Intact.Simulation for Grasshopper can restrain surfaces or meshed surfaces to be fixed in all (default) or mixtures of coordinate directions.

To create a restraint, select the Restraint Block from the Intact.Simulation Plugin tab and click on the Grasshopper canvas to add it.

Once the Restraint Block is added

to Rhino to extract the faces which will be restrained. To extract the surfaces, go to [Solid] in the Rhino toolbar and select [Extract Surface]. Once the Extract Surface operation has been selected choose the faces to restraint and extract those surfaces.

Once surfaces have been extracted, right click on the geometry input labeled “G”. If there are multiple restraint faces choose the [Set Multiple Geometries] option, otherwise choose the [Set one Geometry] option. After clicking on one of the two options, choose the extracted surfaces on Rhino.

By default, a restraint is applied in all three coordinate directions when first created. To create partial restraints, right click any of the “X”, “Y”,“Z” inputs and change their values to false.