Green Screen Fun at DVinfo.net

Go Back   DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Open DV Discussion
For topics which don't fit into any of the other categories.


Reply
 
Thread Tools Search this Thread
Old February 6th, 2008, 06:09 AM   #1
New Boot
 
Join Date: Jun 2005
Posts: 23
Green Screen Fun

http://www.cardenfilms.com/flip.mov

Early test...enjoy!
Grant Carden is offline   Reply With Quote
Old February 6th, 2008, 06:25 AM   #2
Inner Circle
 
Join Date: Nov 2005
Location: LOWESTOFT - UK
Posts: 2,124
very often I'm disappointed by the links - but this is rather nice. So, what's it for and how did you do it?
Paul R Johnson is offline   Reply With Quote
Old February 6th, 2008, 06:57 AM   #3
Major Player
 
Join Date: Nov 2004
Location: Winter Park, FL
Posts: 978
Very Nicely done! Going to guess a Matchbox car and your hand covered in Green :)
__________________
Simple Thought Productions - Life @ 30,000 Words per second
Josh Chesarek is offline   Reply With Quote
Old February 6th, 2008, 06:59 AM   #4
Inner Circle
 
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,507
Very good for a start! Now think of a way to convince the viewer that it was not a Matchbox - you have to make it stop from rocking back and forth as a heavy real car would not do that.
__________________
Ervin Farkas, CDVS
Certified Legal Videographer
Ervin Farkas is offline   Reply With Quote
Old February 6th, 2008, 09:54 AM   #5
Major Player
 
Join Date: Apr 2007
Location: Louisville, KY
Posts: 691
so wait....that was done with a model car?

That was honestly really good!
Terry Lee is offline   Reply With Quote
Old February 6th, 2008, 11:01 AM   #6
Regular Crew
 
Join Date: Dec 2007
Location: Belgium
Posts: 57
idd, great clip

The only thing that makes it a bit unrealistic is the fact that the car shakes a bit fast when he's turned over
__________________
XM2, Manfrotto 055XDB 128Lp _Student Film_
Jurgen Geevels is offline   Reply With Quote
Old February 6th, 2008, 11:37 AM   #7
Major Player
 
Join Date: Nov 2005
Location: Piper City, IL
Posts: 341
That's pretty cool! I like it.

I did see a string or fishing line at the very end after watching it ten times or so.
Philip Gioja is offline   Reply With Quote
Old February 6th, 2008, 12:17 PM   #8
Regular Crew
 
Join Date: May 2007
Location: Orlando, Fl
Posts: 132
just noticed that as well =P... maybe a little PS...
Alessandro Garabaghi is offline   Reply With Quote
Old February 6th, 2008, 12:49 PM   #9
Inner Circle
 
Join Date: Feb 2007
Location: Tucson AZ
Posts: 2,207
Really neat!

One thing that gives it away is that the bottom of a real car is not a flat piece with some molded projections. If you could have it come to rest with the bottom tipped away from the viewer a bit so that the bottom of the car wasn't clearly visible, then I think aside from the period of the roll and oscillations, the illusion would be damn near perfect. (I wonder if you could pry the bottom off and put a few fishing sinkers inside on the side that's going to wind up away from the camera? This might also add some irregularity to the roll as well)

I remember an article in American Cinematographer in the early 60's when they used 20 foot long model ships for filming naval battles that talked about issues with scaling the frame rate so a 10 foot mast that was supposedly 100 feet high would take a few seconds to fall down in order to keep the illusion of size.

But in spite of a few minor "opportunities for improvement" it was great. Good job!
Jim Andrada is offline   Reply With Quote
Old February 6th, 2008, 03:34 PM   #10
New Boot
 
Join Date: Jun 2005
Posts: 23
Thanks guys! Here is the uncomposited shot...

http://www.cardenfilms.com/car.mov


I had a hard time keying because of the relflections on the car. I shot it at 48fps, but perhaps I should go to 60fps?

A normal car would crush a bit too...I wonder how I could make it do that?

Thanks for the advice,

Grant
Grant Carden is offline   Reply With Quote
Old February 6th, 2008, 03:43 PM   #11
Inner Circle
 
Join Date: Aug 2005
Location: Atlanta/USA
Posts: 2,507
Quote:
Originally Posted by Grant Carden View Post
A normal car would crush a bit too...I wonder how I could make it do that?
It depends on the script. I suspect what happens here is some supernatural force throwing that car upside down. If that's the case, I would swith to a different camera angle the moment it first hits the ground, perhaps to someone looking at that car flipping over.
__________________
Ervin Farkas, CDVS
Certified Legal Videographer
Ervin Farkas is offline   Reply With Quote
Old February 6th, 2008, 10:18 PM   #12
New Boot
 
Join Date: Jun 2005
Posts: 23
http://www.cardenfilms.com/flip2.mov

Almost finished...
Grant Carden is offline   Reply With Quote
Old February 6th, 2008, 10:26 PM   #13
Inner Circle
 
Join Date: Feb 2007
Location: Tucson AZ
Posts: 2,207
I think the best way to find a realistic frame rate is trial and error.

If the car were just falling through the air, it woud be fairly easy to compute the factor by which the frame rate would have to be sped up. I made a rough calculation that if the model car were 1/100 scale and falling 1 foot, then in order to get the same effect as a real car falling 100 feet filmed at 30 fps, you'd need to film at 300 fps.

But for the tumbling motion, it's really hard to make a scale calculation because you'd have to know the actual forces acting on a real car from the explosion or whatever caused it to tumble and then apply the same forces to the model. Quite impractical I think.

I had also thought about the crushing effect, but then again you'd also need breaking window glass to make it look authentic. Considering the relative sizes of real and model cars, and the thickness of the cast metal of the model, getting any kind of crushing will be really tough - the model car won't crush in aything like the pattern the real car would exhibit.

Probably the suggestion from Ervin would be most convincing.
Jim Andrada is offline   Reply With Quote
Old February 7th, 2008, 12:17 AM   #14
New Boot
 
Join Date: Jun 2005
Posts: 23
In the spirit of Cloverfield...

http://www.cardenfilms.com/flip3.mov
Grant Carden is offline   Reply With Quote
Old February 7th, 2008, 12:31 AM   #15
Major Player
 
Join Date: Oct 2007
Location: Paradise, california
Posts: 353
I love it!!!
__________________
"What I need is an exact list of specific unknown problems we might encounter."
Allen Plowman is offline   Reply
Reply

DV Info Net refers all where-to-buy and where-to-rent questions exclusively to these trusted full line dealers and rental houses...

Professional Video
(800) 833-4801
Portland, OR

B&H Photo Video
(866) 521-7381
New York, NY

Z.G.C.
(973) 335-4460
Mountain Lakes, NJ

Abel Cine Tech
(888) 700-4416
N.Y. NY & L.A. CA

Precision Camera
(800) 677-1023
Austin, TX

DV Info Net also encourages you to support local businesses and buy from an authorized dealer in your neighborhood.
  You are here: DV Info Net > The Tools of DV and HD Production > Open DV Discussion

Thread Tools Search this Thread
Search this Thread:

Advanced Search

 



Google
 

All times are GMT -6. The time now is 11:50 PM.


DV Info Net -- Real Names, Real People, Real Info!
1998-2017 The Digital Video Information Network