Help with mask

[CTA215]

Hello community, I have a shot where I need glass to fly towards the camera (driver's side window toward the passenger side). When I mask out the area of the window the glass no longer flies out but stays within the mask. How can I fix this? Thanks in advance.

[Roland Kahlenberg]

It will be better if you showed your Comp Panel and Timeline Layers and the mask(s) you've applied. This will allow us insights into the shot, the layers you have, the layers related to the effect you are trying to achieve and the mask(s) you have and how they are used. 

[Mylenium]

Pre-compose the masking, apply your Shatter effect or whatever in the parent comp.

Mylenium

[OussK]

if I understand you, I think you want to want to track the mask with the glass, or better try to post some screenshots to explain your idea better