In the upcoming GOCAD Mining Suite v19, you can reshape your surfaces and 2D Grids with a spiderweb editing tool.
With this tool, you can reshape the surface in a circle of a given radius. You can enter the radius manually or interactively change it with the middle-mouse wheel.
You will find this tool in the Surface menu > Tools > Surface Editor, in the Edit with Spider Web tab or in the Digitization/ Editing toolbar for surfaces or 2D Grids (when object is selected).
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