Different applications use different techniques to calculate the padding. If it looks a little different in the empty space this is unlikely to cause any problems. Generally, Eric's advice makes sense but the padding distance applies more to when the textures are viewed from a distance at lower mipmips. At mip 0 this…
It's likely that your padding amount is too low. 8k will need 64 pixels of padding outside each UV shell, so you need 128 pixels in the gutters between the shells. I would suggest adding more padding, just completely fill the empty gutters with padding. Photopea has a fast padding filter, and you may need to run it a…
It looks like you have smooth uv checked in the multi map exporter settings.Try turning it off and also turning it off in the subdivision settings in your render package. I'm not familiar with blender, but it could be 'none' or 'linear' maybe? Also worth checking this…
I don't see seams on lowpoly mesh, it looks like that in Blender viewport for example: Maya and Blender have some smoothing settings for UVs, but in Zbrush I am not sure how can it be. For example I have a highpoly and lowpoly meshes, and I do "projectALL" LP on HP or just copy+paste UVs in UVmaster zplugin if necessary. I…
I am using Maya Arnold, but I think it's not a "limitation of renderer" because in Blender the model with displacement has the same artifacts in viewport. In Maya there is a setting "Bounds Padding", but it does noting to render. By the way, thanks for the answer. I did a few more "tests". And I noticed that padding lines…