OSG动画学习

转自：http://bbs.osgchina.org/forum.php?mod=viewthread&tid=3899&_dsign=2587a6a9

学习动画,看了osganimationskinning这个例子,感觉OSG的动画实现的太灵活了.
一个简单的模型节点变换动画过程如下:

1.定义一些变换位置
2.定义动画关键帧,包含了时间,位置,旋转等数据
这里可以设置受变化作用的节点
3.给节点设置一个动画管理器,这个动画管理器是继承自Osg::NodeCallback,所以其实是个Callback类.
4.把定义的关键帧的数据,送给动画管理器
5.创建一个等待变化的节点
6.把变化节点的顶点数据与给出的变换位置进行映射,此时定义的是这些节点中每个顶点的变化方式
7.开始动画

好的东西写不出来,只把这个程序的一些理解记录一下.
这个例子来自OSG的代码中的Example->osganimationskinning

 /*  -*-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.

 */

 #include <iostream>

 #include <osg/Geometry>

 #include <osg/MatrixTransform>

 #include <osg/Geode>

 #include <osgViewer/Viewer>

 #include <osgGA/TrackballManipulator>

 #include <osgUtil/SmoothingVisitor>

 #include <osg/io_utils>

 #include <osgAnimation/Bone>

 #include <osgAnimation/Skeleton>

 #include <osgAnimation/RigGeometry>

 #include <osgAnimation/Skinning>

 #include <osgAnimation/BasicAnimationManager>

 // 创建的是些辅助的线条,跟随节点的运动

 osg::Geode* createAxis()

 {

     osg::Geode* geode (new osg::Geode());

     osg::Geometry* geometry (new osg::Geometry());

     osg::Vec3Array* vertices (new osg::Vec3Array());

     vertices->push_back (osg::Vec3 ( 0.0, 0.0, 0.0));

     vertices->push_back (osg::Vec3 ( 1.0, 0.0, 0.0));

     vertices->push_back (osg::Vec3 ( 0.0, 0.0, 0.0));

     vertices->push_back (osg::Vec3 ( 0.0, 1.0, 0.0));

     vertices->push_back (osg::Vec3 ( 0.0, 0.0, 0.0));

     vertices->push_back (osg::Vec3 ( 0.0, 0.0, 1.0));

     geometry->setVertexArray (vertices);

     osg::Vec4Array* colors (new osg::Vec4Array());

     colors->push_back (osg::Vec4 (1.0f, 0.0f, 0.0f, 1.0f));

     colors->push_back (osg::Vec4 (1.0f, 0.0f, 0.0f, 1.0f));

     colors->push_back (osg::Vec4 (0.0f, 1.0f, 0.0f, 1.0f));

     colors->push_back (osg::Vec4 (0.0f, 1.0f, 0.0f, 1.0f));

     colors->push_back (osg::Vec4 (0.0f, 0.0f, 1.0f, 1.0f));

     colors->push_back (osg::Vec4 (0.0f, 0.0f, 1.0f, 1.0f));

     geometry->setColorArray (colors);

     geometry->setColorBinding (osg::Geometry::BIND_PER_VERTEX);

     geometry->addPrimitiveSet(new osg:rawArrays(osg:rimitiveSet:INES,,));

     geode->addDrawable( geometry );

     return geode;

 }

 // 创建了一个等待变换的BOX

 osgAnimation::RigGeometry* createTesselatedBox(int nsplit, float size)

 {

     osgAnimation::RigGeometry* geometry = new osgAnimation::RigGeometry;

     osg::ref_ptr<osg::Vec3Array> vertices (new osg::Vec3Array());

     osg::ref_ptr<osg::Vec3Array> colors (new osg::Vec3Array());

     geometry->setVertexArray (vertices.get());

     geometry->setColorArray (colors.get());

     geometry->setColorBinding (osg::Geometry::BIND_PER_VERTEX);    

     float step = size / nsplit;

     float s = 0.5/4.0;

     for (int i = ; i < nsplit; i++)

     {

         float x = - + i * step;

         std::cout << x << std::endl;

         vertices->push_back (osg::Vec3 ( x, s, s));

         vertices->push_back (osg::Vec3 ( x, -s, s));

         vertices->push_back (osg::Vec3 ( x, -s, -s));

         vertices->push_back (osg::Vec3 ( x, s, -s));

         osg::Vec3 c (,,);

         c[i%] = ;

         colors->push_back (c);

         colors->push_back (c);

         colors->push_back (c);

         colors->push_back (c);

