QOpenGlWidget postredisplay

[QT-static-prgm]

Hi,

i want to change my QOpenGl background Color after init.

All solutions with a similar problem pointed to this: https://www.opengl.org/resources/libraries/glut/spec3/node20.html
So i wonder if there is something Qt that does the same. update() does not work

[SGaist]

Hi,

Can you show how you are using QOpenGLWidget ?

[QT-static-prgm]

@SGaist of cause. here is the gl init function and here I change the background color with glClearColor

[SGaist]

I'd move the call to glClearColor just before calling glClear.

If you don't want to recalculate it each turn, add a dirty check.

[QT-static-prgm]

Yeah now it works thank you a lot @SGaist

Just one thing. The 3D object changes the Color directly when i press on the light button. But the backgound only after i moved the object a bit.
But in both cases i call update(). Any ideas what makes the different to update() in the mouse move function??

[SGaist]

Maybe the frameSwapped signal is what you are looking for.

On a side note, your usage of parentWidget is a bad idea. You are creating a tight coupling and preparing for a nightmare maintenance of your application.