I have some nodes on layer 1 and some nodes on layer 2.  Many links are between nodes of the same layer but some are across layers.  I would like a way to easily hide links between layer 1 & layer 2 nodes so that when I hide a layer the broken links are not shown.

[1] -> 1 -> [1] -> ? -> [2] -> 2 -> [2] -> ? -> [1]
where:
[] are nodes with a layer index
-> -> is a link with a layer index

Turning off layer 1 will continue to show nodes with layerindex 1 and the links marked with a question.

The links marked with a ? are neither layerindex 1 or 2 since either may be hidden.

Many layers exist so the combinations will become very tricky (layer index n = outgoingindex -> incomingindex ).