Hey guys. I’m using the Physx Cloth plugin in Maya to create some APEX clothing for some flags I’m making. I managed to get the flag to simulate in Maya and get it imported into UE4. However, after I apply the .apx file onto the flag section of the skeletal mesh, it just disappears, leaving only the flagpole visible.
Here’s what it should be like in engine.
Without APEX clothing applied.
With APEX clothing applied.
Any ideas? 
check your scale settings when exporting im pretty sure the issue is there
I’m having the exact same issue: cloth part of mesh disappears when APEX clothing asset added (tried with both .apb and .apx).
Did adjusting the scale settings work? I’ll let you know if I figure anything out.
To tell you the truth I’ve not actually tried! 
I’ve been super lazy over the past few weeks haha! I did get the project finished for my class however. I hope to expand on it more, and I managed to get it accepted to this years DiGRA exhibition. You can check it out here - Thiepval - Stuart Vivers - 1200215 - Spatial Constructs - AG0934A - YouTube
I’ll get back onto maya and see if I can’t fix the apex issue this week. Will post back if I get anywhere!
Okay, here’s the solution (for me, anyway). It does indeed have to do with scale.
Start your Maya or Max model from scratch to make sure your units and scale are right. I was initially working with a version of a very old Maya file I’d messed around with in the past for Unity cloth, and the units were messed up no matter how I adjusted it.
When setting up in Maya or Max, make sure your units are set to what you want. In Maya this is under Display > Grid (click the options box to the right of “Grid” label):
Create your model w/ the cloth mesh, etc. (Tutorials / guidance on this elsewhere.) The larger the scale of the cloth meshes, the better, in my experience.
When exporting for Unreal (as apex or physx file), you need to check AGAIN that your units are correct. Maya will sometimes, for example, try to export in Meters even when your whole scene was created in Centimeters. You catch that and correct it here:
(Though again, when I changed this from M to CM on a pretty old Maya file I’d gone back to, it didn’t help. When I changed it on a new file started from scratch, it exported perfectly.)
Hope this helps anyone who may be struggling with this.
