Hi,
I looked through a lot of documentation on the OSG and did not find how to use
correctly "draw instancing" in the OSG. I want to load the model tree in a
format tree.3ds or tree.osg and draw more than 10,000 copies.
Please tell my classes for what I need to pay attention to the OSG to use "draw
instancing" and draw a lot of trees.
I tried to write this code:
Code:
static osg::Node *treeNode = NULL;
treeNode = osgDB::readNodeFile("../../tree.3ds");
osg::Group *root = new osg::Group();
int k=100; // 10 000
for (int i=0, x=0; i<k; ++i, x+=40)
for (int i=0, y=0; i<k; ++i, y+=40)
{
osg::MatrixTransform *tm = new osg::MatrixTransform;
tm->setMatrix(osg::Matrix::translate(osg::Vec3f(x, y, 0)));
tm->addChild(treeNode);
root->addChild(tm);
}
osgViewer::Viewer viewer;
viewer.setSceneData(root);
viewer.setCameraManipulator(new osgGA::TrackballManipulator);
viewer.realize();
printf("\nroot_num_childrens=%i\n", root->getNumChildren());
while(!viewer.done())
{
viewer.frame();
}
But this method is very bad. Because it is slow and takes a lot of memory.
Thank you!
Cheers,
Oleg
------------------
Read this topic online here:
http://forum.openscenegraph.org/viewtopic.php?p=27160#27160
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