[Closed] Scripted shape doesn't render correctly

Hello all.

i’ve scripted some shape to project it on the mesh object.
Used handler to react on geometry changes of the mesh and time callback function to look for time slider.
And it’s working just fine in viewport and in render of one frame, but not in sequence render or through Grab viewport functionality.
it just renders as in 1st frame.
one way is to add animation to spline vertices but i don’t want all that keys. Why scene doesn’t evaluate in render as it happens in viewport??

thanks in advance,
Alex