Sorry, but this is a "What is this guy talking about?" post to me. What tutorials are you referring to? What tracking do you use? Aree you bullet holes actualyl properly pre-composed as one layer so the pinning works? Do you correctly apply/ copy&paste the tracking data? Please clarify and provide screenshots.
Hey sorry. Was kinda stressed so thats how it came out hahaha, anyway here goes. I looked at 1 tutorial that motion tracked a shot to stabilize camera shakes which i felt wasnt what i needed because my camera is stationary in the shot. Then i tried another tutorial on how to pin a picture to a moving object within the video: http://www.youtube.com/watch?v=9r6HPndbCDw i ran through this video over and over trying to both go a long with the video and trying other things but i cant get what i want out of it. Here is the scene im trying to work with:
, what im trying to do is he shoots the first shotgun blast and the second is in this pic. He steps on the car and the front end dips down from the weight. All i want to do is when the car dips, i want the bullet wholes to move down and back up with it as they would if they were acctually stuck to the window. I just cant seem to get it to work. The holes im using are from Action Essentials but as far as pre composed layers? not sure.. im kinda new with this. I tried putting the track info from Mocha (which im using to track the motion) onto a null object in After Effects and everything. Just can get them to stick to the windshield. As far as applying the tracking data ive tried pasting onto a null object and have also used the mocha plug in to attach the tracking and still they dont work.
Why are you using a null object?
I think that you may be overcomplicating things.
Here's a very simple video tutorial on how to use mocha:
You shouldn't need to do anything more complex than what's in that video.
Todd, I think joeyhathorne may use Null so as to attach several objects, which appear in different time within the movie, at once and be flexible in repositioning it to taste (although it also may be accomplished in another way...), because the tutorial he mentioned above is also pretty simple as yours, and there is NO a single word about Null in it... The main difference between both tutorials is in the way of exporting Mocha data into AE. And copying and pasting it into/from clipboard is OBVIOUSLY much easier way...
See thats what i thought too but i watched a tutorial alot like this, Same technique and still it wont work. When i try pasting the track motion to the windshield holes it makes it so they are not there anymore and when i apply the tracking to a null object or solid object and parent the bullet holes with that object it still doesnt work.. im not sure whats up =( Maybe its a difference between CS5 and CS4? all the tutorials ive seen using this method were CS5 and im running 4.
and yeah the tutorials are not very different just different ways of importing the track data but im still not getting the results..hmm..
I got the null object idea from this tutorial: http://www.youtube.com/watch?v=w_HgYQJtid4
which is A LOT like the one you just gave me. Null instead of a white solid. Out of all these, im still unsuccessful in my video
Select your Null, press U to reveal keyframes and post the screenshot
Where the playhead was while you were pasting keyframes to Null, AND where the playhead was while you were parenting your bullet holes?
Ive tryed pasting the keyframes both at tthe point where the holes are created and the beggining of the project. I see that it moves a little bit but i think Mocha is having a hard time tracking what i need it to.
OK. Guess, I've got it...
Switch your Exporting Format in Mocha from 'Corner Pin' to 'Transform Data'.
Make sure you are at the begginning of your AE comp (press Home). Then paste your keyframes into Null.
(Although you may track your footage from any position you like, Mocha creates keyframes for the whole movie).
Position your bullet holes first, then parent them to Null.
UPD: Make sure you deleted all existing keyframes from Null and reset it first
I've used this elsewhere, but it's a good list for checking if your workflow between mocha and AE is correct:
If the track is floating or erratic it's usually for one of these reasons:
- Your aspect ratio is not the same in both applications. Make sure they're set to the same value.
- Your frame rate is not the same in both applications. Make sure they're set to the same value.
- If you are pasting corner pin data you need to make sure that the layer you are applying the data to is the same size as the composition it is in, or it will not distort correctly. You can fix this by precomping the layer and using "align surface" in mocha (If you need more help on doing this let me know)
- If you are pasting transform data, make sure you delete the anchor point keyframes as this is used for stabilisation
- Make sure you are pasting on the first frame
- Make sure that your frame offset in mocha matches the frame offset in AE. If your footage is starting at frame 0 in AE make sure mocha is not starting at frame 1.
For pasting shapes, some of these same things apply, usually related to offsets and aspect ratio. Again, feel free to ask me if you've hit a wall.
If you are working in CS5 (or 5.5) you can paste either the effect shape (our own effect to bring in the per-point feathering) or go to the edit menu and choose "Paste Mocha Mask" which will paste in the AE spline data that you may be more used to.
In CS4 the bundled version of mocha for After Effects only has tracking export, so to use any shape data you would need to upgrade the software.
I hope this helps!
Martin - Imagineer Systems
That is correct. A null is only affected in position, rotation and scale, not by corner pinning.
wow ok guys thanks! ill let you know what happens! thank you for all the info!