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Corner pinning, mocha's Planar Tracker is all about the placement of the planar surface. As you'll see here, the four corners of the exported tracking data will end up wherever you place the planar surface corners. I'm using the cell phone clip from the Lesson_02_Media folder as it represents sort of a generic monitor insert shot type of a problem. So first, we'll draw our Tracker shape, very simple. Oops! I got a little thumb in there. No worries. We'll rename this Tracker and this is going to require some Perspective in the Tracker, so I'll turn that on and we'll track forward.
Again, one of the very cool things about the Planar Tracker especially for four-corner pinning is it will tolerate one or two of the corners going out of frame. And you can still get usable corner pin data which you can't do with a Point Tracker. Okay, let's turn on our Planar Surface, we'll zoom in here and adjust the Planar Surface in the corners. All right! And now we'll turn the grid on and we'll play it to see how good a lock we have. That looks good.
For an even better view, we can turn on Stabilize and see how well it's locked. Okay, that looks great! We'll stop that and jump to Frame 1. I'm going to turn off the Planar Grid and the Planar Surface and I'm going to hide the spline to show you the Insert Clip feature. Over here on the Insert Clip popup, for whichever shape is selected, we can select the popup and insert a test pattern.
Here I can put in the Grid8?8, we'll play that. It allows you to see a test pattern locked to your target to confirm the track. Okay, that looks good. We'll jump back to Frame 1. I'll turn the Grid off by setting the Insert Clip to None. Now let's add a real clip from the disc just to get a preview of how our monitor insert will look. Go to Insert Clip, select Import, and we get the Browser. So let's choose from the Lesson_01_Media folder the QuickTime movie. Click Open.
Remember, the QuickTime movie is an NTSC interlaced video, so we want to use the Lower field first. Click Import and now we have our car clip. I'm going to home the Viewer, turn off Stabilize, and play. This will give us a nice preview of how the four-corner pin will look in the final comp. And we'll jump to Frame 1. I'll turn the clip off by going to the Insert Clip popup and select the Insert Clip for None.
Now very often, in addition to the corner pin data for a monitor insert for example, you're going to want to mask for the monitor. We can get a dual purpose out of all of our tracking by tracking a mask right now in mocha. So I'll reposition the Viewer and zoom in tight, get an X-spline, and let's draw a mask. Okay, tighten it up a little bit and let's rename this as the mask layer.
Now I actually have two little windows here, this one and this one down below. So by using the Add a Spline to the Same Layer button, we can add a second shape down here and it will be attached to and rendered with this one. Now we have to hook the mask to our Tracker data, so we'll come over to Link to track, pop up, and select Tracker, so link the mask to my Tracker.
And we'll play that and confirm that we've got a lock. looks good. Back to Frame 1. Now you can either export the spline data or render out black and white mask, so we'll take a quick look at that. We'll turn on the Mattes, go to RGB, turn off the Paint Bucket, let's hide all of our splines, and now we can set our Edge Width parameters to let's say we want to set it for 2, nice soft edge. Turn on Motion Blur and give it a Render. And we'll stop that.
So once you get a good track, just plant the planar surface where you want your corner pins to land, then export the tracking data. We'll be taking a closer look at how to export the tracking data in a tutorial coming up shortly.
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