In your first plot there is no easy way to make the edge circular. However, other than a small detail, you got it in the second plot. It you put F1, F2, F3 in the placeholder then Mathcad interprets that as three plots, where the the z values are given by F1, F2, and F3, and the x and y values are the points on a rectangular x-y grid, determined by the quickplot parameters. If you replace that with (F1, F2, F3) Mathcad interprets that as a single plot where the x, y, and z values are given by F1, F2, and F3. Then you will see what you are looking for.
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