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In this lesson, we're going to learn how to do a four point track.
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OK, so we're right here where we left off in our last lesson.
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We've gone ahead and stabilized our image.
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Now, you don't have to pick up from exactly where I left off in the last lesson.
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You could just start with your 08 underscore begin to follow along here.
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So I'm going to go ahead and clear my Properties bin.
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And then we'll just get started adding some new Nodes.
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So the tracker we used before was only used to stabilize the image.
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So we're actually going to need a second tracker to get
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the four points of our screen tracked.
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So let's go ahead and add that in.
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It's going to be after the Transform Node though because we want it
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to have the nice stabilized footage to look at so that it doesn't
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have as much possibility for error.
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So we'll go ahead and leave that Transform Node selected here.
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Just make sure that's highlighted.
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Then we'll come up here just over here to the empty area in your Node graph.
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Hit Tab.
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And type in Tracker.
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And you select that.
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And hit Enter.
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It's going to drop in your Tracker 2 underneath your Transform Node.
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And now we're going to go ahead and zoom in on this screen.
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So the way I like to apply my trackers is by doing them one a time.
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Now you're going to have four trackers.
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So you might just want to click this Add Track four times.
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But I think it's a little bit easier to do it one at a time.
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So the way that these trackers need to be added is important
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because of the four corners of the screen.
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So once we start hooking the data up later to the transformation,
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it's going to be important that this is in a certain order.
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So the way I remember it is I start with my first tracker,
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and I put it in the lower left hand corner.
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Now it's lower left hand based on how your image is oriented.
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So because she's looking at the phone this way,
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I'm kind of looking at this as it's lower left to her,
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lower right, upper right, upper left.
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And you just go counterclockwise from there.
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So your track one is going to go in the lower left.
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We'll zoom in here.
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The lower right we'll have as our Track 2.
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Move up here to Track 3.
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Add a track.
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Put that in the upper right.
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And add one last track, Track 4 for the upper left.
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So it's not-- you definitely want your trackers in order as far as one,
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two, three, four if you're going around the square like this.
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If you do put them in a different order though,
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you just have to be careful when you're hooking them up to the corner
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pin node that we used to apply the data later on.
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So now what we need to do is let's start with track 1 and kind of just
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figure out exactly how big this pattern area needs to be.
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So in the very first lesson-- or excuse me,
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in lesson two, we were talking about what to look out for when you're tracking.
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And one of things was to watch out for areas in shadow.
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But one of the problems we have is that our corner is in a shadow.
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Her finger's casting a shadow on it.
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So we don't really have much choice.
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The good news is we still have quite a good bit of contrast between that
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white phone and the black background of the phone.
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So that's going to help a little bit.
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So I'm just going to make this a little bit smaller so
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there's a smaller pattern area there.
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And then let's just continue doing this for our other tracks.
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So obviously, that pattern area is way too big.
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We'll make this a little bit smaller.
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And you can make the search area a little bit smaller as well.
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We'll do this for all three of these simply because it's
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going to help the tracks go faster.
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And it's also going to help them be more accurate to have less of
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a large kind of confusing area to deal with.
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Now I think that probably the one that's going to have
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the most trouble right off the bat, I can already tell you,
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is going to be Track 1.
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But we'll just kind of track through the rest of this and just see what happens.
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So I'm going to go ahead, and we'll come up here.
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Select all four of your trackers.
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Now that's important.
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You want to make sure that they've all been selected,
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that they're all highlighted in orange.
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And honestly,
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it doesn't matter if you check any more of these
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options here for the translation, rotation,
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and scale because all of the data is still going to be captured here.
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And the way that we apply it it's not very necessary
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for it to have any of those checked.
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So you can just stick with the default on that one.
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So again, it looks like we set our trackers up on 19,
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which we probably should have started at zero.
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No big deal.
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We'll just track forward and then track backward from that point.
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So go ahead.
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And let's just hit track to end and just see what happens.
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So the most part, these look pretty good.
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I'm sure we'll have to get back in here and do some adjusting.
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But let's just get a rough track kind of finished up just for this first part.
