When a line is not parallel to any of the sides of an isometric blockout, it is a non-isometric line.

To construct a non-isometric line we need to take measurements from an orthographic view. Here it is a plan view.

The measurements taken from the plan view are transfered to the isometrc blockout to find points. Join the relevent points tofether to create a non-linear isometric line.  

Some isometric images will have curves. 

Again an orthographic view is used to find a series of points on the curve. The distances of these points are taken from a linear isometric line. 

This linear isometric line then provides a reference to mark all the point distances from. Once the points have been mapped, join them to create a curve. 

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