A weird bug? Why is there no spatial depth in my 3D scene?
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Sorry, as a noobie, I can't offer any insight, but I ran the code, and I'm getting the same as Finn. I'm on Qt 5.7 on Win 10.
Could it be CPU or GPU related? I'm on a 6coreAMD machine.
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Sorry, as a noobie, I can't offer any insight, but I ran the code, and I'm getting the same as Finn. I'm on Qt 5.7 on Win 10.
Could it be CPU or GPU related? I'm on a 6coreAMD machine.
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@Ian-Bray Thank you for your reply, this was very helpful! I would suggest that someone more experienced than me should report this as a bug.
@Finn said in A weird bug? Why is there no spatial depth in my 3D scene?:
this was very helpfu
Indeed, it was.
I would suggest that someone more experienced than me should report this as a bug.
There's nothing to it, you just describe the problem and attach the screenshots and the code from upstairs as a minimal reproducible example (preferably with a simple project file). As for the problem itself it may be helpful if we can squeeze some more information out. I may be running a newer (or older) version of Qt compared to you. Can you both state the full version (with patch number). I'm running Qt 5.7.2 built from git some time ago on a Linux 4.8.11 kernel.
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@Finn said in A weird bug? Why is there no spatial depth in my 3D scene?:
this was very helpfu
Indeed, it was.
I would suggest that someone more experienced than me should report this as a bug.
There's nothing to it, you just describe the problem and attach the screenshots and the code from upstairs as a minimal reproducible example (preferably with a simple project file). As for the problem itself it may be helpful if we can squeeze some more information out. I may be running a newer (or older) version of Qt compared to you. Can you both state the full version (with patch number). I'm running Qt 5.7.2 built from git some time ago on a Linux 4.8.11 kernel.
I'm using qt-opensource-windows-x86-mingw530-5.7.0 on Win 10, if I get a chance I'll try it on Linux later.
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Sorry, this isn't going to be helpful. Just to report that both slabs of code crashed on Qt 5.7.1 GCC 64 on latest Mint.
Possibly due to lack of RAM. Not sure. -
Sorry, this isn't going to be helpful. Just to report that both slabs of code crashed on Qt 5.7.1 GCC 64 on latest Mint.
Possibly due to lack of RAM. Not sure. -
Then probably it's a bug that was fixed with the patch version in the meantime. Cheers!
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@Finn Thanks Finn. I'll update later!
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@kshegunov Must have been quite a big one. I ran the 3d Materials Example on 5.7.0 two days ago - it was horrible. I updated to 5.7.1 yesterday and ran it again - works perfect now.
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@kshegunov Must have been quite a big one. I ran the 3d Materials Example on 5.7.0 two days ago - it was horrible. I updated to 5.7.1 yesterday and ran it again - works perfect now.
Well, 5.7.0 was Qt3D's first official release, and the code hasn't matured as much as the other modules, so some bumps along the road are expected. My biggest beef with Qt3D actually is its very thin documentation, but I'm sure that'll improve with time.:)
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I want to use
Qt3DwithinQt5.7to plot a 3D scene (a chemical molecule) which I want to rotate.
The problem is that my 3D objects are not displayed according to their spatial positioning. The last createdQEntityis always in the foreground, regardless of how I rotate the camera.
In the minimum working example below, theQEntitysmallGreenSphereis always in the foreground even though it is spatially positioned behindbigRedSpherein the default view specified in the camera settings.
To rephrase the problem: My 3D scene has no depth.Please note that
smallGreenSphereis instantiated afterbigRedSpherein themain.cppfile shown below:#include <QGuiApplication> #include <Qt3DCore> #include <Qt3DRender> #include <Qt3DExtras> Qt3DCore::QEntity* createTestScene() { Qt3DCore::QEntity* root = new Qt3DCore::QEntity; Qt3DCore::QEntity* bigRedSphere = new Qt3DCore::QEntity(root); Qt3DCore::QEntity* smallGreenSphere = new Qt3DCore::QEntity(root); Qt3DExtras::QSphereMesh* bigMesh = new Qt3DExtras::QSphereMesh; bigMesh->setRadius(5); bigMesh->setRings(100); bigMesh->setSlices(20); Qt3DExtras::QSphereMesh* smallMesh = new Qt3DExtras::QSphereMesh; smallMesh->setRadius(2); smallMesh->setRings(100); smallMesh->setSlices(20); Qt3DExtras::QPhongMaterial* redMaterial = new Qt3DExtras::QPhongMaterial; redMaterial->setSpecular(Qt::white); redMaterial->setShininess(10); redMaterial->setAmbient(Qt::red); Qt3DExtras::QPhongMaterial* greenMaterial = new Qt3DExtras::QPhongMaterial; greenMaterial->setSpecular(Qt::white); greenMaterial->setShininess(10); greenMaterial->setAmbient(Qt::green); Qt3DCore::QTransform* transform = new Qt3DCore::QTransform; transform->setTranslation(QVector3D(0,0,10)); bigRedSphere->addComponent(redMaterial); bigRedSphere->addComponent(bigMesh); smallGreenSphere->addComponent(greenMaterial); smallGreenSphere->addComponent(smallMesh); smallGreenSphere->addComponent(transform); return root; } int main(int argc, char* argv[]) { QGuiApplication app(argc, argv); Qt3DExtras::Qt3DWindow view; Qt3DCore::QEntity* scene = createTestScene(); // camera Qt3DRender::QCamera *camera = view.camera(); camera->lens()->setPerspectiveProjection(45, 16./9., 0.1,1000.); camera->setPosition(QVector3D(30., 0, 60.)); camera->setViewCenter(QVector3D(0, 0, 0)); // manipulator Qt3DExtras::QOrbitCameraController* manipulator = new Qt3DExtras::QOrbitCameraController(scene); manipulator->setLinearSpeed(50); manipulator->setLookSpeed(180); manipulator->setCamera(camera); view.setRootEntity(scene); view.show(); return app.exec(); }This results in the following scene:
Please note that I did not rotate anything manually and that this is the output of the code above.If I now swap the order of instantiation in
createTestScene()byQt3DCore::QEntity* smallGreenSphere = new Qt3DCore::QEntity(root); Qt3DCore::QEntity* bigRedSphere = new Qt3DCore::QEntity(root);so that
bigRedSphereis now instantiated aftersmallGreenSphere, thebigRedSphereis always in the foreground and the resulting scene (again without manual rotation) looks like this:
This proves that the order of instantiation determines what sphere is displayed in the foreground.
How can I obtain the correct 3D view regardless of the order of instantiation? Do I have to use some different rendering technique?
Thanks in advance for your help and please consider that I am new to Qt, Qt3D, and rendering in your answer.For further reference this issue seems solved as described in this post.
