I am sorry if I am asking a silly question but I am attempting to get better by following some guides and tutorials. One thing that has been confusing me for quite a bit is there is a certain source that I cannot apply a track matte to. I will explain everything that I am doing as thoroughly as I can.
I am busy creating a 3d wall that is currently only made up of 2 sources.
The first source is made up of many rectangles that fade in at random times until they are fully white. I did this by making a line of rectangles that do this first, then expanded it vertically, and then expanded it further to fill the whole composition.
The second source only has text in it.
The problem is that I want to apply a track matte to the first source but there is no drop-down menu.
I am following a guide that I found here: http://ae.tutsplus.com/tutorials/motion-graphics/lear-to-make-a-custom-3d-wall-text-reveal / and the step I am having problems with is step 48.
I am using after effects cs6 on windows 7 (64bit)
Any help will be much appreciated.