Qt3D - [c++] QExtrudedTextMesh gets overlayed by lower QCuboidMesh

kevin_d

HI!

I have a QCuboidMesh with a certain z-extend.
Also, i transform it for test reason to a factor of 0.001.
Additionally, i place a QExtrudedTestMesh vertically significant above the cuboid.

Unfortunately, the TextMesh gets randomly replaced by the pixel-contents of the cuboid, although its z-position is lower than the text's.

I have tried layers, layerfilters and raycasters, but the text gets cropped by the cuboid screen values, obviously clipping after the text.

Is there an advice of how to render the entities according to their world coordinates?
Is there the usage of QLayers, to stack objects visually above each others? or ...
Can i trigger the order in which the entities are drawn? So to draw the "lower" entities first?

best regards

Code:

EntityClassA : QEntity(root)
{
    auto* tile = Qt3DExtras::QCuboidMesh(root);
    tile->setXExtend(1);
    tile->setYExtend(1);
    tile->setZExtend(0.01);

    Qt3DCore::QTransform scale = new Qt3DCore::QTransform;
    scale->setScale3D(QVector(1, 1, 0.001);
    addComponent(scale);
    addComponet(tile);
}

EntityClassB : QEntity(root)
{
    auto* text = new Qt3DExtras::QExtrudedTextMesh(root);
    text->setText("A1");
    Qt3DCore::QTransform scaleText = new Qt3DCore::QTransform;
    scaleText->setTranslation(x,y, properZValue);
    addComponent(scaleText);
    addComponent(text);
}

kevin_d

Significally, if i set an opaque material onto the cuboid, i observe, that some texts are treated as if they were "inside" the cuboid, which is physically not the case.

kevin_d

Finally the scene gets properly rendered by explicietely setting the QSortPolicy on the frameGraph:

Qt3DRender::QFrameGraphNode *framegraph = view.activeFrameGraph();
Qt3DRender::QSortPolicy *sortPolicy = new Qt3DRender::QSortPolicy(scene);
framegraph->setParent(sortPolicy);
QVector<Qt3DRender::QSortPolicy::SortType> sortTypes = 
      QVector<Qt3DRender::QSortPolicy::SortType>() << Qt3DRender::QSortPolicy::BackToFront;
sortPolicy->setSortTypes(sortTypes);
view.setActiveFrameGraph(framegraph);