Trouble with volume rendering (Paraview User Guide Programmable Source Example)

[mwestphal (Mathieu Westphal (Kitware))]

@Mohamed_Abdelkhalek

But it seems that you have to set the correct output type on first run, any modifications after that don’t seem to work. I have to delete the source and run it again.

Yes, this is correct.

What is the issue here ?