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The isometric view is based upon a rotated grid view view at an elevation. This gives a diamond shaped grid as shown below. It provides a three dimensional, perspectiveless representation of an object or objects and is particularly favoured for engineering models
Traditionally, the isometric view is based upon a 30° angle, however, on a computer screen this angle will give an irregular and messy looking diagonal line as can be seen in the diagram below. For this reason, an angle roughly equivalent to 26.565° is used as it creates a neat and clean line.
Of course this magic figure of 26.565° is fairly useless when pixelling really. All you need concentrate on is the one up, two across principle of drawing lines. If however, you are trying to use a texture or something as an overlay without actually pixelling it isometrically, then this figure is important when you skew your picture to get it at the same angle.
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