A method and system are for acquiring a dataset created via an imaging modality, the dataset describing a 3D-shape of a 3D-object； adapting, in dependence on the 3D-shape of the 3D-object, a flat 2D-grid of intersecting grid lines to follow a surface curvature of the 3D-object to create an adapted grid, a distance between two neighbouring intersections, along the grid lines of the adapted grid following the surface curvature of the 3D-object, being equal to a respective corresponding distance between a respective two neighbouring intersections of the flat 2D-grid before the adapting； and outputting the adapted grid for display over at least one of the 3D-object and a virtual model of the 3D-object.
