I’ve spent all day on the same problem! Unfortunately, documentation on these aspects is virtually non-existent, lol. It seemed mysterious that changes made to the GoboWheel_Table or the linked textures were having no effect.
Eventually, I managed to figure it out. The answer lies in the “Clean Disk” and “Frosted Disk” (T_GoboDisk_01_Clean and T_GoboDisk_01_Frosted). These need to be copied to your project folder and then edited too, and then the Gobo component of your copied BP_MovingHead will need to be updated to reflect these as well.
I’m just not entirely sure yet how to perfect the alignment. I see there’s a M_BakeGoboDisk.uasset in Plugins\DMXFixtures\Content\LightFixtures\Tools which I’m guessing (from what the name suggests?) that it somehow bakes all of the individual textures from the GoboWheel_Table into the GoboDisk texture automatically? or perhaps does something else on runtime? I have no idea on that, though..
Result:
Hope this helps you too ! Good luck