struct.node.surface.xdir
Syntax
- v := struct.node.surface.xdir(sn) (3D ONLY)
- struct.node.surface.xdir(sn) := v (3D ONLY)
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).
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