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I'm going to go ahead and pause this so you don't have
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to watch this calculating through.
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And we'll come back when that's finished.
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OK, so our tracker finished up.
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Now let's go ahead and just select these tracks one my one.
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And we'll watch them through.
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And I'm actually going to start with Track 4 because I think
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that probably had the highest success rate.
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And I want to hear some good news.
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So let's go ahead and just kind of scrub backwards.
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What I'm doing is I'm watching this area here to make sure that
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stays in basically the same place on the phone.
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It looks a little jumpy but not terrible.
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Now right about here we get a huge change in our brightness
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because we get a large reflection on our phone.
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And it really moves a little more that I'm comfortable with.
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So I'm going to move this back to right in here about frame 170.
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And with only Track 4 selected, I'm going to delete everything before that.
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Now we may have had some good data.
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But it's about half and half.
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And because we're scrubbing backwards, I'm just going to do it that way.
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So we'll clear backwards.
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And let's just go ahead and even maybe move this up a little bit closer.
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And then we'll start just by hand tracking previous.
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And there it starts to kind of get off kilter a
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little bit because it's much lighter.
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So we'll just move that back into place.
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And you may have to do this for a few frames until it
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gets used to that change in the color.
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And now it looks like it's getting a little too close to the edge.
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So we can pull that back down maybe a little far to the right.
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And you just do a few until you get several in a row that look very consistent.
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So now it's starting to look very consistent again.
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I'm just going to hit the automatic Track to Start.
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And that looks pretty good.
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Now it looks like we may have gotten a little bit of a hiccup in there.
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But we can go back and check that in a moment.
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And we're just going to let that finish up.
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That looked pretty good there.
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OK so let's just kind of scrub backwards.
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Got a little bit of a hiccup in that area, not terrible.
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Just continuing to scrub backwards there.
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And right there, we get a pretty good little kind of jump.
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It's not the worst.
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But I think this one could probably be moved down a little bit.
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So let's just go ahead and do that.
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We might not have to do it where we delete anything.
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So I think that's probably close enough.
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Let's go ahead and move this one down as well.
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And it looks like we have quite a few in this area.
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I don't want to have to delete too much because it looked so good at the end.
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But we may have to.
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Let's just go ahead and delete everything backwards of this point.
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So Clear Backwards.
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We'll move that tracker down and just do a few tracks,
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just a few Track Previous.
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And that can happen for a lot of reasons,
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changes in brightness,
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the pixels kind of shifting in color because of that brightness change.
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And now this is looking very consistent.
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So let's just go ahead and Track Backwards to the start.
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That looks great.
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Really, really consistent.
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Perfect.
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OK so now we're pretty happy with the way Track 1 looks.
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For the most part, it's really staying in place.
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And this is very, very zoomed in.
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If you come out here to almost that full size,
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that's almost going to look perfect.
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So we're being very meticulous here.
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Now Track 3 and Track 2 I know are going to be very similar.
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So I'm going to challenge you to take care of those in between lessons.
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Just double check them the same way we did Track 4.
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But I'm going to help you with Track 1 because I
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know that it's going to be tough.
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So we're going to skip over to Track 1.
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And we'll start on frame 297.
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And let's just watch this as we go here.
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So we're just kind of trying to stay in that corner.
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And already you can see it's kind of bouncing around a little bit here.
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So we probably need to redo lot of this data.
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So I'm going to come over here to 297.
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We'll just start there.
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And honestly,
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I think that this could actually be a little bit closer in the corner.
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So you know what I'm going to do?
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I'm just going to delete all the previous data.
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And we'll move that tracker up into the corner a little bit better.
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Since we're starting so early on, we might as well.
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Now let's just Track Backwards a few.
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And it looks like it starts to get off there.
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So we'll pull that back.
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And you don't have to be as meticulous every time as I'm being here.
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But whenever you have a screen replacement like this,
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it's very easy for it to become really distorted looking by
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just having a few pixels wrong in your track.
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So I would definitely say that this is where you want to spend
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the most time on getting your track perfect,
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even if it means doing it by hand.
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And you can see that I'm still moving through it at a pretty decent pace.