     }

     osg::ref_ptr<osg::UIntArray> array = new osg::UIntArray;

     for (int i = ; i < nsplit - ; i++)

     {

         int base = i * ;

         array->push_back(base);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

         array->push_back(base+);

     }

     geometry->addPrimitiveSet(new osg:rawElementsUInt(osg:rimitiveSet::TRIANGLES, array->size(), &array->front()));

     geometry->setUseDisplayList( false );

     return geometry;

 }

 // 把变化节点的顶点数据与给出的变换位置进行映射,此时定义的是这些节点中每个顶点的变化方式

 void initVertexMap(osgAnimation::Bone* b0,

                    osgAnimation::Bone* b1,

                    osgAnimation::Bone* b2,

                    osgAnimation::RigGeometry* geom,

                    osg::Vec3Array* array)

 {

     osgAnimation::VertexInfluenceSet vertexesInfluences;

     osgAnimation::VertexInfluenceMap* vim = new osgAnimation::VertexInfluenceMap;

     (*vim)[b0->getName()].setName(b0->getName());

     (*vim)[b1->getName()].setName(b1->getName());

     (*vim)[b2->getName()].setName(b2->getName());

     for (int i = ; i < (int)array->size(); i++)

     {

         float val = (*array)[];

         std::cout << val << std::endl;

         // 把每个顶点的变换分配给变换节点

         if (val >= - && val <= )

             (*vim)[b0->getName()].push_back(osgAnimation::VertexIndexWeight(i,));

         else if ( val >  && val <= )

             (*vim)[b1->getName()].push_back(osgAnimation::VertexIndexWeight(i,));

         else if ( val > )

             (*vim)[b2->getName()].push_back(osgAnimation::VertexIndexWeight(i,));

     }

     geom->setInfluenceMap(vim);

 }

 int main (int argc, char* argv[])

 {

     osg::ArgumentParser arguments(&argc, argv);

     osgViewer::Viewer viewer(arguments);

     viewer.setCameraManipulator(new osgGA::TrackballManipulator());

     osg::ref_ptr<osgAnimation::Skeleton> skelroot = new osgAnimation::Skeleton;

     skelroot->setDefaultUpdateCallback();

     // 定义一些变换位置,这些位置会在关键帧的设置用到

     osg::ref_ptr<osgAnimation::Bone> root = new osgAnimation::Bone;

     {

         root->setBindMatrixInBoneSpace(osg::Matrix::identity());

         root->setBindMatrixInBoneSpace(osg::Matrix::translate(-,,));

         root->setName("root");

         root->setDefaultUpdateCallback();

     }

     osg::ref_ptr<osgAnimation::Bone> right0 = new osgAnimation::Bone;

     right0->setBindMatrixInBoneSpace(osg::Matrix::translate(,,));

     right0->setName("right0");

     right0->setDefaultUpdateCallback("right0");

     osg::ref_ptr<osgAnimation::Bone> right1 = new osgAnimation::Bone;

     right1->setBindMatrixInBoneSpace(osg::Matrix::translate(,,));

     right1->setName("right1");

     right1->setDefaultUpdateCallback("right1");

     // 定义变换点之间的父子关系,也就是相对变换的关系

     root->addChild(right0.get());

     right0->addChild(right1.get());

     skelroot->addChild(root.get());

     osg::Group* scene = new osg::Group;

     osg::ref_ptr<osgAnimation::BasicAnimationManager> manager = new osgAnimation::BasicAnimationManager;

     scene->setUpdateCallback(manager.get());

 // 关键帧的定义,时间和位置,现在给的是旋转运动方式,更多的变换方式,可以看一下osgAnimation中的数据结构定义

     // 定义right0的关键帧,时间和旋转

     osgAnimation::Animation* anim = new osgAnimation::Animation;

     {

         osgAnimation:uatKeyframeContainer* keys0 = new osgAnimation:uatKeyframeContainer;

         osg:uat rotate;

         rotate.makeRotate(osg:I_2, osg::Vec3(,,));

