Extruded grid
An extruded grid is a generic system of centering suitable for most forms of vaults. It is usually created using a horizontal rectangular or quadrangular grid projected in the gravity direction (Z) towards the intrados surface. This projection may also be understood as an extrusion which is then intersected by the vault surface. The grid should be fine enough so that every voussoir has two lines of support, and it is often created with a two directional interlocking structure (also called a waffle structure), in which the U direction boards are cut in the upper part and the V boards in the bottom part so that they can fit together. The extrusion direction may also be different from the global Z, although in each grid one of the directions should have a constant extrusion vector as to facilitate snapping parts together.
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