What is the "message" attribute for?

[Alan Fregtman]

Hey guys,

I'm sure there's a great answer for this but I can't seem to find it. Everything I've read seems to say that the "message" attribute does nothing, that it's kind of a dummy connection.

Is that so? What is the point of it? To have something you can read connections from later? Or something deeper? I'm curious to know.

Cheers,

   -- Alan

[Chad Dombrova]

Hi Alan,

The point of the message attribute is to make connections between nodes that are purely symbolic. Data does not flow through message attributes -- in either direction -- so there is no chance of a connection made with a message attribute causing errors with Maya's DG evaluation.  These connections are useful to custom processes which need to know the relationships between nodes. 

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[Eduardo Grana]

Hey Alan,

You can see an example of the use of message attribute with the image plane.

If you create one, you'll see the connection to the camera shape through that attribute...

Cheers!

Eduardo

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Eduardo Graña
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[Alan Fregtman]

Cool! Thank you for clarifying, guys.

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