Difference between loading FBX files with and without animation

[luohuiiqng]

Hello!
I now have an FBX model file, and when I export the model from blender without drawing, the node textures that are loaded out appear fine, and when I export the part with animation, it does appear as a white model or nothing at all. How can I fix it? Thank you!

The exported model worked fine when I used windows' built-in 3d viewer, whether animation was included or not.

model.zip

/*  -*-c++-*-
 *  Copyright (C) 2008 Cedric Pinson <mornifle@plopbyte.net>
 *
 * This library is open source and may be redistributed and/or modified under
 * the terms of the OpenSceneGraph Public License (OSGPL) version 0.0 or
 * (at your option) any later version.  The full license is in LICENSE file
 * included with this distribution, and on the openscenegraph.org website.
 *
 * This library is distributed in the hope that it will be useful,
 * but WITHOUT ANY WARRANTY; without even the implied warranty of
 * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE.  See the
 * OpenSceneGraph Public License for more details.
 *
 * Authors:
 * Cedric Pinson <mornifle@plopbyte.net>
 * jeremy Moles <jeremy@emperorlinux.com>
*/

#include "AnimtkViewerKeyHandler"
#include "AnimtkViewerGUI"

#include <iostream>
#include <osg/io_utils>
#include <osg/Geometry>
#include <osg/MatrixTransform>
#include <osg/Geode>
#include <osgDB/FileNameUtils>
#include <osgViewer/Viewer>
#include <osgViewer/ViewerEventHandlers>
#include <osgWidget/ViewerEventHandlers>
#include <osgGA/TrackballManipulator>
#include <osgGA/StateSetManipulator>
#include <osgDB/ReadFile>
#include <osgAnimation/AnimationManagerBase>
#include <osgAnimation/Bone>

const int WIDTH  = 1440;
const int HEIGHT = 900;



struct AnimationManagerFinder : public osg::NodeVisitor
{
    osg::ref_ptr<osgAnimation::BasicAnimationManager> _am;
    AnimationManagerFinder() : osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}
    void apply(osg::Node& node) {
        if (_am.valid())
            return;
        if (node.getUpdateCallback()) {
            osgAnimation::AnimationManagerBase* b = dynamic_cast<osgAnimation::AnimationManagerBase*>(node.getUpdateCallback());
            if (b) {
                _am = new osgAnimation::BasicAnimationManager(*b);
                return;
            }
        }
        traverse(node);
    }
};


struct AddHelperBone : public osg::NodeVisitor
{
    AddHelperBone() : osg::NodeVisitor(osg::NodeVisitor::TRAVERSE_ALL_CHILDREN) {}
    void apply(osg::Transform& node) {
        osgAnimation::Bone* bone = dynamic_cast<osgAnimation::Bone*>(&node);
        if (bone)
            bone->addChild(createAxis());
        traverse(node);
    }
};

int main(int argc, char** argv)
{
    

    osgViewer::Viewer viewer;
    osg::ref_ptr<osg::Group> group = new osg::Group();   
    osg::ref_ptr<osg::Node> loadedmodel = osgDB::readNodeFile("E:/Resources/model/001/Wolf-Blender-2.82a.fbx");
    osg::Group* node = dynamic_cast<osg::Group*>(loadedmodel.get());
    if(!node)
    {       
        return 1;
    }

    // Set our Singleton's model.
    AnimationManagerFinder finder;
    node->accept(finder);
    if (finder._am.valid())
    {

        osgAnimation::Animation::PlayMode playMode = osgAnimation::Animation::LOOP;
        for (osgAnimation::AnimationList::const_iterator animIter = finder._am->getAnimationList().begin();
                animIter != finder._am->getAnimationList().end(); ++animIter)
        {
            (*animIter)->setPlayMode(playMode);
        }

        node->setUpdateCallback(finder._am.get());
        AnimtkViewerModelController::setModel(finder._am.get());
    }
    else
    {
        osg::notify(osg::WARN) << "no osgAnimation::AnimationManagerBase found in the subgraph, no animations available" << std::endl;
    }
       

    group->addChild(node);    
    viewer.setSceneData(group.get());

    viewer.setUpViewInWindow(40, 40, WIDTH, HEIGHT);

    return viewer.run();
}

[robertosfield]

I didn't write the OSG's fbx plugin or osgAnimation so can't help on the specific of them.

You may find it's just easier to use the VulkanSceneGraph - today I checked in animation support that is easier to use, performs better and has support for PBR and cascaded shadow maps out of the box than what the OSG provides.

I have written up details on the VSG forum:
vsg-dev/VulkanSceneGraph#1095