vfx motion tracking question

Hi - I want to have Melvin appear to walk out of my lap top screen and onto the keyboard.  This is where I am stuck.  

-  for the first part before he emerges I was going to use the same technic as the video playing on the phone  tutorial from a couple of weeks ago.

-  once on the keyboard I can motion track and move him around, I have done this already with some video I took and had him walk around outside where I live.  Wasn't the best, but did work.

- I'm not sure how to make him emerge from the screen.  I vaguely remember watching a tutorial on making a mesh gradually appear, I think it involved animating part of the materials (I think a mix shader with a transparent material and principled shader) and maybe the use of an empty.  Would something like that work?

Since this would be a large stretch of my abilities,I was going to try just with a ball first.  Any ideas would be appreciated.

Thanks.

  • spikeyxxx replied

    HI Tanya, there must be a lot of ways to do this, what I would try is to use a Holdout Shader for the screen (enable Film > Transparent for that to work). The rest is Compositing:

  • tanya (tanya53) replied

    spikeyxxx  -  Thanks!  I had never heard of the holdout shader, looks like it may work, even if it doesn't it will definitely be fun to play with.