question

Alan Jones asked · Oct 08 at 09:22 PM

Control Maya modifying camera attributes on camera type selection

Hi all,

So I've implemented a custom Arnold camera node, created a CExtension which registers an mtoa translator and it all successfully goes through.

However, this type of camera is more akin to an othographic camera than a perspective one, but every time the camera type is chosen in the Arnold section of the camera, it disables the orthographic setting.

Is there some one I can hook myself in to these callbacks so that I can control what is set and adjusted when my camera type is selected? (If so, how? :P)

Cheers,

Alan.

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Alan Jones · Oct 09 at 08:02 PM

Uh oh - guessing the answer may be no? Either that or it's very ugly.

Seems there is a MNodeMessage which has a parameter changed callback, but that requires a specific node for it to be registered for.

There's a MDGMessage that I could use to detect when a node is added, check if it's a camera node, then register the aforementioned MNodeMessage for it's parameter changes.

However, that may or may not trigger when a scene is opened (unclear from docs whether an existing node in a scene being loaded would count as an add - to be continued)

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Alan Jones Alan Jones · Oct 09 at 08:20 PM

Also unclear whether callbacks are persisted, not in docs either. If both of those are false, then there's an MSceneMessage which has an opened callback that I could use to go and run through the entire scene, find all cameras and register the MNodeMessage callback mentioned at the start.

However, if there are other callbacks coming into play then those could change the values before I get them if it executes first. Or they may also execute afterwards and overwrite my changes. Or infinite loop.

Anyone at Autodesk able to confirm/deny any of this? (or provide a solution that would work)

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Stephen Blair ♦ Alan Jones · Oct 09 at 11:01 PM

Hi @Alan Jones

I'll ask the MtoA devs to take a look at these questions...

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