Displacement UV seams appearing in render

Yerus · May 2019

Hi,
I have a displacement map seams problem, as displayed in the image. It happened to practically
every work I have made by generating a displacement map in ZBrush and then applying it to Maya.
The configs I always use are 0.5 mid value, 2048X2048, 7 of bleed.
I attempt to smooth the border out in Photoshop as much as I can. My current map is utterly even and spread out in bleeds.
In Maya my smoothing configs are unchecked to affect UVs, the model gets subdivided when rendered and every other map seems to be working just fine.
Generally, when I smooth the map out in PS, the seams almost desappear, but not in this case.
I suspect it has to do with a “shapeOrigin” thar has been created from my model for whatever reason, can i be right, or it’s none of that matter?
What do you guys imaging to be wrong?

Image: https://us.v-cdn.net/5021068/uploads/editor/rh/6jbimqvhqidb.png

oglu · May 2019

Could you show the topo without displacement? Displacement does need a lot of poly, a good topo and super clean uvs.

gnoop · May 2019

Is it Arnold? I think Arnold has a feature of stitching those seams automatically even on UDIM patches .Also the geometry shouldn't have splits, hard edges. It's based on my Max experience although, not Maya

musashidan · May 2019

Post an image of your ZB disp settings? I've never had seam issues using disp from ZB in Arnold.

Yerus · May 2019

Here is my UVs, topology and my display properties (is this what you asked for musashidan?)
Btw, I'm using V-ray, I forgot to tell.

Image: https://us.v-cdn.net/5021068/uploads/editor/r9/8mmsr573camy.png

musashidan · May 2019

Not your display properties, your Displacement export settings.

Yerus · May 2019

musashidan (*my map border is at 7)

oglu · May 2019

You need much more texture resolution. The head alone needs a 4k map to get the needed detail.

musashidan · May 2019

Also, you should be exporting a 32bit .exr. That way it's straightforward on the other end, Vray or Arnold or whatever. Your UVs should be packed a lot better(or use UDIMS) The face(most important part of the character) is only using about 10% of UV space. The face should be on its own separate UDIM tile.

Yerus · May 2019

I see. Is this seams problem a result of bad file packing and UV distribution then?
Is there any way I can mend this for now? Time is on me.

musashidan · May 2019

Well, our proposals should take about 10mins. They are the fixes.

Also, drop dsubpix to 0. It has no effect on the result and adds needless time to the bake.

Yerus · May 2019

Got it. Thanks for the help!

Yerus · May 2019

After a couple hundred trials I finally found a way fixing the problem: simple putting in a 50% grey collor at the seams.
This totally melts the seams problem.
Again: thanks 4 the help, I did not know this UDIM workflow!

musashidan · May 2019

Sorry, I forgot to tell you to set your mid value to 0 when exporting the map(or you can set this in Vray after) Either way glad you got it sorted.

Displacement UV seams appearing in render

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