         // osgAnimation:uatKeyframe(0,osg:uat(0,0,0,1))中第一个参数是时间点,单位是秒,第二个参数就是这个时间点,要旋转到的位置,本例中是旋转,也可以换成其它变换方式

         keys0->push_back(osgAnimation:uatKeyframe(,osg:uat(,,,)));

         keys0->push_back(osgAnimation:uatKeyframe(,rotate));

         keys0->push_back(osgAnimation:uatKeyframe(,rotate));

         osgAnimation:uatSphericalLinearSampler* sampler = new osgAnimation:uatSphericalLinearSampler;

         sampler->setKeyframeContainer(keys0);

         // osgAnimation::AnimationUpdateCallback* cb = dynamic_cast<osgAnimation::AnimationUpdateCallback*>(right0->getUpdateCallback());

         osgAnimation:uatSphericalLinearChannel* channel = new osgAnimation:uatSphericalLinearChannel(sampler);

         channel->setName("quaternion");

         channel->setTargetName("right0");

         anim->addChannel(channel);

     }

     // 定义right1的关键帧

     {

         osgAnimation:uatKeyframeContainer* keys1 = new osgAnimation:uatKeyframeContainer;

         osg:uat rotate;

         rotate.makeRotate(osg:I_2, osg::Vec3(,,));

         keys1->push_back(osgAnimation:uatKeyframe(,osg:uat(,,,)));

         keys1->push_back(osgAnimation:uatKeyframe(,osg:uat(,,,)));

         keys1->push_back(osgAnimation:uatKeyframe(,rotate));

         osgAnimation:uatSphericalLinearSampler* sampler = new osgAnimation:uatSphericalLinearSampler;

         sampler->setKeyframeContainer(keys1);

         osgAnimation:uatSphericalLinearChannel* channel = new osgAnimation:uatSphericalLinearChannel(sampler);

         //osgAnimation::AnimationUpdateCallback* cb = dynamic_cast<osgAnimation::AnimationUpdateCallback*>(right1->getUpdateCallback());

         channel->setName("quaternion");

         channel->setTargetName("right1");

         anim->addChannel(channel);

     }

     // 把时间和位置告诉动画管理器

     manager->registerAnimation(anim);

     manager->buildTargetReference();

     // let's start !   开始动画

     manager->playAnimation(anim);

     // we will use local data from the skeleton

     osg::MatrixTransform* rootTransform = new osg::MatrixTransform;

     rootTransform->setMatrix(osg::Matrix::rotate(osg:I_2,osg::Vec3(,,)));

     // 把创建的线条指示放到变换节点中,主要是一个指示作用

     right0->addChild(createAxis());

     // 使节点数据更新完毕后,再进行渲染动作

     right0->setDataVariance(osg::Object:YNAMIC);

     right1->addChild(createAxis());

     right1->setDataVariance(osg::Object:YNAMIC);

     //

     osg::MatrixTransform* trueroot = new osg::MatrixTransform;

     trueroot->setMatrix(osg::Matrix(root->getMatrixInBoneSpace().ptr()));

     trueroot->addChild(createAxis());

     trueroot->addChild(skelroot.get());

     trueroot->setDataVariance(osg::Object:YNAMIC);

     // trueroot也是节点,需要加到场景中去,现在是把它设置为rootTransform的一个子节点

     rootTransform->addChild(trueroot);

     scene->addChild(rootTransform);

     // 现在创建等待变换的盒子

     osgAnimation::RigGeometry* geom = createTesselatedBox(, 4.0);

     osg::Geode* geode = new osg::Geode;

     geode->addDrawable(geom);

     skelroot->addChild(geode);

     osg::ref_ptr<osg::Vec3Array> src = dynamic_cast<osg::Vec3Array*>(geom->getVertexArray());

     geom->getOrCreateStateSet()->setMode(GL_LIGHTING, false);

     geom->setDataVariance(osg::Object:YNAMIC);

     // 给盒子的每个顶点设置变换方式

     initVertexMap(root.get(), right0.get(), right1.get(), geom, src.get());

     // let's run !

     viewer.setSceneData( scene );

     viewer.realize();

     // 开始运行了

     while (!viewer.done())

     {

         viewer.frame();

     }

     return ;

 }

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