效果

直接上源码

• 需要包含的头文件很多,这里没全贴上
• 多定义XYZ枚举类
• 代码复制就能用

#include <osg/ShapeDrawable>    // osg::ShapeDrawable

typedef enum Axis {
    X,Y,Z,NONE
}Axis;

/*  @return 返回xyz坐标轴的组节点 */
osg::ref_ptr<osg::Group> makeCoordinate()
{
    // 创建空组节点
    osg::ref_ptr<osg::Group> group = new osg::Group();

    // 精细度类并设置对应精细度 值越小精度也就越小
    osg::ref_ptr<osg::TessellationHints> hits = new osg::TessellationHints;
    hits->setDetailRatio(10.0f);

    // 定义坐标轴长度和半径
    float len = 200;
    float radius = 10;

    // 定义三种颜色
    osg::Vec4 blue = osg::Vec4(0.0f, 0.0f, 1.0f, 1.0f);
    osg::Vec4 red = osg::Vec4(1.0f, 0.0f, 0.0f, 1.0f);
    osg::Vec4 green = osg::Vec4(0.0f, 1.0f, 0.0f, 1.0f);

    // 坐标轴圆心为黑体球体
    osg::ref_ptr<osg::Sphere> sphere = new osg::Sphere(osg::Vec3(0, 0, 0), radius*1.5);
    osg::ref_ptr<osg::ShapeDrawable> sphereDrawable = new osg::ShapeDrawable(sphere.get());
    sphereDrawable->setColor(osg::Vec4f(0.0, 0.0, 0.0, 1.0));
    group->addChild(sphereDrawable);

    for (int i = 0; i < 3; ++i) {
        osg::ref_ptr<osg::Cylinder> cylinder = new osg::Cylinder(osg::Vec3(0.0, 0.0, len/2), 10, len);  // 创建几何信息对象 (center,radius,height)
        osg::ref_ptr<osg::Cone> cone = new osg::Cone(osg::Vec3(0.0, 0.0, len), radius*1.5, radius*3);
        osg::ref_ptr<osg::ShapeDrawable> cylinderDrawable = new osg::ShapeDrawable(cylinder.get());     // 创建几何体,几何信息加入到几何体
        osg::ref_ptr<osg::ShapeDrawable> coneDrawable = new osg::ShapeDrawable(cone.get());
        osg::ref_ptr<osgText::Text> pTextXAuxis = new osgText::Text;                     // 创建字体节点

        osg::ref_ptr<osg::MatrixTransform> axisTransform = new osg::MatrixTransform();   // 创建转换节点
        axisTransform->addChild(cylinderDrawable);                                       // 将圆柱圆锥和字体加入转换矩阵节点中
        axisTransform->addChild(coneDrawable);
        axisTransform->addChild(pTextXAuxis);

        cylinderDrawable->setTessellationHints(hits);   // 设置精细度
        coneDrawable->setTessellationHints(hits);

        Axis axis = static_cast<Axis>(i);
        switch (axis) {
        case X:
            axisTransform->setMatrix(osg::Matrix::rotate(osg::inDegrees(90.0), osg::Y_AXIS));   // 绕Y轴旋转90°
            cylinderDrawable->setColor(red);
            coneDrawable->setColor(red);
            pTextXAuxis->setText(L"X轴");
            break;
        case Y:
            axisTransform->setMatrix(osg::Matrix::rotate(osg::inDegrees(-90.0), osg::X_AXIS));  // 绕X轴旋转90°
            cylinderDrawable->setColor(green);
            coneDrawable->setColor(green);
            pTextXAuxis->setText(L"Y轴");
            break;
        case Z:
            axisTransform->setMatrix(osg::Matrix::rotate(osg::inDegrees(90.0), osg::Z_AXIS));   // 绕Z轴旋转90°
            cylinderDrawable->setColor(blue);
            coneDrawable->setColor(blue);
            pTextXAuxis->setText(L"Z轴");

            break;
        }
        pTextXAuxis->setPosition(osg::Vec3(0.0f, 0.0f, len));   // 设置字的位置
        pTextXAuxis->setAxisAlignment(osgText::Text::SCREEN);   // 设置字一直保持正面朝向屏幕
        pTextXAuxis->setCharacterSize(64);
        group->addChild(axisTransform.get());                   // 将其中单个轴节点加入组节点中
    }

    return group;
}