The angles will be off a very small amount when you expand appearance of the default. I thought the math might be slightly off for the default 3 values, but even if you make 2 of the settings 0 degrees you will still get not perfectly perpindicullines.
This is easily fixed though selecting points with the hollow arrow tool and doing object >> path >> average
3D Effect doesn't really do isometric (parallel perspective, or orthographic projection). It only approximates it by using a very distant perspective.
Draw a cube with it set to "isometric" and you'll also find that the left and right edges are not angled at exactly 30 and 150 degrees.
is not negligible, either; not when you need to "build" illustrations of multiple objects.
Well, not to spell out the obvious: Since isometric drawing means just skewing shapes around, in most cases drawing such stuff conventionally using normal blends or angled gradient fills is much more efficient... Using the effects in this scenario strikes me as not the most efficient way to go about the matter...
Since isometric drawing means just skewing shapes around...
Isometric drawing is far more than "just skewing shapes around."
in most cases drawing such stuff conventionally using normal blends or angled gradient fills is much more efficient...
Depends entirely upon what you're drawing. Many subjects are more expedient to draw/shade with 3D Effect than to construct manually.