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

[Javier T. <jav...@gm...>]

  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...> 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
> Fax : +33 (0)1 41 41 91 44
> http://www.oktal.fr
>
>
>
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-- 
Javier Taibo