Join Andy Needham for an in-depth discussion in this video Using the point cloud view, part of Learning Foundry CameraTracker for After Effects 2014.
We've seen our data represented by numbers and points on the graph, but how about actually seeing what those 2D points look like in 3D? Let's take a look at how we'd set that up. So we select our layer and in the effect controls for the camera tracker we'll just create a scene. When the camera tracker creates a scene in addition to the camera linked to the null. It also creates a 3D representation of all the solved points and color codes them using the footage layer's original RGB values. We can toggle the point cloud by using this button, so if we toggle the 2D 3D view you can see our points.
Now, using the active camera, isn't particularly useful, with the point cloud. So, let's switch over to one of the custom views. Now you can see the point cloud, and if we scrub the time, you can see how our camera is moving through the shot. You can navigate this view quite easily by pressing the C key and just using the camera tools. And if we zoom in, we can really get inside the 3-D scene. If we had more track points we'd have a more detailed point cloud. So switching back to the 2D, view and just choosing our active camera again we'll go to our selection tool.
You can only select points in this view, but if we move back to the 3D view these points are now selected, and using the custom views will give us an indication of where they are in 3D space. See this one is quite far back compared to these ones, and if we've even selected some ones that are much further in the distance. So we need to be careful of that when selecting things such as ground planes. So being able to see a 3D representation of our data, using the point cloud is a great way to verify where our points are.
It also helps us to see if points aren't where they should be, or if we have points that won't contribute to our solve. For example in the distance or in the sky somewhere, we can take steps to remove these points and we can move on to setting the ground plane for our scene.
- Tracking the motion in a shot
- Solving 3D camera data
- Refining tracks
- Identifying and fixing tracking errors
- Exporting 3D track data
- Using CameraTracker data in composites