Yeah this is the one issue with tesselation.  You need to be mindful of how you unwrap your model.   You should already be mindful but basically it works best if you have no uv islands at all and unwrap all in one piece.    When I first saw this i thought it was something I was doing wrong I had to go read up on it to realize that in fact its working just fine  




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"You have brains in your head. You have feet in your shoes. You can steer yourself in any direction you choose. You're on your own, and you know what you know. And you are the guy who'll decide where to go."
                                                                                                                                                                                                                                                                                     Dr. Seuss

you mean ...................................Sw00000p is right???

So how do I make the vector displacement works like it should be in any renderer without these lines inside iClone? 

In the video tutorial from RL, on the warrior's shoulder pad it looks smooth, no cracks and that's what I'm trying to achieve, I think it's a settings issue either in the export of ZBrush or inside iClone but I have no clue how to fix it.
BTW - My UV is just one piece, one island and it works perfect on the diffuse no weird issues it's a simple shape.

It is extremely dependent on the UV's, so use it where it does not cross UV lines. If you look at the examples RL provides, you'll see that they are using really basic shapes. The whole front of the shoulder guard has no UV lines going across it (it is a single UV island). It looks to me like it may just be a planar UV projected on the Z plane. Anyway, the displacement is just moving a contiguous surface, and that is what you want.

Could you post a picture of your work?

Thanks for trying to help me in this, I appreciate it

OK, so I think what you mean are the seams who splits the one island, but this is not the problem I refer to, the UV itself looks very smooth as you can see on the 3DX screenshots. I mean it's not the best UV map (not in center for example) but it works for the purpose of none-character asset. can't see the seams if I roatate around it, it's all looks as one piece which is good so far.

The problem appears when I add a Vector Displacement map on the object in iClone (I don't know how to add Displacement Maps in 3DX, maybe I miss it).
The screenshot of inside iClone with Vector Disp loaded, it's hard to see the weird black cracks all over the model in the screenshot but it's there. I didn't mess with tessellation or anything it's on default to show the problem I get.
I just want to use Vector Disp so it will give me all the details and "real" extra geometry so I do this test in order to learn how to do it correct, so far... no luck as you can see.

So the cracks all over the model like it splits it to many cube-like cracks with spaces... as you can see on the second screenshot. I wonder what I do wrong, and how can I fix my mistakes this weird thing ?

The object: Low-Poly and High-Poly and all the maps created using the Multi-Map plugin inside ZBrush, no other external software. (100% ZBrush, is what I'm trying to accomplish for assets, if it can be done with no errors in iClone).
The only thing I couldn't get in screenshot is the UV map in wireframe, ZBrush never shows me the wireframe of the UV even on polyframe mode... and it supposed to work. but you can get the idea of the UV map from the diffuse map it is very basic.

3DXchange imported .OBJ with Diffuse and Normal map:   (showing the other maps just to get the idea)


Apply to iClone:


Loading the Vector Displacement map to show the problem of the weird black blocky cracks all over the object:


Zoom in to show the cracks in order to understand:  (Tessellation on default, I didn't mess with it yet)

LOL I dont know I hate to say it, but I dont read much of what he says.     I have figured how to use islands when using tesselation but they need to be strategically placed.  



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"You have brains in your head. You have feet in your shoes. You can steer yourself in any direction you choose. You're on your own, and you know what you know. And you are the guy who'll decide where to go."
                                                                                                                                                                                                                                                                                     Dr. Seuss

You might want to make sure your vertexes are welded. There is a box in 3DX to do that. It is right below the "smooth" settings.

Displacement is iClone only, there are no settings for it in 3DX, so you're good there.