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->insert(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);
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);
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; 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;
};
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