Displacement Map Seams

[exood4studios]

Hello there. I added detail to my Maya model in ZBrush and I successfully exported a displacement map using the displacement button on the tool window. I then apply the displacement map to my model back in Maya and everything seems okay until I render the back of my model where the seams are in my single pelt mapped UV. I try to fix it in photoshop and have done pretty much everything but they still appear. I'm getting the feeling that the seams aren't affected by the bump value and that's why they're left pushed down. What's weird though is that I tried to apply the same color value to the areas with seam so that they blend with no bump value seam but I still get some. Any ideas guys? Thanks.

[joojaa]

object normalspace gets flipped so the interpolation on those on edge samples are off. Theres 2 things you must do, 1 you should dial late your map edges. Second you should change your shader internal code. The first helps some the second is hardcore.

[exood4studios]

Dial late? Internal code? I'm sorry Jooja but I have never heard of those things yet. Can you please elaborate for me? Thank you.

[fortner_mike]

Thats the whole point of any texturing/UV mapping work...to make the stretching and seams disappear. The only solution i see is just to edit your map with photoshop until you get no seams. Or try what joojaa suggests, but i have no idea what exactly that is..lol .

[joojaa]

Sorry its a spell checker typo diallate (the spellchekker tries to fix this into dial ate), its a image processing method where the color of the pixel is bled to the next.

diallate is the reverse of erode and it does this quite automatically ofcourse you can diallate manually too. but needles to say its a lot of work. Photoshop does not have diallate but you can quite easily make one out of blur and adding.

PS spell checkers can sometimes save readability yes but they can also destry the neire message :`)

[exood4studios]

I see. What about the shader internal code thingy? I've never heard of it. Can you elaborate, please? Thank you.

[joojaa]

Forget it, it owuld take me way too long to explain. Fist id have to teach you to write code and then pour in some higher order calculus, and computational science in. And youd still need to diallate the map.

I can however tell you how to do diallation in photoshop, if you can tell what version of pr you are using.

[exood4studios]

I understand. I'm using Photoshop CS 9.0. Thanks for the reply.

[timster]

QUOTE(Joojaa @ 08/08/07, 12:56 PM) [snapback]271200[/snapback]
Forget it, it owuld take me way too long to explain. Fist id have to teach you to write code and then pour in some higher order calculus, and computational science in. And youd still need to diallate the map.

I can however tell you how to do diallation in photoshop, if you can tell what version of pr you are using.

Hi - I'm having a similar issue to 3bpms... am using tiled segments of the lunar surface as displacement maps on corresponding poly tiles... seams are visible in renders and are big or small depending on camera position (also dark edges are visible in hardware shading which aren't in disp. map files). Not sure if I should be mapping onto a complete sphere but still suspect there would be seams... is a workaround to dillate the maps, and how is this done (using Photoshop CS 8.0 or Shake)? I'm rendering in mental ray - but could try renderman. Any ideas?! Thanks.