(1) If you have long and skinny breaklines there is now an option to add in extra points along them. Leads to better contours around the previous long skinny triangles. Find option under Options menu - Fix breaklines.
(2) CDS can now display multiple surfaces at the same time. ie triangles, contours and coloured surfaces. This can be used for a couple of practical applications. For example you can create two surfaces that but up against each other and can create contours that don't have to match along the edge. One example is grading two fields side by side, where we want to assume a cliff discontinuity between the two.
Another example is displaying natural and as-built contours on top of each other.
To set the surfaces to be displayed go to File - Plot Parameters - Contours. Set the surfaces in the list box. If nothing set only current active surface is shown as at present:
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