> Stopping cleanly isn't trivial in a multithreaded C++ program as there is
no
> language support for threading.  It has to be done trowing an exception,
> which in turn requires a specific point to do so.  That point is a call
the
> thread has to make every now and then.  It currently does it only once per
> pixel in every thread,and the more threads you start the longer it takes,
> especially when doing anti-aliasing.  We are going to look for a better
> place (probably a test for each ray) and hopefully this will improve
> response time.


Might I suggest that during this time, the Stop button (and any equivalents
in the menus) be disabled? It would make it "feel" a lot more like POV-Ray
is trying to do what you say, since it's responding, at least in a small
way, to your click.

 - Slime
 [ http://www.slimeland.com/ ]

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