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Changeset 8268

Timestamp:

05/01/08 00:31:08

Author:

robert

Message:

Implement traverse exercises

Files:

r8116	r8268
6	6	int main( int argc, char **argv )
7	7	{
8		std::cout<<"TODO "<<argv[0]<<std::endl;
	8	// The scene graph can be manually
	9	// traversed by using dynamic_cast
	10	// to get the Group type and then
	11	// iterate through the children
	12	// then use recursion to traverse
	13	// through the children that are groups.
	14	//
	15
	16	// load the data we wish to traverse
	17	osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("Earth/earth.ive");
	18
	19	// 1. Your task is to implement this manual
	20	// traversal code and print out the
	21	// class types and node nodes of the
	22	// node in the scene graph as your travese it.
	23	//
	24	// 2. Discuss what changes you would need to
	25	// make to this code to handle Group subclasses,
	26	// effects of node masks and node states.
	27	//
	28	// 3. Discuss what changes you would need to
	29	// make to handle scene graph node types that
	30	// unknown to your application.
	31	//
	32	// 4. Discuss how you might insert custom operations
	33	// on nodes encoutered while traversing - such as
	34	// a find name node algorithm,
	35
	36
	37	// Now over to you, write a manual traversers that
	38	// prints out the scene graph as per item.
9	39
10	40	return 0;

r8116	r8268
6	6	int main( int argc, char **argv )
7	7	{
8		std::cout<<"TODO "<<argv[0]<<std::endl;
	8	// load the data we wish to traverse
	9	osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("Earth/earth.ive");
	10
	11	// 1. Following on from 9a_ManualTraversal
	12	// write a custom NodeVisitor that out
	13	// class node types encounted as one
	14	// traveses through all nodes in a scene graph
	15
	16	// 2. Modify the vistor so that it only
	17	// traverses active children
	18
	19	// 3. Modify the visitor so that is capable of finding
	20	// nodes with specific Node name.
	21
	22	// 4. Discuss how the custom NodeVisitor will
	23	// cope with Node types that are unknown to it.
	24	//
	25	// 5. Discuss how one can implement apply(..) methods
	26	// for classes not listed in the NodeVisitor base class.
9	27
10	28	return 0;

r8147	r8268
1	1	#include <osg/ArgumentParser>
2	2	#include <osgDB/ReadFile>
	3	#include <osgViewer/Viewer>
	4
3	5
4	6	#include <iostream>
…	…
6	8	int main( int argc, char **argv )
7	9	{
8		std::cout<<"TODO "<<argv[0]<<std::endl;
	10
	11	// This purpose of this exercise is to
	12	// explore the use of osgUtil::IntersectionVisitor
	13	// and scene graph modification
	14
	15
	16	// scene graph to intersect
	17	osg::ref_ptr<osg::Node> node = osgDB::readNodeFile("cow.osg");
	18
	19	if (!node)
	20	{
	21	std::cout<<"No file loaded."<<std::endl;
	22	return 1;
	23	}
9	24
10		return 0;
	25	// 1. First write code to make a single intersection
	26	// through the center of the loaded model using
	27	// a line segment that passes through from negative
	28	// y position to positive y direction relative to the
	29	// center of the model, and covering the full extents
	30	// of the model.
	31	//
	32	// Report the full X Y Z position of all intersections
	33	// in both object coordinates and world coordinates
	34
	35
	36
	37	// 2. Add into the scene osg::ShapeDrawables, one for each
	38	// each intersection and each of these drawables with
	39	// a osg::Sphere centered at the intersection point and
	40	// with radius 1/50th of the size of the overal model
	41	// radius.
	42
	43	osg::ref_ptr<osg::Group> group = new osg::Group;
	44
	45	group->addChild(node.get());
	46
	47	// need to add ShapeDrawables here...
	48
	49	osgViewer::Viewer viewer;
	50
	51	viewer.setSceneData(group.get());
	52
	53	return viewer.run();
11	54	}