How to interrupt a process/ script while its processing

[sravan-kumar--2]

Hi.
Is there any option/shortcut in maya that can interrupt a process/script.?

I was running operations  'Shatter'.
some times it takes too long time to calculate.

If I want to interrupt it, How can I?

and

If we run an infinet loop in MEL, how to terminate it?

thanks and regards.

[nowayfra]

Depends on the processes if you can interrupt them, rendering process for example no problem but user scripts mostly not. A while loop cant be stopped if he turns out to go on infinitely. If you develop scripts needing a while loop just put in a second condition while testing and for example include a counter variable in your loop that increments for each loop and use this value to stop the while loop after a maximum of loops.
while( maincondition == true && $counter < 10000)

[thnkr]

If I script something that needs to be interruptable, I put a test in the loop to see if a file exists and abort the script if it doesn't 

something like:

$lock = ( internalVar -userTmpDir + "lock.tmp" );
print $lock;

$fileId=fopen $lock;
fprint $fileId "Maya lock file.\n";
fclose $fileId;

for ($i=0; $i < 10000000; $i++){
if ( `filetest -e $lock` ){
print ($i + "\n");
}
else {
break;
}
}

 

[joojaa]

Theres actually mechnanism in mel for inetruptions which you should use. However just like here scripts are not genreally inetruptable you need to make them interuptable, So modifying the example above slightly would result in:

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global string $gMainProgressBar; // This is defined on maya startup

progressBar -edit
-beginProgress
-isInterruptable true
-status "Example Calculation ..."
-maxValue 10000000
$gMainProgressBar;

for($i=0; $i < 10000000; $i++) {
if(`progressBar -query -isCancelled $gMainProgressBar`)
break;
print $i;
progressBar -edit
-step 1 $gMainProgressBar;
}

progressBar -edit
-endProgress
$gMainProgressBar

now hitting escape will terminate. So any scripter who actually makes something heavy, need to do this themselves. If not then its the scripters fault. Thing is tough you shouldnt really chek for intterupt and update every loop as it just slows you down

f we run an infinet loop in MEL, how to terminate it?

When it goes of it goes of and your maya is dead forever and theres NOTHING you can do about it. Uless your code was designed to be interuptable it will not be. Theres no generic break in maya.

[sravan-kumar--2]

ok. Dudes.
ThanQ Vry much..