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VolumeRendering.md

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OSG三维纹理映射(体渲染)

osg::ref_ptr<osg::Node> OsgWidget::getEarthSphiere()
{
    osg::ref_ptr<osg::Group> pGroop = new osg::Group;
#if 1
    {
        // 绘制球体
        // 步骤一：绘制几何类型(几何体)
        osg::ref_ptr<osg::Geode> pGeode = new osg::Geode;
        qreal radius = 1.0;
        pGeode->addDrawable(new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0, 0, 0), radius)));
#if 1
        // 步骤二：加载图片添加纹理
        osg::ref_ptr<osg::Image> pImage;
        pImage = osgDB::readImageFile("D:/qtProject/osgDemo/osgDemo/modules/osgWidget/image/earth.bmp");
        if(!pImage->valid())
        {
            LOG_WARN(QString("Failed to load image: %1").arg(QString::fromStdString(pImage->getFileName())));
        }
//        qDebug() << __FILE__ << __LINE__ << osgDB::writeImageFile(*pImage.get(), "1.bmp");
        osg::ref_ptr<osg::Texture2D> pTexture2D = new osg::Texture2D;
//        pTexture2D->setDataVariance(osg::Object::DYNAMIC);
        pTexture2D->setImage(pImage.get());
        // 步骤三：渲染设置
        osg::ref_ptr<osg::StateSet> pStateSet = pGeode->getOrCreateStateSet();
        pStateSet->setTextureAttribute(0, pTexture2D.get());
        pStateSet->setTextureMode(0, GL_TEXTURE_2D, osg::StateAttribute::ON);
        pGeode->setStateSet(pStateSet);
#endif
        pGroop->addChild(pGeode);
    }
#endif
    return pGroop.get();
}
  • 球体渲染的时候有黑色的缝隙

    • 首先要排除图片纹理本身边框的问题，然后修改渲染的边界处理方式和插值方式：

       // 步骤二：创建纹理
     osg::ref_ptr<osg::Texture2D> pTexture2D = new osg::Texture2D;
     pTexture2D->setImage(pImage);
     pTexture2D->setUnRefImageDataAfterApply(true);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP);
     pTexture2D->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_EDGE);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::CLAMP_TO_BORDER);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::REPEAT);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_S, osg::Texture2D::MIRROR);
  
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP);
     pTexture2D->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_EDGE);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::CLAMP_TO_BORDER);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::REPEAT);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_T, osg::Texture2D::MIRROR);
  
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_R, osg::Texture2D::CLAMP);
     pTexture2D->setWrap(osg::Texture2D::WRAP_R, osg::Texture2D::CLAMP_TO_EDGE);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_R, osg::Texture2D::CLAMP_TO_BORDER);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_R, osg::Texture2D::REPEAT);
 //    pTexture2D->setWrap(osg::Texture2D::WRAP_R, osg::Texture2D::MIRROR);
  
  
 //    pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
 //    pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR_MIPMAP_LINEAR);
 //    pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR_M/IPMAP_NEAREST);
 //    pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST);
 //    pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST_MIPMAP_LINEAR);
     pTexture2D->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::NEAREST_MIPMAP_NEAREST);
 //    pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
 //    pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR_MIPMAP_LINEAR);
 //    pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR_MIPMAP_NEAREST);
 //    pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST);
 //    pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST_MIPMAP_LINEAR);
     pTexture2D->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::NEAREST_MIPMAP_NEAREST);