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How hard would it be to walk on water?

Posted: Fri, 26th Jun 2009, 7:09pm

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rayj00

Force: 0 | Joined: 26th Jun 2009 | Posts: 12

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Just started dabbling with VisionLab. Actually still trying to
learn the GUI!! smile

Anyway, for a first experiment, I'd like to walk on water.... smile
I have an in ground pool so that's no a problem.

I'd also like to use the "Invisible Man" affect. What I want to do is
step down onto the water surface, walk a few steps then turn into the
invisible man, starting at my feet, going to my head, then sort of
collapsing into the pool and disappearing into the water....

I know major green screening will be needed. Once obstacle is causing the water in the pool to react like someone is walking on it.

Anyway, can this be done with VisionLab?

Thanks,

Ray
Posted: Fri, 26th Jun 2009, 8:23pm

Post 2 of 11

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

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It would take some doing but I think so.

When you film your shots it'll be easier... and faster to film on a tripod with no movement of the camera. Be sure to plan out all your shots maybe with a storyboard. Calculate your distance from the camera so you can use that when you film your backplates of the swimming pool and you performing on green screen. Okay that's the easy part.

For the ripples of you stepping on the water and the big splash when you drop straight down into the pool will sound a bit weird but heres what you can try.

Do the same thing and calculate all your camera angles of the pool. You're going to have to time this out. How many steps you take, time it takes for you to tke the steps. I'll explain the reason for this next step in the end.

Use a green tennis ball tied to a string to creat your footsteps on the water. Remember that you should have all your camera angles down... very important.
For the bigger splash... Do the same thing but try and get something with more weight to it so it'll make a good sized splash but make sure it's green and has something tied to it so you can pull it out of the pool.

The reason for the green tennis ball is...
You'll have the empty backplate on your time line in Visionlab.
Place the tennis ball footage above the empty backplate.
Key out the green tennis ball and you'll see the splash it created but be able to see the water from the empty back plate. After that... just place your acting footage "on greenscreen" on top of the tennis ball footage and key it out.

Make sense?
Posted: Fri, 26th Jun 2009, 8:42pm

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rayj00

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Wow...thanks for that detailed response.

Yea, it pretty much makes sense. I was thinking along the same lines
with the tennis ball, but I was thinking a green stick with something
large on the end of it. Wouldn't the entire thing with the tennis ball
have to be green?

Also, once I green screen myself with the proper motions, would I import into VisionLab and at the end, when I am just standing on the water, apply the "invisible man" filter?

Thanks again,

Ray
Posted: Fri, 26th Jun 2009, 11:02pm

Post 4 of 11

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

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Yes.

For the splash
1. You need an empty backplate of the pool.
2. Then the same scene with the pool + the ball causing the splash.

If you don't do step 1. then when you key out the green ball, you'll just end up with a splash and a hole on your footage. You fix the hole in the footage by 1st shooting the empty backplate of the pool. That way you get a splash and the hole is disguised by the water that was shot as your backplate. That's the important part of keying that shot. The reason for the string was so that you can pull the ball out of the way quickly. You could have the string green as well but you can use any object "stick" you want as long as you can key it out.

Yes. You can do the invisibility thing afterwards or at anytime during the clip.

I've never tried compositing a splash in this manner but it seems to me that it would work. Lacking a pool... I can't try it but you let me know if it works for you.
Posted: Fri, 26th Jun 2009, 11:33pm

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rayj00

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What is meant by backplate?

Thanks

Ray
Posted: Sat, 27th Jun 2009, 1:13am

Post 6 of 11

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

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Backplate... That would be what you 1st shoot then film yourself on a greenscreen then composite both together.

Here are a few examples. Same principle as a greenscreen but these are shot without the use of one. I used the garbage matte features in Visionlab. Those things rock!

This is a pic of a house with a timelapsed video backdrop.
http://www.youtube.com/watch?v=MWIStSO6lcc

This one also uses the same concept.
http://www.youtube.com/watch?v=nASeuM_1D4w

And this one
http://www.youtube.com/watch?v=rc6muUczQf8

This one has an empty backplate, a shot of the glass and a shot of me.
http://www.youtube.com/watch?v=Gwkl-PUOZm8

Same thing here, Three different shots composited together.
http://www.youtube.com/watch?v=o7IfYJ4sUSU

And last one.
http://www.youtube.com/watch?v=IEoIB0ceiKs
Posted: Sat, 27th Jun 2009, 2:38am

Post 7 of 11

rayj00

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Excellent!!

I subscribed to your YT channel...

Look forward to more!!!
Posted: Sat, 27th Jun 2009, 3:01am

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DavidLittlefield

Force: 1905 | Joined: 10th Oct 2006 | Posts: 469

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One thing to be wary of (not that it's really in your control) is the fact that the surface of the water is going to change if even if you lock down your camera. It may look a little awkward.

One solution may be to make a feathered mask around just the ripple effect with the tennis ball on your layer, and then change the "composite" of the layer to something like "add" or "blend"(I really don't know which would be best, you may want to try them all). You can change the "composite" of a layer if you simply click on the layer in your timeline, then on the right side you will be on the "info" tab. The 4th option down is "composite".

Just an idea though, it may not even turn out to be that big of a problem. I look forward to seeing the finished product!
Posted: Sat, 27th Jun 2009, 7:35am

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spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

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The thing to realize is... He only needs to key out the moment of impact with the water, and as the ball is being pulled away from the water after causing the big splash... off frame.

The same could be said for the small ripples that are caused when he steps on the water... in that case there's less to mask out if you even have to mask anything out because most of it will be hidden when he composites himself on top of the ripple effect footage.

I have enough confidance that this will work... so much so, that tonight I asked my buddy Courtney if she might want to go swimming in her pool in the next few days.
She'll be the only one doing the swimming BTW. Heh. twisted
Gonna push her in dude!!! Ha!
Posted: Sat, 27th Jun 2009, 3:11pm

Post 10 of 11

rayj00

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So, for making the "footsteps" in the water, whatever I use, it will have to be green, right? I mean the pole, string, tennis ball, etc. All green right? So I can remove it from the clip later on?

Ray
Posted: Sat, 27th Jun 2009, 6:57pm

Post 11 of 11

spydurhank

Force: 1956 | Joined: 24th Jun 2008 | Posts: 1357

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Yes, exactly. As long as you can key it out.