Technically speaking, in an Isometric drawing (Iso meaning equal) the angle between the x, y, and z axis which define the Isometric plans are equal. 360 degrees/3 = 120 degrees (or 30 degrees from a horizontal line).
When I checked out Xara's Isometric grid, it seems its angles are 116.57, 116.57, and 126.86 (or 26.57 degrees from a horizontal line). Which I believe is a Dimetric configuration.
I just noticed this when I imported some isometric drawings made in another application. It may be an important issue for some people.
I would appreciate it if those interested would check it out for themselves and verify if what I have posted is valid. Thanks.
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