OSG3.4.0碰撞检测（上）

最新推荐文章于 2022-09-01 16:36:56 发布

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最新推荐文章于 2022-09-01 16:36:56 发布

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分类专栏： OSG基础知识文章标签： OSG OpenSceneGraph

本文链接：https://blog.youkuaiyun.com/david_chenghao/article/details/79692789

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写在前面的话：目前学习碰撞检测的所有代码，供小白使用！

#include <osgViewer/Viewer>
#include <osgDb/ReadFile>
#include <osgGA/GUIEventAdapter>
#include <osgViewer/ViewerEventHandlers>
#include <osgGA/TrackballManipulator>
#include <osg/Geode>
#include <osg/ShapeDrawable>
#include <osg/Material>
#include <osg/StateSet>
#include <osg/Texture2D>
#include <osg/Image>
#include <osg/LineWidth>
#include <osgUtil/IntersectionVisitor>

#include <iostream>

// 画正方体
osg::ref_ptr<osg::Geode> CreatBox()
{
	osg::ref_ptr<osg::Geode> geode = new osg::Geode;
	geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(0, 0, 0), 10.0, 10.0, 10.0)));
	//geode->addDrawable(new osg::ShapeDrawable(new osg::Box(osg::Vec3(0, 0, 0), 0.1, 0.1, 20)));
	return geode;
}

// 画线
osg::ref_ptr<osg::Geode> CreateLine(const osg::Vec3 &start, const osg::Vec3 &end)
{
	osg::ref_ptr<osg::Geode> geode = new osg::Geode;
	osg::ref_ptr<osg::Geometry> gy = new osg::Geometry;
	osg::ref_ptr<osg::Vec3Array> coords = new osg::Vec3Array;
	// ===========================================================================
	geode->addDrawable(gy);
	gy->setVertexArray(coords);
	coords->push_back(start);
	coords->push_back(end);
	gy->addPrimitiveSet(new osg::DrawArrays(osg::PrimitiveSet::LINE_LOOP, 0, 2));
	// ============================================================================
	return geode;
}

// 画球
osg::ref_ptr<osg::Geode> CreateSphere(osg::Vec3d center)
{
	osg::ref_ptr<osg::Geode> geode = new osg::Geode;
	geode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(center, 0.5)));
	return geode;
}

int main()
{
	osg::ref_ptr<osgViewer::Viewer> viewer = new osgViewer::Viewer;
	osg::ref_ptr<osg::Group> group = new osg::Group;
	osg::Vec3 start = osg::Vec3(-10, 7, 15);
	osg::Vec3 end = osg::Vec3(5, -4, -12);

	viewer->addEventHandler(new osgViewer::StatsHandler);
	viewer->addEventHandler(new osgViewer::WindowSizeHandler); // 窗口尺寸

	// 碰撞检测
	osgUtil::LineSegmentIntersector::Intersections intersections;
	osg::ref_ptr<osgUtil::LineSegmentIntersector> ls = new osgUtil::LineSegmentIntersector(start, end);
	osg::ref_ptr<osgUtil::IntersectionVisitor> iv = new osgUtil::IntersectionVisitor(ls);

	osg::ref_ptr<osg::Geode> node = CreatBox();
	group->addChild(node);
	node->accept(*iv.get());
	group->addChild(CreateLine(start, end));

	// 如果有碰撞，则输出所有交点
	if (ls->containsIntersections())
	{
		intersections = ls->getIntersections();
		for (osgUtil::LineSegmentIntersector::Intersections::iterator iter = intersections.begin(); iter != intersections.end(); iter++)
		{
			std::cout << iter->getWorldIntersectPoint().x() << "  " << iter->getWorldIntersectPoint().y() << "  " << iter->getWorldIntersectPoint().z() << std::endl;
			group->addChild(CreateSphere(iter->getWorldIntersectPoint()));
		}
	}

	viewer->setSceneData(group);
	return viewer->run();
}