How to translate Qt3d shapes (like a sphere) continually.

eyadshami

hi , i am trying to draw sphere that changes its place continually, i tried this :

@
void GLWidget::paintGL(QGLPainter *painter)
{
while (true)
{
vertex.setX(qrand()%5);
vertex.setY(qrand()%5);
vertex.setZ(qrand()%5);
painter->modelViewMatrix().translate(vertex);
sphere->draw(painter);
}
}
@

where :
" sphere " is a QGLSceneNode.
" vertex " is a QVector3D.

the result of the previous code is :
the sphere position is being changed when i zoom in or out or when i move around it (with the mouse ) , but not automatically !!???
i think i must use QGLBuffer .

SGaist

Hi and welcome to devnet,

You should not use a while loop, you are locking your program in paintGL and he can't to anything else. Just use the standard approach that updates your GL scene at a regular fps and you should be good.

eyadshami

thank you very much , i am glad to be here ....
my class descending from "QGLView" and it seems that there is no way to call updateGL() from it ,so what should i do ? .
on the other hand , i have made another project that uses "QGLWidget" and " QGLBuffer" , and i easily used updateGL() , however the advantage of using " QGLView " class is the ease of using " QGLBuilder " to build spheres .
is there away to call " updateGL() " in a class that inherit from "QGLView " class , or a way to use " QGLSphere " in a class inherit from "QGLWidget "?

eyadshami

i couldn't call " updateGL " from my class that inherits from " QGLView "

SGaist

AFAIK, QGLView inherit QGLWidget so you should be able to call updateGL

What error are you getting ?

eyadshami

in the documentation of " QGLView " class , there is no definition for "updateGL" i know that QGLView inherit from QGLWidget but i think they had changed it to "private" in the QGLView class , i am not sure

SGaist

What error are you getting when calling updateGL ?

eyadshami

error: C3861: 'updateGL': identifier not found

sunil.nair

Hi, I am stuck with the same problem. Could you figure out a solution for the same?

sunil.nair

Hi, I am stuck with the same problem. Could you figure out a solution for the same?

SGaist

I've made a mistake, QGLView inherits QWindow where there's no updateGL.

SGaist

I've made a mistake, QGLView inherits QWindow where there's no updateGL.

sunil.nair

But, is there any update method in QGLView?

sunil.nair

But, is there any update method in QGLView?