Delete unused nodes

[tonyboy]

I search a mel command which can (at the end of my mel programm) delete all unused nodes.
In fact, i want to write in mel the same thing that you can do in the hypershade : Edit -> Delete Unused Nodes

Thanks a lot for your help...

Tony

[jeffd]

We had a situation go on at our studio in which months and months of importing scenes to each other and back into themselves led to thousands of bogus unused nodes in our scenes causing slower loading times and file bloat.

Deleteing these nodes in a loop was really slow. I found it easier to get the nodes I wanted to keep and Exported Selected them to their own clean scene. Just a heads up for you.

--JeffD

[gnip]

If you haven't done this already, you can turn on the "Echo All Commands" option from inside the Script Editor (Script -> Echo All Commands).

I'm on Maya 4.5 and it came up with...
hyperShadePanelMenuCommand("hyperShadePanel1", "deleteUnusedNodes");
...when I did the "Delete All Unused" from Hypershade.

There is also the "File -> Optimize Scene Size" menu option. It deletes a lot of unused nodes.

If you want to do it yourself, you could also loop through all of the nodes in the scene and count how many connections each node has:

int $numConnections = size(listConnections $node);

This will get you closer. But, be careful... Just because a node has 0 connections doesn't mean you can delete it. For instance: transform nodes. Often, they aren't connected to anything, but you don't want to go deleting them!