Area :: Discussions

Feedback

Tell us what you think of the site.

Send Feedback

AREA
Digital Entertainment
& Visualization Community

Autodesk Media & Entertainment User Community

Latest Blogs

Maxed Out
Guess the picture, get the video: Number 2

My Oh Maya!
Making Art with Python

The Smoke Learning Blog
Autodesk Smoke: Extending Clip History in the Timeline

More Blogs

Software Trials

Autodesk® 3ds Max®

Download Trial

Autodesk® Maya®

Download Trial

Autodesk® Softimage®

Download Trial

Autodesk® MotionBuilder®

Download Trial

Autodesk® Mudbox™

Download Trial

Autodesk® Sketchbook® Pro

Download Trial

Autodesk® Smoke on Mac®

Download Trial

Quick Links

Smoke Community Portal

Fake or Foto

Autodesk Masters

Professional Instructor Community

Creative Finishing Tutorials

My First Flame

Autodesk Maya Bonus Tools

Game Developer Zone

Autodesk Sketchbook Pro

RSS 2.0

ATOM

How to read MotionBuilder Groups with FBX SDK

Rate this thread

Permlink of this thread Subscribe to this thread

nazcaspider

nazcaspider
Posted: 07 October 2009 10:36 PM

Total Posts: 7
Joined: 17 July 2008 01:19 PM

Hello,

I need to be able to read the groups defined in MotionBuilder from a .fbx file (see attached screenshot). I cannot find that information in the FBX SDK documentation.

I tried looping trough all the member in the scene like:

for(int i = 0; i < pFbxScene->GetMemberCount() i++)

{

  KFbxObject* member = pFbxScene->GetMember(i)

  if(namedLike("xxx", member))

  { //its a group

  }

}

and it looks like the groups nodes are defined as KFbxTakeNodeContainer but I cannot find ways to recursively access its children.

Any idea how to solve this?

Cheers

Replies: 0

Zhihao.Li

Zhihao.Li
Posted: 11 October 2009 10:11 PM

Total Posts: 90
Joined: 04 September 2008 06:59 AM
Permlink of this post

Hi nazcaspider,
Sorry, currently, FBX SDK doesn’t support the group of Motion builder:(
Thank you for your info, and we’ll follow up the issue.

Zhihao, Data Platform - Autodesk

Replies: 0

Jiayang Xu

Jiayang Xu
Posted: 12 October 2009 07:58 PM

Location: Shanghai, PRC.
Total Posts: 338
Joined: 12 November 2008 08:59 AM
Permlink of this post

Hi nazcaspider, if you are using FBX SDK 2010.2, then there is a workaround for you.
Since 2010.2, we introduced the concept of “Selection Set”, which is equivalent to “Group” in MotionBuilder.
So basically, if you can make sure the KFbxObject is a “Group”, then you can cast it and call KFbxSelectionSet::GetSelectionNodesAndDirectObjects to get the members of this group.
Something like this:

for(int i = 0; i < pFbxScene->GetMemberCount() i++)

{

    KFbxObject* member = pFbxScene->GetMember(i)

    if(namedLike("xxx", member))

    { //its a group

        KArrayTemplate<KFbxSelectionNode*> lSelectionNodeList;

        KArrayTemplate<KFbxObject*> lDirectObjectList;

        ((KFbxSelectionSet* )lObject)->GetSelectionNodesAndDirectObjects(lSelectionNodeList, lDirectObjectList)

        int lCount = lDirectObjectList.GetCount()

        for(int j = 0; j < lCount; j++)

        {

            KFbxObject* lChildObject = lDirectObjectList[j];

        }

    }

}

“Group” in MotionBuilder is only object-level, so you only need to take care of lDirectObjectList.
You do not need to consider lSelectionNodeList, which is only useful when there are component-level (vertex, edge of face) selection.

Jiayang Xu
Maya Data Platform
Autodesk

Replies: 1

Great that’s exactly what I need.

I found a way to discover if a KFbxObject is a Group by using the runtime type name; if so I then cast to KFbxSelectionSet as you explained:

void ProcessGroups(const KFbxScene* pScene)

{

  for(int i = 0; i < pScene->GetMemberCount() i++)

  {

    KFbxObject* pMember =  pScene->GetMember(i)

    if(IsGroup(pMember))

    {

      KArrayTemplate<KFbxSelectionNode*> selectionNodeList;

      KArrayTemplate<KFbxObject*> directObjectList;

      ((KFbxSelectionSet* )pMember)->GetSelectionNodesAndDirectObjects(selectionNodeList, directObjectList)

      ProcessChildren(directObjectList)

    }

  }

}

bool IsGroup(const KFbxObject* pObject)

{

  kFbxClassId runClassId = pObject->GetRuntimeClassId()

  const char* runClassName = runClassId.GetName()

  if(!strcmp(runClassName, "GroupSelection_Default"))

    return true;

  return false;
}

Thanks a lot

Author: nazcaspider

Replied: 13 October 2009 02:27 AM

Settings

Choose Theme color: