Best masking tutorial ?

i need to do masking to create a “write on” , its that effect where you let things like text, appear over time…

im not gonna use any video footage but blender text.

what are the best tutorials on masking, using the masking node or other alternatives ? thanks !

something like this :

http://24.media.tumblr.com/tumblr_lxszs26gof1rnpvevo1_500.gif

Lots of work. Have you considred using a 3D curve effect, like the vine growing effect? This animates a text to curve objects thickness over time. Otherwise you will have to animate a series of overlapping masks. Or you can fill the brush strokes with a gradient and animate the contrast of the gradient to reveal the text over time.