or drop a file named _roughness — the tool wires it to A and inverts. A _smoothness file is used as-is.

Question 5

Can I use this with the normal / height tool?

Accepted Answer

Yes. Generate _h / _r there, send them to the tray, then drop them here. Any grayscale map works. After packing, send to the tray and open format convert for KTX2 / DDS.

Question 6

What if source maps have different sizes?

Accepted Answer

Output defaults to the first assigned map’s size. Switch to the largest map or a custom size. Use nearest-neighbor for pixel art / hard edges, bilinear for photo materials. A warning appears when sizes differ.