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How to Tile a texture Without Seams-
There are two methods I am going to illustrate below for tiling a texture. Both use Adobe Photoshop, although there are easy ways to do this in many programs. For a neat look at how to tile a texture in Zbrush, CLICK HERE and scroll down to week 7.

STEP 1: FIND A GOOD SOURCE PHOTO

A word of advice... if you ever need good source material for enviornement textures, take your digital camera to Home Depot! Bathrooms, Kitchens, Lawn and Garden... all right there. This photo was taken in a similar enviornment. So go one afternoon and take about 300 snapshots, and you'll have your own texture library for life!

STEP 2a: CROP THE IMAGE

Drag a perfectly square selection over a part of your high-res photo by holding down Shift, then crop under Image-->crop. In our first demonstration of technique, we are going to also drag out two selections, one from the top and the other from the left, copy those, and paste them on new layers above our background image. See the image below:

STEP 3a: FLIP THE COPIED SECTIONS.

Our next step is to Flip the sections that we pasted. The red section (from the image above) we will flip vertically, and the blue section we shall flip horizontally. This is done to match up the edges on each side of the document.

STEP 4a: USE THE ERASER AND CLONE STAMP TOOL

I will typically use a combination of those two tools to blend together the edges and unify the surface. This file is now ready for Maya...

STEP 2b: LETS DO THIS AGAIN, DIFFERENTLY

We can also use the Filter-->Other--->Offset function in Photoshop to skip steps 2a and 3a above. If we are usinga 1024x1024 texture as we are here, you can see that by offsetting the image at 512x512, the corners of the photo are now displayed together in the center.

STEP 3b: USE THE CLONE STAMP TOOL (AGAIN)

Same as above, we are painting out the seams. I also used the dodging wand and saturation sponge to even out the tones. This file is now ready for Maya...

STEP 5: APPLY IN MAYA

Add the image to a plane. Note that the repeat UV is still set to 1 by 1.

STEP 6: ADJUST THE REPEAT UV VALUE

Here you can see the image repeated 3 times in each direction. While this certainly begins to form patterning, the seaming is flawless, and the tiling is far less noticeable than without these adjustments.