I don't know What this is?

I have this model and when i mark seams and Bake the ambiet Occuslion on it and go in texured mode it like has marks where i marked the seams from. Like look at it, It does’nt look right…

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Start over and first get rid of those seams. Then do a more sensible seam set up where you can unwrap things in parts, one part at a time. Say the torso, the arms, hands and so on. This will make a good clean map and the baking will go much better.

There is also a setting to tell how many pixels over the map the bake goes isn’t there? Yeah, it is “Margin” in the bake tab. But I have found that baking goes much better with a good UV map. If not, you do get lots of artifacts.

is there a tut on it?

At first, when I saw that screenshot, I didn’t know what to make of the uv layout, looks like a mess of greebles to me. If it’s because you marked seams for every face, as Richard suggested, then yes, I can see how you end up with that mess.

I cover a bit of the basics on marking seams, uv layout, & baking a normal map in this cartoonish fish series of videos i was working on, you can find them here: http://blenderartists.org/forum/showthread.php?t=198052

In that, I just painted textures, but when placing uv seams you need to think about everything you are going to do with the model, not just ao baking. Say you are going to use a picture of denim fabric on the character. You need to place the seams in places where they won’t be visible or the seams that are different parts of the uv layout won’t match up. For example, inside of the arms is a good place for a seam, since usually arms are down at the sides of the character. A bad place for a seam is the middle of the chest, since that part will be most visible. There are even tricks for hiding seams for textures based on photos, but not any that I am aware of for hiding baked maps like you are doing other than just good placement…

Randy

Second the above and add:

For baking alone and for projection painting all you need is a good even map that does not overlap. That is very easy to do. If you are going to use an image, then you will have to make all of the parts of the UV map connect or there will be seams and stretching. That is harder and more tedious. If you can learn about projection painting it is such a nice way to go. Sometimes you need to uvmap an existing image other times you can projection paint with an image or texture to get what you want. Or a combination of both.

There are tutorials. try google for Blender and UV maps and you’ll find some. Also check out Blender Cookie (look for the blue jeans one) and Blender Guru.