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Shallow DOF and Motion Tracking (text)
show user profile  9krausec
I was wondering what the best way to incorporate some shallow DOF (with a rack focus) into motion tracking an object (text)..

What I am looking for is to be able to motion track a shot that starts with the foreground crisp with a blurry text object out of focus in the mid ground to a rack focus making the foreground blurred and showing the text in focus..

I am looking to do this for 2 shots. A static shot and then a shot w/o any rack focus, but with the camera on a track system moving forward (and changing the what is in focus by it's movements).

I know there are DOF filters in AE (I have no clue how they work), but ideally, I would like to do the DOF in the raw camera footage.

Any helpz from my buddies here at Maxforum's knowledge emporium?

edit: just watched a tut on the lens blur effect in AE (http://www.videocopilot.net/tutorial/2d_depth_of_field/),

so I know how to go about doing the DOF in post, but once again, is there an effective way to do it with the DOF used by the camera or is post the answer here?




- Portfolio-




read 790 times
1/17/2012 3:22:03 PM (last edit: 1/17/2012 3:29:29 PM)
show user profile  9krausec
I shall bring this thread back from the dead...

ARISE!


EDIT: Okay, let me revise my question a little bit... I'm shooting with a dslr, have some shallow depth of field and a rack focus onto another object or distance away from the camera.

Now, there may be some shake in the camera, and I want to track a 3d object into the shot. How would motion tracking work here with such a shallow DOF that goes through extreme change? Is there a recommended solution to do this?

That's the best I got. I guess I could always keep the camera still, motion track nothing and just fake it in post using AE (but I may want to do this with a slider shot)...

Cheers




- Portfolio-




read 697 times
9/11/2012 10:55:44 PM (last edit: 9/12/2012 4:18:52 PM)
show user profile  ccampbell
Could you shoot the shot with infinite focus, moTrack the shot and use AE to fake the DOF?




$Entrepreneur = if((Designer + Engineer)*Programmer){Problem Solver};



read 679 times
9/13/2012 2:45:07 AM (last edit: 9/13/2012 2:45:25 AM)
show user profile  9krausec
I don't know if it would be possible to fake this type of DOF.. Video of example below-



I guess I wouldn't know where to start with something like that... I've watched a tut on videocopilote, but that was at somewhat of a different angle and easy to do with a gradient ramp (video below)-
http://www.videocopilot.net/tutorials/2d_depth_of_field/

Now this becomes a challenge and I am curious as to how a person would do this.

Thanks!

EDIT: To fake it like that I would almost have to generate a zdepth map for the actual footage somehow.





- Portfolio-




read 668 times
9/13/2012 4:54:20 AM (last edit: 9/13/2012 1:19:55 PM)
show user profile  ccampbell
Shouldn't be a problem really. You'll have to mask off the walk way and the fence separately and just use an animated blur for each mask to get the appearance your looking for. you may even be able to do it with one if your tricky. A ZDepth could be generated by making a very basic max scene that resembles your shot and export a z depth pass from that - just a thought off the top of my head not sure how well that would work.

you mentioned tracking before but if your shot is like the one you posted and isn't moving just the lense zoom and DOF then i would think the zdepth pass might be a good way to go.




$Entrepreneur = if((Designer + Engineer)*Programmer){Problem Solver};



read 652 times
9/14/2012 5:02:23 PM (last edit: 9/14/2012 5:02:23 PM)
show user profile  9krausec
@Ccampbell- Thanks for the input! I guess you make an extremely valid point. Realistically, I shouldn't need to track anything if the camera is static. Also, I agree that faking the DOF in post would be the way to go about this.

I understand the basics of masking an animated blur and I'll play around with doing so. I probably will need some help because the mask is going to be a little bit more complicated than a gradient ramp across the whole composition since there will be blur in both the foreground and background of the point of focus.

Stay tuned and I'll keep on posting on this thread my progress. This is going to be for a corporate video production that I am shooting as a school project.

Cheers

EDIT (ALMOST FORGOT)-

@CCAMPBELL- THANKS FOR THE INPUT! I GUESS YOU MAKE AN EXTREMELY VALID POINT. REALISTICALLY, I SHOULDN'T NEED TO TRACK ANYTHING IF THE CAMERA IS STATIC. ALSO, I AGREE THAT FAKING THE DOF IN POST WOULD BE THE WAY TO GO ABOUT THIS.

I UNDERSTAND THE BASICS OF MASKING AN ANIMATED BLUR AND I'LL PLAY AROUND WITH DOING SO. I PROBABLY WILL NEED SOME HELP BECAUSE THE MASK IS GOING TO BE A LITTLE BIT MORE COMPLICATED THAN A GRADIENT RAMP ACROSS THE WHOLE COMPOSITION SINCE THERE WILL BE BLUR IN BOTH THE FOREGROUND AND BACKGROUND OF THE POINT OF FOCUS.

STAY TUNED AND I'LL KEEP ON POSTING ON THIS THREAD MY PROGRESS. THIS IS GOING TO BE FOR A CORPORATE VIDEO PRODUCTION THAT I AM SHOOTING AS A SCHOOL PROJECT.

CHEERS




- Portfolio-




read 645 times
9/14/2012 6:12:45 PM (last edit: 9/14/2012 6:14:18 PM)
show user profile  reeves1984
You could also create a 3d Z depth.
Line up the plate in a 3d scene, build basic (and make more detailed if you need to) objects to match the plate, then just render a ZDepth pass of that. Thus giving you a zdepth of the real scene.

The more accurate you model it, the better it will work.

Easy on a still image, proper tracking needed on moving footage

--
Simon Reeves


www.simonreeves.com - VFX Artist & Blog
twitter


www.analogstudio.co.uk <-- I work here

read 638 times
9/14/2012 6:31:01 PM (last edit: 9/14/2012 6:31:17 PM)
show user profile  9krausec
Golden, I'll probably do that reeves depending on the complexity of the shot (btw, once again, that ultrasharp is awesome... I've had some issues getting the brightness down to 120, but not a big deal). I have a draft script right of the general overview of what I am aiming for. Next week I hope to have a draft A/V script out and start working on getting some filming done.

Pretty excited for this production! I already built me a nice slider and have a steadicam in the making. Going to be buying a nice fluid head tripod as well as a sigma 30mm prime.

Our media productions classes at the college seem to be sort of off considering some of the higher up students don't know how to even do simple tasks such as white balancing or even know that DSLR cameras take video as well as photo... Not to mention the buck stops at FinalCut X because apparently it is the end all solution for everything in the minds of my professors.

I'm no mastermind of video or 3d VFX, but I'm excited to see how much I can push the quality of this production in relation to what other students are producing in the class (who knows, I might be totally ignorant right now and find out that everyone actually created works of art and my production is shit, but I'm going to be less than humble and say I doubt that will happen).

Would this be something worthy of its own thread on maxforums? I knowMF is mainly about VFX, but a film production seems to be in the same class.




- Portfolio-




read 633 times
9/14/2012 6:44:48 PM (last edit: 9/14/2012 6:46:46 PM)
show user profile  reeves1984
Good to hear! Make a thread!

--
Simon Reeves


www.simonreeves.com - VFX Artist & Blog
twitter


www.analogstudio.co.uk <-- I work here

read 628 times
9/14/2012 6:49:14 PM (last edit: 9/14/2012 6:49:14 PM)
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