The new adaptmesh option of the plot3d command provides for automatic adjustment of the independent values of the data points in order to display smoother edges for surfaces which are non-numeric in some part of the specified rectangular domain.
In previous releases, the surface appeared as it now does with the option given as adaptmesh=false. The new default behavior is adaptmesh=true. In the following two graphs, the default behavior in Maple 2020 is shown on the right.
With the option set to true the result contains a MESH structure, while with the option set to false the result contains a GRID structure.
The data values can still be extracted using the plottools:-getdata command.