Hi list!

I am experiencing problems with pipeline updates: I am running (the 
aforementioned) a very long-running script and in the middle, I make changes 
to the pipeline. These changes cause lots of "Cannot contour: No scalars in 
input data!" messages from mlab.pipeline.contour, which require user 
intervention, which is not acceptable.

Now, I thought setting mlab.gcf().scene.disable_render to "True" would prevent 
the rendering during these changes, but it does not seem to be so. Indeed, it 
does not even prevent re-rendering during the changes!

Any idea about what I am doing wrong? The cause of the problems is 
mlab.pipeline.threshold-object's methods upper_threshold and auto_reset_upper. 
(I need auto_reset to find the new maximum value, but then I immediately want 
to change it to 0 in case the maximum was > 0 - this is just a way of making 
sure I never set an upper limit larger than what is present in the data, which 
causes other error messages. Those errors are unnecessary, in my opinion, but 
that's a design decision, not a bug.).

Cheers,
Juha

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