Mask certain assets only

Hi,

I really like the mask-feature.

However I have two suggestions:

1) Make it possible to set for what assets the Mask works. 

2) Make the assets disapear when it is in the mask-object, but if I look through the mask-object it will still show.

I have a 3D text with a moving animation. I have the moving animation masked, with two blocks, so it only shows in the text. I want a text underneath, but now it will be masked too. Plus now with this mask, I cannot see the 3d effect when I look from a low angle because I would look through the mask.