Re: [Maya2osg-users] Add osg::Switch support to Maya2Osg

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Hi Javier,

Thank you very much for your quick answer.

Your suggestion is wise. I'm not experienced enough with maya to be sure the solution I choose is the right one. But I saw that introducing new kind of nodes in Maya will indeed results in errors when loading the Maya scene in absence of maya2osg.

Using custom attributes seems good to me.

Do you think that I could submit to maya2osg the support of osg::Switch using custom attributes?

Because I need anyway to perform some custom operations on the generated OSG scene graph, so I could manage osg::Switch at that time, based on the OSG nodes description, and leave the maya2osg exporter as it is.

Tell me if osg::Switch support may interest some other users of maya2osg.

Thank you again for your answer.

Regards,

--
David BOYREL
OKTAL Paris
19 Bd des Nations Unies - 92190 Meudon (France)
Tél. : +33 (0)1 46 94 93 52
Fax : +33 (0)1 41 41 91 44
http://www.oktal.fr

________________________________
De : Javier Taibo <jav...@gm...>
Envoyé : vendredi 14 novembre 2014 20:43
À : may...@li...
Objet : Re: [Maya2osg-users] Add osg::Switch support to Maya2Osg

  Hi David,

  IMHO the best way to do what you want is by far the third one. It is quite easy to add an extra attribute to a Maya transform node and later check in the exporter whether the transform is marked as a switch and create a Switch or a Transform depending on the case.

  From mel you can do it with something like that:

  addAttr -ln "isSwitch"  -at bool  | pSphere1;

  Regards,

On Fri, Nov 14, 2014 at 4:53 PM, BOYREL David <dav...@ok...<mailto:dav...@ok...>> wrote:

Hello people,

My name is David Boyrel from Oktal company. We develop a driving simulation software (SCANeR Studio),

which visual application is based on OSG. You can find some (old) images on the OSG website :

http://www.openscenegraph.org/index.php/gallery?AG_MK=0&AG_form_paginInitPages_1=1&AG_form_albumInitFolders_1=Screenshots/SCANeRII&AG_form_scrollTop=456&AG_form_scrollLeft=0&AG_MK=0

I am currently testing maya2osg  in order to provide to some of our customers a way to export their database and vehicle

production from Maya to our simulation software. For now, they use the OpenFlight exporter. Maya2osg seems to be more

flexible.

In order to add some logical informations into the scene graph, I'm currently searching a way to add osg::Switch support to maya2osg.

Since I'm not very familiar with both Maya modeler and Maya API, I thought about 3 ways to do this. But I'm not sure if these

methods are correct. Here are my thoughts :

1. Adding to the plugin a new custom DAG node, and to the exporter shelf a command to create this kind of node, as a child

 of the currently selected node.

 I managed to do this by creating a custom node that inherits MPxTransform. This node will become an osg::Switch

 when exported by maya2osg.

 However, I understood DAG nodes are only Transforms or Shapes. So my new DAG node does not seem to fit the Maya approach.

 And I would have to convert this node to an osg::Switch above an osg::MatrixTransform.

2. Adding to the plugin a new custom node (not a DAG node), and to the exporter shelf a command to create this kind of node.

 This new type of node will have an output attribute (maybe a table, I don't know if its possible), that could be plugged to a

 DAG node "visibility" attribute.

 So this new node will not be a DAG node, and so will not have any parent or children.

 I feel this is more the "Maya way" to give to maya users the ability to create switches.

3. Just adding a custom attribute to maya nodes.

 I saw the maya2osg exporter writes custom attributes to the OSG nodes description.

 I could then use a traverser to find the nodes having the switch attribute description, and then

 modify the scene graph to insert a Switch above the node.

 But adding a custom attribute in Maya does not seem to be very intuitive.

I do not know Maya and its API very well, so maybe I'm totally wrong.

So if you could please tell me what you think about this, or how would you do this, I would be grateful.

My hope is to submit this development to maya2osg. That's why I tell you about this.

Regards,

--
David BOYREL
OKTAL Paris
19 Bd des Nations Unies - 92190 Meudon (France)
Tél. : +33 (0)1 46 94 93 52<tel:%2B33%20%280%291%2046%2094%2093%2052>
Fax : +33 (0)1 41 41 91 44<tel:%2B33%20%280%291%2041%2041%2091%2044>
http://www.oktal.fr

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--
Javier Taibo