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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.
Before turning in your roto work, you are required to inspect it first. You need to find the problems not the supervisor. There are several ways to inspect your rotos each designed to reveal a different issue. Here I'll demonstrate several techniques that you can use with your work. I am using the Inspecting Mocha file from the Project Media Folder. First up is the spline only. So let's say that we want to see the spline up the head I'll pan that down and zoom that in.
So by viewing the spline only you can look for jittery edges. So let's see how that looks. Now with the head moving around like that, it's really hard to see any details. So what we need to do is stabilize this picture around that head. So I am going to stop that and go back to Frame 1. Since this shot has not been tracked, we have no stabilizing data. So let's track it, I am going to turn off the head and I am going to turn on a roto that I have already drawn for you.
What I did here was I keyframed this roto just like we saw on the previous movie. So I keyframed it here there, there, there and there. By keyframing it, it will stay on top of a regular moving target. All right so let's track that forward, and even though if the spline looks jumpy it's actually collecting good track data. So let's jump back to the beginning. I am going to turn on Stabilize now, because I've got the head track selected, the screen stabilize will look at the tracking data to stabilize the plate.
So let's play that and sure enough, the head is stabilized. Okay great, we'll stop that go back to the beginning. We'll hide the head track and turn on the head roto. Let's get in a little closer and see how much better this is with the head stabilized. Oh there we go now we can see a lots of issues okay, we got some kind of bobbing thing going on at the hair, the head is changing shape and we got some pops in our facial curvatures here. We'll stop that, and go back to frame one.
So by stabilizing the plate inspection becomes much easier to do. Next, we have to take at the look at the Matte Overlay. So we'll turn off the head. I am going to come down here and select the right leg for you, and we will turn on the Matte Overlay and then I'll scroll the viewer up so you can see the leg. Okay. I am going to turn the spline off, so that we're just looking at the Matte Overlay. The virtue of this view is it helps you to see when the matte is inside its short watch what happens as I single step through this.
We can see that the matte is actually cut inside the shoe and it's actually inside the calf up here. So the matte overlay view is good for showing you where your matte is inside or short. Now let's take a look at the premultiplied view. We will turn the Paint bucket off and this will show us yet a different aspect of our Rotoscope. So let's cruise through here. Oh there we are, you see this black edge that shows me where my roto is wide. I'll step through that, keep looking there, right here my roto is again way too wide.
So the Premultiplied view will show you that the matte is outside of the character while the Overlay shows you if it's inside. Last, let's take at the White Matte. I will turn this off. Let's go back here, turn on our head, re-home the viewer and turn the RGB off so we get a White Matte. Let me also zoom in on this. Again, we're stabilizing the plate with our head track and now we can watch the White Matte over the length of the shot.
Here, we are looking for the chattering edges and you can really see -- look at the head deformations here and this hair popping in and out that we saw earlier with the spline view is even more apparent. We will stop that. So there are four inspection techniques, the Spline Only, which will help you see jittery edges, the Matte Overlay to see if the spline is inside, the pre-multiplied version to see if the matte is outside, and the White Matte version which helps you to see chattering edges. By inspecting your rotos from the several different vantage points like this, you can be sure to find all of the problems before the roto supervisor does.
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