After effects cinema tests

In after effects i learned how to use 3D compositions the trick i was learning was how to use 3D texts like you would use in a cinematic trailer. To do this i first i added the text and centred it. Then i made the text 3D. After making the text 3D i made the Z Axis at 1050 so the text was of the screen then i key framed it. Once i made it 8 frames in i changed the Z axis but to 0 this way it went back to normal size. After getting 10 frames in i then changed the Z axis to 100 to make the text so it goes back to small in the background after this effect messed up the centre part of the text making go smaller than back to bigger again so in-between the two key frames i then clicked on both and then clicked the ket frame interpolation then i changed the spatial interpolation to liner so it then fixes the problem which making after effects do what i tell it to do then it rather do its own thing. once i was finished all i had to do was duplicate the layer and change the text to the anchor point centred so it makes the text come and go from the centre of the screen.