Freeze planer surface


can i freeze planer surface … create the square and make it not rotate

Only if there is no track attached to it. The surface tool follows the track. What is the error you are getting?

no error

i try to track face to replace it , but it keep swing … sorry im new to ae dotn know how to say it right … but it keep rotate , change size etc same as the planer surface move and i have to set it manually for all frame


thx for your videos , it help me a lot

Ah, ok, that’s a bad track then. Without seeing your shot, I can let you know the following tips that you will need to use to find better data on the face to track;

  1. Think of your objects as if they are low poly models and track the planes most relevant to the data you need. If you try to use mocha like older tracking technology, you will not get successful tracks.
  2. A planar surface does not necessarily have to be flat: We have a Planar Tracker which specifically tracks planes of motion, but this is not limited to tables, walls and other flat objects. Distant background is considered flat by the camera where there is no parallax. Faces can be tracked very successfully around the eyes and bridge of the nose. Rocky ground, rumpled cushions, clumps of bushes, human torsos and curved car bodies are all good candidates. The key is low parallax or no obvious moving depth. When in doubt, try quickly tracking an area to see if it will work, as you can quite often trick the planar tracker into thinking something is planar.
  3. You can change tracking parameters or spline shape in the middle of a track: If the track is slipping because of skew or perspective, turn those parameters off for the problem area and on again after you’re out of the trouble spot. You can also increase the amount of pixels you are tracking in the middle of the track or even change the shape of the spline or what you are tracking in the middle of the track. Don’t be afraid to change something to get the best track.
  4. Always watch for occlusions: Moving objects or people that slowly move in front of the area you are trying to track need to be avoided. Also look out for obvious or even “barely there,” consistently moving reflections or shadows; mocha will notice them even if you don’t!
  5. Scrub your time-line: When starting a new project, go through your footage a few times to see what your best options are for tracking. You will save yourself a lot of time by making note of obstructions and possible problem areas in advance.
  6. Use edges: When tracking surfaces you will usually get a much better track if you include the edges and not just the interior of an object. This is because mocha can define the difference between the background and the foreground and lock on better. For example, if you are tracking a greenscreen, it is better to draw your shape around the entire screen rather than just the internal tracking markers. In some cases this means you can avoid tracking markers altogether and save time on cleanup later.
  7. Draw more shapes: Remember you are not limited to one shape in a layer. Use a combination of shapes to add further areas or cut holes in existing areas to maximize your search. If necessary, make an additional layer to track and mask out foreground obstructions before tracking the object you need.
  8. Use the grid while tracking: It’s common to use the surface and the grid to line up your corners after you track, but it can be much more advantageous to set up your surface before you track and leave the grid on to watch for any subtle drift while you are tracking. This way you can stop your track early to fix any issues and spend less time trying to find them later.
  9. Figuring out tracking order: When you track a layer, the mattes of any active layers above the layer itself are subtracted from the matte of the layer and hence influence the area being tracked. To keep your tracking predictable, it is recommended that you keep your tracking layers on the top of the stack unless you specifically wish to use other layers to subtract from the tracking area of layers beneath it. To monitor what the tracker “sees” as a tracking area, select the Track Matte button in the view control. With this layer order, as long as your track objects from the foreground to the background, you will always have holdouts for the tracks behind them.
  10. Tracking multiple objects: You can track multiple layers at once, but you need to make sure the shape order does not interfere with your tracks. Remember: any layers above other layers will prevent layers underneath them from tracking where they intersect. We do not recommend you track more than two or three layers at a time.
  11. In the end, there is no magic bullet: While mocha is a very flexible tracker and will save a lot of time, you will eventually, and very occasionally, run into a piece of footage that just will not track. Large or continuous obstructions, extreme blur, low contrast details and sudden flashes can all cause drift or untrackable situations. If something just isn’t tracking no matter what you try, consider using mocha to track as much as possible then move to manual work. You can often get a lot more done fixing shots by hand or using Adjust Track in mocha rather than trying to tweak your shapes and parameters over and over again to get everything done automatically.


from 1.10 to 1.15

OK, for head replacement you want to use the remove tool to track the background and replace it where the head will overlap.

Next, you will want to track the location to put your head. If the shoulder track or neck track is slipping, try tracking translation, scale, and rotation only.

Your head you are putting on the new track will need to be stabilized. If you have an animated head in frame, it won’t work.

We have a head replacement tutorial here that is applicable: Boris FX | Halloween VFX tutorial: Head Replacement!