This option uses a result component, or a scalar value, and draws a 3D surface above the mesh following the normals of this mesh. It can be seen as an extrusion of the mesh along its normals with the result as factor, like the beam diagrams but with surfaces.
With the Show elevations
option inside the menu Options -> Result Surface, you can choose how the elevations (lines or faces that connect the result surface with the underlying mesh) are drawn:
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None:
The mesh and its result surface are drawn separately, without interconnecting lines or faces.
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Extruded nodes:
Lines are drawn between the original nodes of the mesh and the extruded ones, i.e. the nodes of the result surface.
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Extruded edges:
Faces are drawn between the original edges (of the elements) of the mesh and the extruded ones, i.e. the edges of the result surface.
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Contour fill:
Switches On or Off the contour fill representation of the result used to create the 3D surface.