qt3D中为什么使用自定义材质 QMaterial 赋给实体没有效果

[BAIY]

我使用自定义的材质QMaterial 赋给一个三维圆环，显示为一片空白，而使用预置材质QPhongMaterial可以正常显示。以下是我的源码：
Qt3DCore::QEntity* createTorusWithGradient(Qt3DCore::QEntity* rootEntity)
{
Qt3DCore::QEntity* torusEntity = new Qt3DCore::QEntity(rootEntity);

// 圆环网格
Qt3DExtras::QTorusMesh* torusMesh = new Qt3DExtras::QTorusMesh(torusEntity);
torusMesh->setRadius(5.0f);
torusMesh->setMinorRadius(1.0f);
torusMesh->setRings(100);
torusMesh->setSlices(20);
torusEntity->addComponent(torusMesh);

// 变换组件（可选）
Qt3DCore::QTransform* transform = new Qt3DCore::QTransform(torusEntity);
transform->setScale3D(QVector3D(1.5, 1.5, 01.5));
transform->setRotation(QQuaternion::fromAxisAndAngle(QVector3D(1, 0, 0), 60.0f));
torusEntity->addComponent(transform);

Qt3DExtras::QPhongMaterial* torusMaterial = new Qt3DExtras::QPhongMaterial();
torusMaterial->setDiffuse(QColor(QRgb(0x000000)));

QMaterial* material1 = new QMaterial(torusEntity);
QMaterial* material2 = new QMaterial(torusEntity);

// Create effect, technique, render pass and shader
QEffect* effect1 = new QEffect();
QTechnique* gl3Technique = new QTechnique();
QRenderPass* gl3Pass = new QRenderPass();
QShaderProgram* glShader = new QShaderProgram();

// Set the shader on the render pass
gl3Pass->setShaderProgram(glShader);

// Add the pass to the technique
gl3Technique->addRenderPass(gl3Pass);

// Set the targeted GL version for the technique
gl3Technique->graphicsApiFilter()->setApi(QGraphicsApiFilter::OpenGL);
gl3Technique->graphicsApiFilter()->setMajorVersion(3);
gl3Technique->graphicsApiFilter()->setMinorVersion(3);
gl3Technique->graphicsApiFilter()->setProfile(QGraphicsApiFilter::CoreProfile);

// Add the technique to the effect
effect1->addTechnique(gl3Technique);

// Set the effect on the materials
material1->setEffect(effect1);
material2->setEffect(effect1);

// Set different parameters on the materials
const QString parameterName = QStringLiteral("color");
material1->addParameter(new QParameter(parameterName, QColor::fromRgbF(0.0f, 1.0f, 0.0f, 1.0f)));
material2->addParameter(new QParameter(parameterName, QColor::fromRgbF(1.0f, 0.0f, 1.0f, 1.0f)));
// 添加组件到实体
torusEntity->addComponent(material1);

// 监听编译状态
QObject::connect(shaderProgram, &Qt3DRender::QShaderProgram::statusChanged,
    [=](Qt3DRender::QShaderProgram::Status status) {
        if (status == Qt3DRender::QShaderProgram::Error) {
            qDebug() << "Shader Error:" << shaderProgram->log();
        }
    });

return torusEntity;

}
自定义材质运行结果：一片空白

预置材质运行结果：黑色圆环

请大神帮忙看看哪里有问题吗，自定义材质设置的不对吗，我用的是官方示例啊，请大神解惑，多谢！！！

[Christian Ehrlicher]

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