Hi NiuHeming,
Most likely problem is that your geometry has display lists enabled
and it hasn't been told that its now out of date so isn't updated.
If you are dynamically updating a geometry then its best to turn of
display lists via geometry->setUseDisplayLists(false); Or if you
update very occassionally then on after each batch of changes you need
a geometry->dirtyDisplayList();
Robert.
2008/3/19 Niuheming <[EMAIL PROTECTED]>:
>
>
> Hi,
> I want to write a class from osg::Drawable::UpdateCallback to update a
> Geometry call named geom,but there is no update happen.I dot't know what's
> wrong.Does someone knows?
> Thanks in advance!
> NiuHeming
>
> class niuhm : public osg::Drawable::UpdateCallback
> {
> public:
> niuhm(const osg::Vec3& v11,const osg::Vec3& v22,const osg::Vec3&
> v33)
> {
> v1=v11;
> v2=v22;
> v2=v33;
>
> bs.radius()*=1.5f;
> bs=osg::BoundingSphere(osg::Vec3(0.0f,0.0f,0.0f),4.0f);
> bb.expandBy(bs);
> }
>
>   ; virtual void update(osg::NodeVisitor* nv, osg::Drawable* node)
> {
> osg::Geometry* geom = dynamic_cast<osg::Geometry*>(node);
> const osg::FrameStamp* frameStamp = nv->getFrameStamp();
> if (geom && frameStamp)
> {
> osg::PositionAttitudeTransform* mt = new
> osg::PositionAttitudeTransform();
> {
> // set up the animation path
> osg::AnimationPath* animationPath = new
> osg::AnimationPath;
>
> animationPath->insert(0.0,osg::AnimationPath::ControlPoint(bb.corner(0)));
> animationPath->inse
> rt(1.0,osg::AnimationPath::ControlPoint(bb.corner(1)));
>
> animationPath->insert(2.0,osg::AnimationPath::ControlPoint(bb.corner(2)));
>
> animationPath->insert(3.0,osg::AnimationPath::ControlPoint(bb.corner(3)));
>
> animationPath->insert(4.0,osg::AnimationPath::ControlPoint(bb.corner(0)));
>
> animationPath->setLoopMode(osg::AnimationPath::SWING);
> &nbs p; mt->setUpdateCallback(new
> osg::AnimationPathCallback(animationPath));
> }
>
> // create marker for point light.
> osg::Vec3 vertices = mt->getPosition();
>
> unsigned int noXSteps = 100;
> unsigned int noYSteps = 100;
>
> osg::Vec3Array* coords = new osg::Vec3Array;
> coords->reserve(noXSteps*noYSteps);
>
>
> osg::Vec3 dx = (v2-v1)/((float)noXSteps-1.0f);
> &nbs p; osg::Vec3 dy = (v3-v1)/((float)noYSteps-1.0f);
> unsigned int rowvertices;
> unsigned int colvertices;
> rowvertices=(unsigned
> int)((vertices._v[0])/(dx._v[0]));
> colvertices=(unsigned
> int)((vertices._v[1])/(dy._v[1]));
>
> unsigned int row;
> & nbsp; osg::Vec3 vRowStart = v1;
> for(row=0;row<noYSteps;++row){
> osg::Vec3 v = vRowStart;
> for(unsigned int col=0;col<noXSteps;++col){
> if ((row==rowvertices)&&(col==colvertices))
>
> coords->push_back(v+osg::Vec3(0.0f,0.0f,-1.0f));
> else
> coords->push_back(v);
> v += dx;
> }
> vRowStart+=dy;
> }
>
> geom->setVertexArray(coords);
> }
>
> }
> osg::Vec3 v1;
> osg::Vec3 v2;
> osg::Vec3 v3;
> osg::BoundingSphere bs;
> osg::BoundingBox bb;
> };
>
> ________________________________
> "七件武器，七种完美" 立刻体验！
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>
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