Qt 3D中的QSphereMesh：我怎样才能在其上正确添加纹理？

Question

我想在Qt 3D中绘制一个半透明的纹理球体（在其上绘制某种颜色图）。

我正在尝试绘制球体并添加纹理。纹理在球体的某些区域非常适合，但是在极点附近的poligons上它会变得嘶哑。

你能告诉我，我的错误是什么？

这是我尝试绘制球体的代码：

#include <QApplication>

#include <Qt3DExtras/Qt3DWindow>
#include <Qt3DCore/QEntity>
#include <Qt3DExtras/QSphereMesh>
#include <Qt3DExtras/QTextureMaterial>
#include <Qt3DExtras/QOrbitCameraController>
#include <Qt3DRender/QTexture>
#include <QPhongAlphaMaterial>
#include <qt3dwindow.h>
#include <QtWidgets/QWidget>

#include <qcamera.h>
#include <qforwardrenderer.h>

int main(int argc, char *argv[])
{
    QApplication a(argc, argv);

    Qt3DExtras::Qt3DWindow* m_view = new Qt3DExtras::Qt3DWindow();
    QWidget* container = QWidget::createWindowContainer(m_view);
    container->show();

    Qt3DCore::QEntity* m_rootEntity = new Qt3DCore::QEntity();
    m_view->setRootEntity(m_rootEntity);
    m_view->defaultFrameGraph()->setClearColor(QColor(QRgb(0x4d4d4f)));

    // let's make a sphere
    Qt3DCore::QEntity* m_sphereEntity = new Qt3DCore::QEntity(m_rootEntity);
    Qt3DExtras::QSphereMesh* m_sphereMesh = new Qt3DExtras::QSphereMesh();
    m_sphereMesh->setRadius(12.);
    m_sphereEntity->addComponent(m_sphereMesh);

    // and glue some texture onto our sphere
    Qt3DRender::QTextureLoader *loader = new Qt3DRender::QTextureLoader(m_sphereEntity);
    Qt3DExtras::QTextureMaterial *material = new Qt3DExtras::QTextureMaterial(m_sphereEntity);
    loader->setSource(QUrl::fromLocalFile(a.applicationDirPath() + QStringLiteral("/temp1.png")));
    material->setTexture(loader);
    m_sphereEntity->addComponent(material);


    // initialise camera

    Qt3DRender::QCamera *camera = m_view->camera();
    camera->lens()->setPerspectiveProjection(45.0, 16.0 / 9.0, 0.1, 1000.0);
    camera->setPosition(QVector3D(0.0, 0.0, 40.0));
    camera->setViewCenter(QVector3D(0.0, 0.0, 0.0));

    // For camera controls.
    Qt3DExtras::QOrbitCameraController *camController = new Qt3DExtras::QOrbitCameraController(m_rootEntity);
    camController->setLinearSpeed(50.0);
    camController->setLookSpeed(180.0);
    camController->setCamera(camera);


    return a.exec();
}

这是temp1.png（色彩图的纹理）：

这是我纹理严重的球体的截图：

P.S。另外，你能告诉我，有没有办法在我的Qt 3D纹理素材中添加alpha通道？这对我来说非常有用。