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.

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Overlapped Surface3D and Scatter3D

Solved QML and Qt Quick

8 Posts 3 Posters 2.5k Views

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Davide87

wrote on 11 Jul 2018, 11:09 last edited by Davide87 7 Nov 2018, 11:14

#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 29 Jul 2018, 06:21

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Davide87

wrote on 12 Jul 2018, 11:09 last edited by

#2

Anyone? :-(
Is it even possible to draw a Surface3D and a Scatter3D within the same axis?
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Davide87

wrote on 22 Jul 2018, 20:00 last edited by

#3

Last up :-(
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SGaist
Lifetime Qt Champion
wrote on 22 Jul 2018, 22:03 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.
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Please read the Qt Code of Conduct - https://forum.qt.io/topic/113070/qt-code-of-conduct
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D Davide87
11 Jul 2018, 11:09

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.
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Diracsbracket

wrote on 29 Jul 2018, 06:21 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 30 Jul 2018, 11:19

1
D Diracsbracket
29 Jul 2018, 06:21

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.
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Davide87

wrote on 30 Jul 2018, 11:19 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.
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Davide87

wrote on 9 Aug 2018, 08:45 last edited by Davide87 8 Sept 2018, 08:48

#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 9 Aug 2018, 09:22

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D Davide87
9 Aug 2018, 08:45

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
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Diracsbracket

wrote on 9 Aug 2018, 09:22 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/
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