FGFS-4.1/OpenSceneGraph
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To osgclipe example added --text textstring and --simple command line options to test mixing text and clipping

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This commit is contained in:
Robert Osfield 2018-03-30 15:16:45 +01:00
parent f54403284f
commit 88e8b1ede0
2 changed files with 79 additions and 26 deletions
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5
examples/osgclip/CMakeLists.txt
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@ -1,6 +1,7 @@
#this file is automatically generated
#this file is automatically generated
SET(TARGET_SRC osgclip.cpp )
SET(TARGET_ADDED_LIBRARIES osgText )
#### end var setup ###
SETUP_EXAMPLE(osgclip)

100
examples/osgclip/osgclip.cpp
View File

@ -38,6 +38,7 @@
#include <osgViewer/Viewer>
#include <osgUtil/Optimizer>
#include <osgText/Text>
osg::ref_ptr<osg::Node> decorate_with_clip_node(const osg::ref_ptr<osg::Node>& subgraph)
@ -57,25 +58,6 @@ osg::ref_ptr<osg::Node> decorate_with_clip_node(const osg::ref_ptr<osg::Node>& s
wireframe_subgraph->addChild(subgraph);
rootnode->addChild(wireframe_subgraph);
/*
// simple approach to adding a clipnode above a subgraph.
// create clipped part.
osg::ClipNode* clipped_subgraph = new osg::ClipNode;
osg::BoundingSphere bs = subgraph->getBound();
bs.radius()*= 0.4f;
osg::BoundingBox bb;
bb.expandBy(bs);
clipped_subgraph->createClipBox(bb);
clipped_subgraph->addChild(subgraph);
rootnode->addChild(clipped_subgraph);
*/
// more complex approach to managing ClipNode, allowing
// ClipNode node to be transformed independently from the subgraph
// that it is clipping.
@ -110,34 +92,104 @@ osg::ref_ptr<osg::Node> decorate_with_clip_node(const osg::ref_ptr<osg::Node>& s
}
osg::ref_ptr<osg::Node> simple_decorate_with_clip_node(const osg::ref_ptr<osg::Node>& subgraph)
{
osg::ref_ptr<osg::Group> rootnode = new osg::Group;
// more complex approach to managing ClipNode, allowing
// ClipNode node to be transformed independently from the subgraph
// that it is clipping.
osg::MatrixTransform* transform= new osg::MatrixTransform;
osg::NodeCallback* nc = new osg::AnimationPathCallback(subgraph->getBound().center(),osg::Vec3(0.0f,0.0f,1.0f),osg::inDegrees(45.0f));
transform->setUpdateCallback(nc);
osg::ClipNode* clipnode = new osg::ClipNode;
osg::BoundingSphere bs = subgraph->getBound();
bs.radius()*= 0.4f;
osg::BoundingBox bb;
bb.expandBy(bs);
clipnode->createClipBox(bb);
clipnode->setCullingActive(false);
transform->addChild(clipnode);
rootnode->addChild(transform);
// create clipped part.
osg::Group* clipped_subgraph = new osg::Group;
clipped_subgraph->setStateSet(clipnode->getStateSet());
clipped_subgraph->addChild(subgraph);
rootnode->addChild(clipped_subgraph);
return rootnode;
}
int main( int argc, char **argv )
{
// use an ArgumentParser object to manage the program arguments.
osg::ArgumentParser arguments(&argc,argv);
osgViewer::Viewer viewer(arguments);
// load the nodes from the commandline arguments.
osg::ref_ptr<osg::Group> scene = new osg::Group;
std::string textString;
while(arguments.read("--text", textString))
{
osg::ref_ptr<osgText::Text> text = new osgText::Text;
text->setFont("fonts/times.ttf");
text->setAxisAlignment(osgText::Text::XZ_PLANE);
text->setDrawMode(osgText::Text::TEXT|osgText::Text::ALIGNMENT|osgText::Text::BOUNDINGBOX|osgText::Text::FILLEDBOUNDINGBOX);
text->setText(textString);
scene->addChild(text);
}
osg::ref_ptr<osg::Node> loadedModel = osgDB::readRefNodeFiles(arguments);
if (loadedModel.valid())
{
scene->addChild(scene.get());
}
// if not loaded assume no arguments passed in, try use default mode instead.
if (!loadedModel) loadedModel = osgDB::readRefNodeFile("cow.osgt");
if (scene->getNumChildren()==0)
{
loadedModel = osgDB::readRefNodeFile("cow.osgt");
scene->addChild(loadedModel.get());
}
if (!loadedModel)
if (scene->getNumChildren()==0)
{
osg::notify(osg::NOTICE)<<"Please specify a filename on the command line"<<std::endl;
return 1;
}
// decorate the scenegraph with a clip node.
osg::ref_ptr<osg::Node> rootnode = decorate_with_clip_node(loadedModel);
osg::ref_ptr<osg::Node> rootnode;
if (arguments.read("--simple"))
{
rootnode = simple_decorate_with_clip_node(scene);
}
else
{
rootnode = decorate_with_clip_node(scene);
}
// run optimization over the scene graph
osgUtil::Optimizer optimzer;
optimzer.optimize(rootnode);
osgViewer::Viewer viewer;
// set the scene to render
viewer.setSceneData(rootnode);