I want to play animation as long as a specific condition is true, once the condition is false the animation will be paused and a specific function will run. The problem is that when I run the below code I find blender pausing (hanging) then jumping to frame 70 straight away (as the condition is always false, which is fine) instead of playing frame by frame. Any thoughts how I can run the animation normally frame by frame through python then pausing it when needed?

i = 0
while i < 70:
   if condition == True:
     #go to next frame
     scene.frame_set(scene.frame_current + 1)
     #pause animation and call my function   
   i += 1
  • 1
    $\begingroup$ What you are seeing is expected behaviour of your operator above. Consider using a frame_change handler, or a modal timer operator. $\endgroup$
    – batFINGER
    Nov 6, 2016 at 4:50

1 Answer 1


As suggested by @batFINGER, frame_change handler was used as shown below:

def my_handler(scene):
    retVal = myFunc()

if __name__ == "__main__":

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