osg之基本图元（一）

最新推荐文章于 2024-04-26 10:51:13 发布

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最新推荐文章于 2024-04-26 10:51:13 发布

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分类专栏： osg

本文链接：https://blog.youkuaiyun.com/u012288722/article/details/78473253

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基本图元包括了创建一个形状的物体，并且设置它的材质，颜色等。

osg::ref_ptr<osg::Geode> CreateeBox()
{
  osg::ref_ptr<osg::Geode> geode=new osg::Geode;
  osg::ref_ptr<osg::TessellationHints> hints=new osg::TessellationHints;
  osg::ref_ptr<osg::ShapeDrawable> shape=new osg::ShapeDrawable(new osg::Box(osg::Vec3(0.0,0.0,0.0),1.0,10.0,10.0),hints);
  osg::ref_ptr<osg::Material> material=new osg::Material;
  osg::ref_ptr<osg::Texture2D> texture2D=new osg::Texture2D;
  osg::ref_ptr<osg::Image> image;

  //设置颜色
  shape->setColor(osg::Vec4(0.5,0.5,0.5,0.5));

  //设置精度
  hints->setDetailRatio(0.5);

  //设置材质
  material->setAmbient(osg::Material::FRONT_AND_BACK,osg::Vec4f(1.0,1.0,1.0,0.5));
  material->setDiffuse(osg::Material::FRONT_AND_BACK,osg::Vec4f(1.0,1.0,1.0,0.5));
  material->setSpecular(osg::Material::FRONT_AND_BACK,osg::Vec4f(1.0,1.0,1.0,0.5));
  material->setShininess(osg::Material::FRONT_AND_BACK,6.0);

  //设置纹理
  image=osgDB::readImageFile("D:/OSG/data/MMI_IMAGE.JPG");
  if (image->valid())
  {
      texture2D->setImage(image);
  }

  geode->getOrCreateStateSet()->setAttributeAndModes(material,osg::StateAttribute::ON);
  geode->getOrCreateStateSet()->setMode(GL_BLEND,osg::StateAttribute::ON);
  geode->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,osg::StateAttribute::ON);
  geode->getOrCreateStateSet()->setTextureAttributeAndModes(0,texture2D,osg::StateAttribute::ON);
  geode->addDrawable(shape);

  return geode;
}

int main()
{
  osg::ref_ptr<osgViewer::Viewer> viewer=new osgViewer::Viewer;
  viewer->setSceneData(CreateeBox());
  return viewer->run();
}