About the Constraining Filter
Nodes will not be interpolated for voxels in which the corresponding node within the constraining Boolean model has a value of zero (false).
Constraining models are useful for limiting geochemical models to regions defined by other parameters such as permeability.
Constraining models can significantly decrease the time required to generate a model if the majority of the model would otherwise be subsequently filtered (e.g. multiplying the output by a Boolean model).