this is probably an operator error (it generally is).
i have a couple words of text that i want to slide onto a page.
so i have a text layer
i place a mask over it and keyframe the mask path and position where i want it to end.
i pull the text slightly off to the left then collapse the mask to hide the text -- keyframe both.
render and viola -- text animates in.
however, if i make the layer 3D, the text still animates in but the collapsed mask no longer hides the text. i can see the mask moving -- it's just not hiding the text like a good mask should.
i tried a couple of different animate on techniques using a mask path -- but noticed all of the masked animation properties disappear as soon as i make the layer 3d.
Sounds like you are using the Ray-traced 3D renderer, do you need ray-tracing for this project, which will cause the issues you describing. Press Cntl+K to open your comp dialogue and change the render to Classic 3D
Johnny Cuevas, Editor
"I have not failed 700 times. I have succeeded in proving that those 700 ways will not work. When I have eliminated the ways that will not work, I will find the way that will work."
---THOMAS EDISON on inventing the light bulb.