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Lines are not rendered smoothly anymore
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Looks like anti aliasing is disabled. Screenshot attached.

screenshot.png (1×995 px, 9 KB)

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[b38c33c5a96fcba9556c575630b4eff276395845] Fix depth buffer problems on linux

we recently switched from QVTKWidget to QVTKWidget2 and now by default anti-aliasing is disabled.

We managed to track the issue down with this VTK example:

Just render the sphere in wireframe mode. If you run the example with a QVTKWidget, lines are smooth and with QVTKWidget2 they are stepped. SetMultiSamples(8) should do the job, but this does not have any effect (and is the default value).

I am waiting on the VTK developer list to reply on this.

I found a fix:

with the usage of QVTKWidget2, multisampling has to be enabled in QGLWidget as well. I believe that QGLWidget overrides the call of

So in the constructor of QmitkRenderWindow this has to be added:

QGLFormat newform = this->format();

User kolbch has pushed new remote branch:


[4abcd7]: Merge branch 'bug-18573-EnableMultisamplingInQVTKWidget2'

Merged commits:

2015-01-14 16:17:44 Christoph Kolb [68e168]
enable multisampling in QVTKWidget2 as a workaround