mouse click on Vsg::node

[hasanshamsijeze]

Hello, I want to detect which Vsg ::node is clicked when I click on a specific Vsg::node on the screen using the mouse. Additionally, I want to perform a specific action, such as printing a message like "Node X clicked."

My model represents the Earth, and my nodes are objects created using the Node class in VSG

[jacky-wang7]

Maybe this example can help you：vsgintersection

[robertosfield]

The vsg::LineSegmentIntersector and vsg::PolytopeIntersector classes provide intersection with scene graph support. As @jacky-wang7 mentioned the vsgintersection example illustrates how these are used.

[hasanshamsijeze]

this add a visitor to vsg::viewer it is OK for my my problem is this.
i have a base model that add to vsg::Viewer with this code

    auto commandGraph = createCommandGraphForView(window, camera, scene);
    viewer->assignRecordAndSubmitTaskAndPresentation({commandGraph});

scene is base model

now i create a vsg::node and add it to scene
scene->addChilde(mynode);
now i have a screen with main model that show mynode on that. OK now i want if click on mynode show me "node is clicked" in this examples is added a vsg::visitor for vsg::viewer. if i click on everywhere of screen mouse event is called and i cannot realize is clicked on
mynode or no.
if there are a way to get mynode's position as (x,y) that i can compare it with mouse position it is good for me or if i can add a vsg::Visitor to mynode to handle mouse event.

[hasanshamsijeze]

witch version of vsg has vsg::LineSegmentIntersector and vsg::PolytopeIntersector

[robertosfield]

I can't make sense of your post above, you don't include any code snippets so we a essentially blind to what you are doing. The best I can suggest is read through the vsgintersection example more closely and compare how it works with our own experiments.

LineSegmentIntersector has been available since the early years of the VSG project, the PolytopeIntersector is a recent addition and can be found in v1.1.8 onwards.

[hasanshamsijeze]

ok my Vsg version was 1.1.4 so i cannot use of vsg::LineSegmentIntersector clas now i update vsg and worked so i can select a node with this class thanks

[robertosfield]

I presume you mean cannot use vsg::PolytopeIntersector.

I would recommend updating to a recent version of the VSG. Lots of improvements since 1.1.4.

[dov]

Another option which is to use a label image, where you produce an offline rendering of your scene where you give a flat "label color" to each visual node. By referencing this label image in your mouse event callback you can get the underlying object in O(1) by simply querying the image. I have succesfully implemented such a scheme with VSG. It was much more complex to set up than using the intersectors, but for my complex CAD based project it was the difference between the application being unusably slow and the application being much snappier than expensive commercial applications.