OSG-简单的绘制一个坐标轴

本文主要是介绍OSG-简单的绘制一个坐标轴，希望对大家解决编程问题提供一定的参考价值，需要的开发者们随着小编来一起学习吧！

学习了可绘制Drawable的基本知识，打算绘制一个简单的坐标轴。

效果图如下：

代码如下：

osg::Geode* makeCoordinate()
{osg::ref_ptr<osg::Sphere> pSphereShape = new osg::Sphere(osg::Vec3(0,0,0), 10.0f);osg::ref_ptr<osg::ShapeDrawable> pShapeDrawable = new osg::ShapeDrawable(pSphereShape.get());pShapeDrawable->setColor(osg::Vec4(0.0, 0.0, 0.0, 1.0));//创建保存几何信息的对象osg::ref_ptr<osg::Geometry> geom = new osg::Geometry();//创建四个顶点osg::ref_ptr<osg::Vec3Array> v = new osg::Vec3Array();v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));v->push_back(osg::Vec3(1000.0f, 0.0f, 0.0f));v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));v->push_back(osg::Vec3(0.0f, 1000.0f, 0.0f));v->push_back(osg::Vec3(0.0f, 0.0f, 0.0f));v->push_back(osg::Vec3(0.0f, 0.0f, 1000.0f));geom->setVertexArray(v.get());//为每个顶点指定一种颜色osg::ref_ptr<osg::Vec4Array> c = new osg::Vec4Array();c->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)); //坐标原点为红色c->push_back(osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f)); //x redc->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); //坐标原点为绿色c->push_back(osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f)); //y greenc->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); //坐标原点为蓝色c->push_back(osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f)); //z blue//如果没指定颜色则会变为黑色geom->setColorArray(c.get());geom->setColorBinding(osg::Geometry::BIND_PER_VERTEX); //三个轴geom->addPrimitiveSet( new osg::DrawArrays(osg::PrimitiveSet::LINES, 0, 2)); //Xgeom->addPrimitiveSet( new osg::DrawArrays(osg::PrimitiveSet::LINES, 2, 2)); //Ygeom->addPrimitiveSet( new osg::DrawArrays(osg::PrimitiveSet::LINES, 4, 2)); //Zosg::ref_ptr<osgText::Text> pTextXAuxis = new osgText::Text;pTextXAuxis->setText(L"X轴");pTextXAuxis->setFont("Fonts/simhei.ttf");pTextXAuxis->setAxisAlignment(osgText::Text::SCREEN);pTextXAuxis->setCharacterSize(64);pTextXAuxis->setPosition(osg::Vec3(1000.0f, 0.0f, 0.0f));osg::ref_ptr<osgText::Text> pTextYAuxis = new osgText::Text;pTextYAuxis->setText(L"Y轴");pTextYAuxis->setFont("Fonts/simhei.ttf");pTextYAuxis->setAxisAlignment(osgText::Text::SCREEN);pTextYAuxis->setCharacterSize(64);pTextYAuxis->setPosition(osg::Vec3(0.0f, 1000.0f, 0.0f));osg::ref_ptr<osgText::Text> pTextZAuxis = new osgText::Text;pTextZAuxis->setText(L"Z轴");pTextZAuxis->setFont("Fonts/simhei.ttf");pTextZAuxis->setAxisAlignment(osgText::Text::SCREEN);pTextZAuxis->setCharacterSize(64);pTextZAuxis->setPosition(osg::Vec3(0.0f, 0.0f, 1000.0f));osg::ref_ptr<osg::Geode> geode = new osg::Geode();geode->getOrCreateStateSet()->setMode(GL_LIGHTING, osg::StateAttribute::OFF);geode->getOrCreateStateSet()->setAttribute(new osg::LineWidth(3.0),  osg::StateAttribute::ON);geode->addDrawable(pShapeDrawable.get());geode->addDrawable(geom.get());geode->addDrawable(pTextXAuxis.get());geode->addDrawable(pTextYAuxis.get());geode->addDrawable(pTextZAuxis.get());return geode.release();
}

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