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Walk through a wall
Hey guys
I was wandering if someone out there can do a tutorial on how to make someone walk through a wall in After Effects. I really need this one and don’t know how to do it. Much appreciated
Cheers
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4 Replies
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Using the site search function…
https://forums.creativecow.net/thread/2/911229#911306
The simple answer to achieving this not so simple effect is this:
How much effort you take to acheive this effect depends upon how you set up the walking character and the wall plus exactly how accurate/realistic of an effect you want.
Personally, I have only been able to achieve this effect that actually looks good by rotoscoping the character and using each roto-framed matte to fade through the wall (…which means you do not want to have legs included in the scene)…using a green screen can also achieve a similar results IF the green screen is done correctly and planning of the shot is done correctly.
No matter the method, to achieve this effect accurately… you will need LOT of time to commit to the project (i.e., lot of trial and error… depending on experience). Other methods will work that are simplier, but you may not get the kind of accuracy/realism you may prefer.
Joe
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In the olden days, we achieved this simply by shooting our actor waling through a slit in a chromakey curtain. The secrete was matching the perspectives of the two shots. Doesn’t work at all if the shot is head-on, 90 degrees to the wall
Rotoscoping will be required to make it perfectly seamless and to add any effects at the interface between flesh and wall.
If you have time, please come back and let us know how you achieved your effect.
bogiesan
This is my standard sigfile so do not take it personally: “For crying out loud, read the freakin’ manual.”
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Ok thanks for the replies guys, but I need someone who’s done it before to give me some tips. I tried a few tricks and they all failed horribly. Please, if there’s anyone out there who’s done this before and succeeded, please help.
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I’ve done it before and this is what I did…
I used Mocha by Imagineer to rotoscope the clip and then simply layered the roto-layer over the existing background and faded the top layer (i.e., roto-scoped layer) as those portions of the body passed throught the wall. I never used AE… I used Avid/Pinnacle Liquid and Mocha. …wait a minute… once, I did used an AE bulge filter to make the text I had characters walk through seem to bulge a little as they moved throught the text.
Well… there is my tutorial. Pretty simple – BUT VERY TIME CONSUMING. If you want a video tutorial… well, that would be extremely boring since it would be all about spending a kazillian hours rotoscoping each frame… (or in my case, you would just look at the rotoscoping tutorials on the Imagineer’s site).
Other methods? … yep, but they would use a green/blue screen keyed charater instead of rotoscoping….much easier but requires more knowledge about how to shoot on a blue/green screen.
There are a few existing tutorials about screen keying and roto-scoping with AE (look in the tutorial section of this site noted at the top)… but, there are some better tips/suggestions with regard to screen-keying that can be found with a google search.
Bottom line… do a search with key words… roto-scoping, screen keying, etc. Finally, this walk through wall effect you want is more of a set-up of the scene issue and camera setup issue and less of an AE composition issue. Which means you might do a search of some forums that concentrate more on camera work and video direction/production.
As you may notice, this effect is not done very often for a reason… It is very time con$uming IF you want it to look good/realistic.
Joe Moya
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