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

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Hi Javier and maya2osg users,

It has been a long time since I worked on maya2osg exporter. Users I'm working with reported me some

problems on the exporter, so I made some fixes to solve them. I'll be glad if these fixes could be commited

to the trunk.

You will find attached to this email the first bug fix I did 7 or 8 months ago. It seems that it has never been

commited, so I submit it again. These are some bug fixes about cube maps exports. The fixes are :

 - The filter type was not read in the correct node.

 - I set the default texture filter for the cubeMap to LINEAR_MIPMAP_LINEAR.

   If at least one face of the cubemap has a texture filter set to None, I set the texture filter of the whole cubemap

   to NEAREST.

 - Enabling HardwareMipMapGeneration with texture filtering does not seem to work, so I enabled it only

   when filtering is set to NEAREST.

 - Cubemap was not visible when exporting the maya model in a binary file with embedded textures, due to

   relative file path.

I attached to this mail some icons I made for the  new "create switch" buttons.

Tell me if there is any problem with this submission, I will fix it if there is.

Best 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 : BOYREL David <dav...@ok...>
Envoyé : mercredi 4 mars 2015 15:43
À : Javier Taibo
Cc : may...@li...
Objet : Re: [Maya2osg-users] Add osg::Switch support to Maya2Osg

Hi Javier,

Thank you for commiting the osg::Switch support to maya2osg. You'll find attached to this mail some icons I made for the  new shelf

buttons. I hope they are fine for you ;)

You will find too the fix I did for the cubemap. I found several problems :

 - The filter type was not read in the correct node.

 - I set the default texture filter for the cubeMap to LINEAR_MIPMAP_LINEAR.

   If at least one face of the cubemap has a texture filter set to None, I set the texture filter of the whole cubemap

   to NEAREST.

 - Enabling HardwareMipMapGeneration with texture filtering does not seem to work, so I enabled it only

   when filtering is set to NEAREST.

 - Cubemap was not visible when exporting the maya model in a binary file with embedded textures, due to

   relative file path.

I'm currently trying to find a way to export the information about using vertices colors as material infos (by setting

the material color mode to something other than OFF). I thought about using the "Display Colors" and "Display Color Channel"

information set in the "Mesh Component Display" toolbox. If you have ever thought about exporting those kind of informations

or if you have any ideas about it, I'll be glad to hear your suggestions.

Best 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 13 février 2015 20:46
À : may...@li...
Objet : Re: [Maya2osg-users] Add osg::Switch support to Maya2Osg

  Hi David,

  Sorry for the delay. I have reviewed your code and changed a few things. The check for the dynamic attribute "isSwitch" has been simplified, and an additional check for the presence of the switch is added before adding it as a child of the transform node.

  Also, I added a pair of buttons to the shelf, so you can easily select any transform in your scene and convert it to a switch or undo it. No icons for this buttons (default icon), if anybody wants to contribute with some art to the project, is welcome :)

  These changes are commited to trunk (r266).

  It would be nice to add also the switch configuration to Maya node, but it is not trivial to keep it up-to-date with Maya scene graph (maybe connecting the switch values with the visibility attribute of the children). We'll let it for a future release :)

  If you send me the code with the corrections to the cubeMap, I'll take a look as soon as I have time.

  Regards,

On Wed, Feb 4, 2015 at 1:50 PM, BOYREL David <dav...@ok...<mailto:dav...@ok...>> wrote:

Hi Javier,

Sorry for being so long to answer your mail.

You will find attached to this email a submission for the osg::Switch support to maya2osg.

The modification I made is the one we discussed : if a custom attribute named "isSwitch" is

found on a maya transform node,  the maya node is exported with an osg::MatrixTransform

with an osg::Switch as a child, to keep to transformation data. The name of the attribute is case

insensitive.

The modification was made only on the group.cpp file. The revision I used is the head one (r265

from trunk).

Tell me if this modification is good for you.

I also found a problem in the setting of texture filter type of cubeMap textures. It seems that the

test of the "filterType" plug is done on the wrong node. It needs to be tested a bit more. I'll send

you a submission when I cleaned my code.

Best 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

________________________________
De : Javier Taibo <jav...@gm...<mailto:jav...@gm...>>
Envoyé : mardi 18 novembre 2014 22:01

À : may...@li...<mailto:may...@li...>
Objet : Re: [Maya2osg-users] Add osg::Switch support to Maya2Osg

  Hi David,

  Create custom Maya nodes is a bit overkill for what you want, if I am understanding it correctly what you are trying to do.

  I suppose all you need to do is check for the "script" attribute(s) and create a osg::Switch when present or an osg::Transform otherwise. It seems a light modification to the exporter, and should not break anything, so I would be happy to add it to the trunk. Send me the modified file(s) and I will review and commit them. Just follow the OSG submission rules (whole files, not patches). Thank you!

  Regards,

On Tue, Nov 18, 2014 at 10:05 AM, BOYREL David <dav...@ok...<mailto:dav...@ok...>> wrote:

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<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

________________________________
De : Javier Taibo <jav...@gm...<mailto:jav...@gm...>>
Envoyé : vendredi 14 novembre 2014 20:43
À : may...@li...<mailto: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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