Extrusion is a new kind of legend that has been created in the 3D plugin. This legend is used to extrude any primitive type (points, lines and polygons) that contains a vector layer in function of a given multiplication value.
A more technical definition of extrusion is:
Generating an object of dimension n+1 by the extension of a object dimension along a defined range in an additional dimension.
To use this new type of legend we have chosen to display as 3D vectors the layer that has been inserted in the 3D view.
Open the legend window and select where it says Extrusion. This window looks much like the legend of unique values. The following screen appears.
Choose the field on which you want to extrude and the extrusion level you want to apply. Click on the button to add all and accept.
Extruding polygons.
Extruding lines.
Extruding points.
