Yes , tessellation is hard to work with.
They fixed some things in UE4.26 but didn't test it yet.
I mostly try to fix it with lights and DirectX 12  or I don't use it.

And here's the seams caused by applying the "Force Compute Skin Cache" thing:

76% of original size (was 664x19) - Click to enlarge

I have been having problems with iClone not exporting subdivisions to Unreal Engine. I read in another thread that subdivisions are a GPU thing and can't be exported. I followed the tutorial on how to smooth an iClone character in Unreal Engine ( https://www.youtube.com/watch?v=pdWFvTGAMJ8 ) by using PN Triangles Tessellation. This technique actually works - UNTIL the character moves and dark triangular spots appear at stress points on the skin. I searched and found Bassline303's instructions on minimizing this problem by going into Project Settings > Engine - Rendering > Optimizations > Support Compute Skin Cache (enable this), set Maximum Quality for Compute Skin Cache Per World to 512.0, and Engine - Rendering Overrides (Local) > and enable Force All Skinned Meshes To Recompute Tangents (Also Forces Compute Skin Cache). 
For me, doing this Skin Cache procedure causes an unwanted seam to appear on the character's arms, and also didn't entirely get rid of the triangles until I turned down the Tessellation from 1.0 to 0.25. 

I'm very frustrated about this. Still looking for a better solution to get the characters to look as smooth in Unreal as they do in iClone. 

76% of original size (was 664x19) - Click to enlarge

Wow - this looks promising! Excellent work!

Sure , you can build your own face rig , will work with all CC3 Characters with Mannequin Skeleton ... so all exported from  CC3 or IC with FBX Unreal settings....but the best is , you can rig the morphs too....so cool :cool:
So you only have to build one rig and it will work with all CC3 Characters :)
Also with aiming you can aim your pistol or whatever to a target...a.s.o 

Bassline - can you link the other eye to another box, and the link the 2 boxes together, so that when you move the 2 boxes you move both eyes?

Exploring UE4.26 Control Rig - "Aiming"  (only one Eye & Head)  ... but can be controlled over Sequencer additiv to any animation .. so cool :cool:
Over X-Mas I will try to complete it ... :P
I know , Live Link Face first :)

haha Rob , you got it  :)
When UE4 crashes while rendering with Groom it is mostly a GPU Ram problem.
Try IK also with fbx import , it is crystal clean :-)

Yepp and feet offset in IK ... rest is cool.Where are the Wonder Sisters? :D:P:D

Hello everyone,
Power IK Test
I managed to make a video recording.
I can't tell why it works again (miracle)
I still have to correct the offset for the feet.
I added the camera myself.
Iclone Live Link Camera is not working yet.
When I use Blender Groom Hair.
It crashes while rendering.
Greetings Robert:):)

Yepp, DONE!