struct.node.surface.xdir
Syntax
- v := struct.node.surface.xdir(sn)
- struct.node.surface.xdir(sn) := v
Get/set the orientation of the surface system of node sn such that the \(x\)-direction is aligned with the projection of the surface vector v onto the normal plane, which is defined by the \(z\)-direction.
This operation can only be performed upon nodes that have a valid surface system (to ensure that the \(z\)-direction always corresponds with the average normal direction of at least one of the shell-type SELs using the node).
Returns: v - vector Accepts: v - vector Arguments: sn - structure node pointer
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