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mocha has always been very popular as a tracking tool, but with the rising interest in stereo 3D conversion, its rotoscoping capabilities have become a favorite player in that pipeline and sales have soared. In this course, Steve Wright covers the basics of operating mocha, as well as advanced tracking and rotoscoping techniques. The course also covers the mocha/Nuke stereo 3D production pipeline in detail.
The Planar Grid is another tool used to assess the accuracy of a track. It can also be aligned with the perspective of a surface. To see how, let's load a clip. We'll go to our New Projects > Choose, go to your Lesson_02_Media folder and select Building tiltup and 01 building tiltup frame, click Open and then OK. This clip has a Building tiltup which of course has a perspective change and of course we have lens distortion.
So there are several issues we're going to have to address with the planar tracker in this clip. We'll stop this, jump to the first frame and first I'm going to show you how to align the grid with the blade. We'll start by tracking the windows here in the middle, we'll just go to up a little X spline here and track forward. All right, we are done tracking, now I'll turn on the Planer Surface. And I'll set the Planar Surface to surround these three windows, because that's what I really want to roto.
So we'll get Planer Surface into position and now we'll check the track, make sure that it locks to the windows nicely, looking good. We'll stop that, go back to frame 1. To turn on the planar grid, we just click this button right here. The planar grid is actually attached to the Planar Surface. So as I move the Planar Surface, you can see that planer grid moving around. Okay, so we can use this to adjust the perspective of the planar grid to match the clip.
In fact, I can do it on any frame I want, so I'll just scooch down here and let's say I want the planar grid to align right here inside this front window area. So I can pull down on this and pull up on that and bring it in from the sides. So bring in this side here and then I can adjust the corners to try and get the perspective to match, get the bottom edge down here for example to line up nicely, I can turn off the Spline to make it easier to see.
This corner sticking out so I'll adjust this corner of the Planar Surface and then get the other corner lined up over here. Notice that when I move one corner, it affects the other, so you have to kind of iterate. This is rather like a four corner pen tool, get that top up there. It's not going up against the bottom of the building, get the corner out here, get it out there, move the left in a bit, move the right out a bit.
Okay, now you're going to get this bottom edge put back. Okay, so I'm lined up on the bottom edge to right edge the top and the side. The planar grid will now move with my clip, because it's latched to the tracking data. Now I can attach as many rotos as I wish to this planar surface. I'll stop this, jump to frame 1. I'm going to turn my Spline back on. I'm going to first rename it so this would be windows track.
This is my tracking spline and I'm going to hide that here. I am done with the Planer Surface and the planar grid. Now I can draw my window rotos. I can also scrub to any frame that I want, push in, reposition, to look at my best view of my target. This is another very cool feature about the planar tracker unlike point trackers you have to very carefully line up your reference frame not too worry, but the planar tracker. All right, I am just going to get me an X spline, go around this window here, done and I'm going to name this one window1, okay and I'll do another one over here, pull that sharp, and name this one window2 and one more X spline for this window, pull that sharp.
Yeah, it looks good and rename this one window3. Okay, to make these easier to see, I'll turn the brightness of the viewer down a little bit here. Now we can see our three window rotos a little easier and of course they're not locked to any tracker data at all. I'll also move the playhead off of the frame they were created on just so you can see the action better.
My layer list is longer than the Layer Control window. So I'm going to hide the Edge Properties, so I can see everything. Okay, now I want to link each one of these three roto splines to my tracking spline the windows track. So I'll select a first one and he lights up over here, I'll come down here to Link to track. By default, any roto you draw is linked to itself. So to link it to another track, we'll open this popup and say Link to the windows track.
Watch the spline when I let go. He suddenly jumps up to the window. That's because he is now locked to the tracking data. Also, if I deselect, suddenly, he is a different color, he is green instead of purple. What's going on here? Now I'll select him. From down here in the colors list, a Non-trackable spline is colored green. So I'll click over here to deselect. There is his green color. He has switched his status to non-trackable. Also the cog went out.
So let's link window2. We'll select it, come to the Link to track, say Link to the windows track, deselect, green, cog gone. Select the third one, Link to track > windows track, deselect green. Now we play the clip and all three rotos are attached to the planar surface moving along with the tracking data. We'll stop that, jump to frame 1. I'll rehome the viewer, so I can show you that if you have a spline selected and you turn on the planar grid, it will be the grid for that spline.
So if I want to see the grid that I set up for my tracker, I have to select the tracker spline and I'm done with my viewer gamma adjustments so I'll turn that off.
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