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Isometric tiles that wont fit correctly

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I am developing an isometric engine using d3d for 2d graphics. Now what I dont want to do is conform to making a diamond shaped quad and tiling that way... what I am attempting is tiling by having a normal rectangle quad with an iso tile on it. Now this is all fine and dandy but my textures have this blur (i think) to it I think it has something to do with stretching it or something. Either way it reaks havoc by making the borders visible inbetween tiles. Is there any kind of setting I should have on/off? Response is appreciated, if you have any questions about it please ask... ***KooK Commander*** [edited by - thek00k on November 6, 2003 11:29:49 PM]

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One of the tricky things about textures is that directx uses the center of the pixel. If you see the texture as being composed of square blocks, the edge (0,0) is also the edge of a pixel and not the center of the first pixel.
For a 128x128 texture, the center of the first pixel is (1/128,1/128)
A 4x4 texture has the pixel centers at 1/8, 3/8, 5/8 and 7/8.
If your texture should map properly onto a square they should vary between 0 and 1 for U/V.
Then the left top point of this texture is at -1/8,-1/8 and the right bottom point is (1 1/8,1 1/8)

If you map a 128x128 texture onto something, eg. a square, the top left corner has u,v coordinates (-1/128,-1/128). The bottom right has u,v as (1 + (1/128), 1 + (1/128)).
If you just use (0,0) to (1,1) you get a 1/2 pixel wide border between adjacent textures.

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