Hello everyone I recently asked some questions about data visualization via different methods. Then I choose to try the QML way. However, I got another problem. I tried looking for solutions on the web for days and I could not find anything useful even for such "simple" problem. I have got my Surface3D qml object with its Surface3DSeries and ItemModelSurfaceDataProxy and the surface is well drawn. Now I want to draw on such surface a few points like in a scatter plot (or like the selection point that appears in the qml surface examples, but more than one). If I draw the Surface3D and then create a Scatter3D object on top of that, the Surface3D will not be visible anymore. If I insert a Scatter3DSeries within the Surface3D object, the complier will give an error because a Scatter3DSeries cannot be used in a Surface3D . If I try to put a ItemModelScatterDataProxy into the Surface3DSeries after the ItemModelSurfaceDataProxy, the points will not appear. In the examples I could not find any case of surface and scatter objects overlapped. Can anyone help me on this Nth problem? Thank you in advance.

Hi @Davide87 A little bit late, but since you mention you only need to add a few scatter points to the surface, I believe you could try with Q3DSurface instead of QML's Surface3D type and use the addCustomItem method to add custom mesh-objects. In the Qt example below, these custom items are an "oil rig" and "refinery". https://doc.qt.io/qt-5.9/qtdatavisualization-customitems-example.html You could define your own mesh object to be a small sphere that you would place at your scatter point positions. All that is not very elegant, of course, but it could help you out.

Your browser does not seem to support JavaScript. As a result, your viewing experience will be diminished, and you have been placed in read-only mode.

Please download a browser that supports JavaScript, or enable it if it's disabled (i.e. NoScript).

QtWS: Super Early Bird Tickets Available!

Overlapped Surface3D and Scatter3D

Solved QML and Qt Quick

8 Posts 3 Posters 2.4k Views

D Offline

D Offline
Davide87
wrote on last edited by Davide87

#1

Hello everyone

I recently asked some questions about data visualization via different methods. Then I choose to try the QML way.
However, I got another problem. I tried looking for solutions on the web for days and I could not find anything useful even for such "simple" problem.

I have got my Surface3D qml object with its Surface3DSeries and ItemModelSurfaceDataProxy and the surface is well drawn. Now I want to draw on such surface a few points like in a scatter plot (or like the selection point that appears in the qml surface examples, but more than one).

If I draw the Surface3D and then create a Scatter3D object on top of that, the Surface3D will not be visible anymore.
If I insert a Scatter3DSeries within the Surface3D object, the complier will give an error because a Scatter3DSeries cannot be used in a Surface3D .
If I try to put a ItemModelScatterDataProxy into the Surface3DSeries after the ItemModelSurfaceDataProxy, the points will not appear.

In the examples I could not find any case of surface and scatter objects overlapped.

Can anyone help me on this Nth problem?
Thank you in advance.
D 1 Reply Last reply
0
D Offline

D Offline
Davide87
wrote on last edited by

#2

Anyone? :-(
Is it even possible to draw a Surface3D and a Scatter3D within the same axis?
1 Reply Last reply
0
D Offline

D Offline
Davide87
wrote on last edited by

#3

Last up :-(
1 Reply Last reply
0
S Offline

S Offline
SGaist Lifetime Qt Champion
wrote on last edited by

#4

Hi,

Sorry nobody can help you with your situation.

You should try to post it on the interest mailing list. You'll find there Qt's developers/maintainers. This forum is more user oriented.
Interested in AI ? www.idiap.ch
Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct

1 Reply Last reply
0
D Offline

D Offline
Diracsbracket
replied to Davide87 on last edited by Diracsbracket

#5

Hi @Davide87
A little bit late, but since you mention you only need to add a few scatter points to the surface, I believe you could try with Q3DSurface instead of QML's Surface3D type and use the addCustomItem method to add custom mesh-objects. In the Qt example below, these custom items are an "oil rig" and "refinery".

https://doc.qt.io/qt-5.9/qtdatavisualization-customitems-example.html

You could define your own mesh object to be a small sphere that you would place at your scatter point positions.

All that is not very elegant, of course, but it could help you out.
D 1 Reply Last reply
1
D Offline

D Offline
Davide87
replied to Diracsbracket on last edited by

#6

@SGaist Thank you. I wrote to that mailing list, but unfortunately no one answered me :-(

@Diracsbracket I'll try it and let you know. Thanks.
1 Reply Last reply
0
D Offline

D Offline
Davide87
wrote on last edited by Davide87

#7

It works good!

I took the sphere from Qt\5.11.1\Src\qtdatavis3d\src\datavisualization\engine\meshes. Then I added the custom item as in that example.
The Q3DSurface class works perfectly. Furthermore now I don't need to get crazy passing things from c++ to qml.

That's the result:

Thank you very much guys.

ps: Maybe "QML and Qt Quick" is no more the appropriate section for this topic :-D
D 1 Reply Last reply
1
D Offline

D Offline
Diracsbracket
replied to Davide87 on last edited by

#8

@Davide87 said in Overlapped Surface3D and Scatter3D:

Qt\5.11.1\Src\qtdatavis3d\src\datavisualization\engine\meshes

Great to hear, and thank you for the feedback!
Thanks to this question, I also got to learn about the awesome software used to create the meshes:
https://www.blender.org/
1 Reply Last reply
0