The Copy (Instance) Map dialog opens when you copy a map by dragging and dropping a map button. It gives you the choice of copying the map, making the newly assigned map an instance of the one you dragged, or swapping maps.
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Material Editor > Parameters rollout or node display > Drag one map button to another.
You can drag map buttons within the Maps rollout, within the Basic Parameters rollout, or from one rollout to the other.
Tip: When you use the same map for multiple parameters, such as both self-illumination and opacity, it is usually easier to work with an instance rather than a copy.
- Instance Makes an instance of the map you dragged.
The newly assigned map is not independent. Adjusting the parameters of one map or the other changes both of them.
- Copy Copies the map you dragged.
The newly assigned map is a copy whose parameters you can adjust independently.
- Swap Swaps the maps. This option doesn't appear when you drag from one rollout to another.