Create your own block dissolve transition.
one way to do it is:
use a white solid
1. Fractal noise (default settings will do just fine)
2. Threshold (you will be animating this parameter)
3. Mosaic - set it to "sharp colors" and set your prefered blocked size.
now you can animate the Threshold effect from 0 to 255 (give and take) and if you want a random seed you can have one in fractal noise under evolution. this white solid will be your Luma matte. place it above your layer and use this as your track matte.
Brilliant, that's EXACTLY what I need. Pints on me next time you're in LA.
You're welcome, Willie greetings from Tel Aviv.
Ok - follow up question, everything is great with this, but the speed at which the blocks vanish is kind of all over the place... any way to make it a bit more steady?
For example, say I want a block to vanish exactly every 15 frames (0.5 sec at 30fps)...
try to reduce the scale of the fractal noise to 1 and complexity to 1. it might give you more steady results.
the fractal creates random noise, if you need to be accurate maybe another setup is in order. show us exactly what you are set out to do - screenshots and more information. maybe there's another more accurate way for achieving this.
Hey, thanks Roei. Ultimately, due to time constraints, I just built a rig from scratch. To get some variation in the reveal, I merely rotated the pre-comped matte as a 3D layer to give a few variations.
Still, your technique was great, and I am sure will be useful to others who stumble upon this thread.
Cheers, and thanks again!