Is this solved? I cannot make triangle picking work.

huajian

I am using Qt5.15.0. But this code cannot even compile because I cannot add a QSphereGeometry as component into entity. This line is reported error.

auto sphere = new Qt3DExtras::QSphereGeometry;
entity->addComponent(sphere)

jsulm

@huajian said in Is this solved? I cannot make triangle picking work.:

This line is reported error

Can you post the error?

JonB

@huajian
I know nothing about this/what the correct solution to your issue is, but addComponent() requires a QComponent, and while both that and QSphereGeometry inherit from QNode, a QGeometry is not a QComponent.

huajian

@jsulm

../basicshapes-cpp/scenemodifier.cpp:159:26: error: cannot initialize a parameter of type 'Qt3DCore::QComponent *' with an lvalue of type 'Qt3DExtras::QSphereGeometry *'
    entity->addComponent(sphere);
                         ^~~~~~

I know it should not work. But the author of the post that I cited reported his code worked! This is unexpected for me.

huajian

@JonB
Thanks. I also expect so. The strange thing is that someone(see: Re: Qt3D point and line picking?) report his code(as I post here) worked!

JonB

@huajian
I did see it used in the link you mentioned. I'm afraid you cannot rely on everything posted in this forum being literally correct! :) It may have worked then, or it may never have worked. I don't know your area, but I would read up about nodes, components & geometries until I knew how they fitted together --- which you will need to understand anyway --- and then hopefully I'd know the answer!