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It's not like it's taking me all day.
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And honestly,
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sometimes doing it just by hand like this is faster than letting the
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whole thing track through to the end and then realizing that it
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really wasn't as good as you thought it was.
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And you have to start it over and delete frames.
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Sometimes it's a good tool.
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It's definitely going to work for you to do that for
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Track 2 and 3 and between your lessons.
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But for this one, it's tough.
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Now another thing that you can do to kind of help boost this is
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to change one of the options in your tracker.
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So what I'm going to do is come over here to my settings.
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So just go ahead and click that Settings tab.
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And then you're going to just take a look down here at this box
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where it says Adjust For Luminous Changes.
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It tells you right here when you hover over it.
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If your footage changes brightness suddenly,
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then it's going to help to do some filtering to compensate for those changes,
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which is exactly the problem we're having here.
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It's getting brighter whenever those reflections happen on the screen.
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So by checking that and going back over here to our tracker,
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we might be able to track automatically a little bit more effectively now.
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So let's go ahead and just try tracking to start with that option pushed.
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And it looks like it's sticking to that corner, honestly, much better.
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Now it's dancing around a little bit.
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But it's not terrible.
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So that option definitely looks like it helped a little bit.
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Now you don't want to check that unless you absolutely must.
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And here it looks like it's pretty far down from the corner.
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So I'm going to go ahead and stop that.
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And we'll back it up to let's say just kind of right probably
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this area here is where it starts to get off.
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Not a whole lot more,
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but we'll just do a little bit by hand because it doesn't
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take much to really throw your track off and make something
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really start to look strange.
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So I'll just kind of get a few more of these frames done.
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And this is what the problem is is this big glare right
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here is where it really goes crazy.
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So this is definitely helping.
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I'm just going to move that back into position.
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Just get a few more frames here.
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I'm just kind of going through these quickly.
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And having this option even helps as I do this by hand.
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Now that one, just one frame back, looked a little bit strange.
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So let's see what we have here.
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I'm just going to move back to 158 and then go back to zero.
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So I'm going to hit the left arrow key.
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That one right there looks a little bit off.
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So let's grab that and pull that down.
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This one as well.
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And then we're back to kind of where we left off.
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So we'll just track backwards a few more times.
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Track to the last frame, pull this up a bit.
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And I mean, honestly, you can see,
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it's a little bit of a tedious process when you have an
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area that has a lot of changes like this.
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So sometimes you just have to get down and dirty and do it by hand.
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And the tracker, no matter how sophisticated it gets over time,
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you're probably always going to have some of these difficult tracks.
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And unfortunately, sometimes it happens with a screen replacement like this.
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So you have to do a little bit of it by hand.
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And that's just the way that it is.
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Let's go ahead and try to see if we can Track to Start
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from frame 112 where we were at.
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So it looks like it's doing a pretty good job.
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It's pretty close.
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Probably not as good as it would look if we did it by hand but pretty good.
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Now it looks like we got one point in there that really went crazy.
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So right there something went wrong.
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So let's go ahead.
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And we'll move this one back into position.
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And that's just, again, because of that luminous change.
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So let's come back here to about frame 101.
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And I'm just going to hit the left arrow key.
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And we'll just watch this through.
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I'm just hitting it a few times.
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Just watching that as it lines up in this area here
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with the corner of the phone.
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And it looks pretty good.
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Just want to make sure there's no big major pops like what we just fixed.
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And this one looks like it could go back into the corner a little bit better.
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Even though that's light, we still know the corner is right there.
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And this one as well, we'll move back down.
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So I'm just kind of arrowing and moving back.
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And once we hit that zero, all our tracking went away.
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OK so now, we have our tracking data fixed for Track 4 and 1.
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And I want to challenge in between lessons to finish up Track 3 and 2,
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make sure those are sticking to their spots.
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And then in between lessons, I'm going to do the same thing.
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We're going to pick back up in lesson nine.
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And then we'll learn how to apply this data and also how to get
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that screen to look like it's been replaced with an image or a
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video that's playing on the phone.
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So stick around.
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We're going to learn how to do that in our next lesson.
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