Make Object
The Make Object node can be used to change camera motion relative to a static object into object motion relative to a camera.
This can be used in situations where a Camera Solver has been used to track a moving rigid object, and that object needs to be transferred into a scene containing a tracked camera.
The Make Object node has two inputs and one output. The first input must contain a camera tracked relative to the background scene, and the second input must contain a camera tracked relative to an object.
The output of the node contains a scene with the object moving relative to the camera from the first input. This is similar to the result that would be obtained by tracking a moving object using an Object Solve node.
Any mesh objects that are present in the second input will also be transformed so they are relative to the camera from the first input.
Usage
Camera motion from the second input is changed automatically into object motion relative to the camera from the first input. The name of the new object group can be changed by editing the Object group name box.
The Orientation mode menu can be used to change the position and orientation of the coordinate system for the new motion group. Note that when positioning the new motion group, it is important to use the Distance from camera orientation mode to adjust the distance between the object and the camera, as this cannot be estimated automatically.
To produce the best results, the focal length of the cameras provided by both inputs should be the same. If this is not the case, the trackers provided by the second input may not align correctly with image features when viewed through the camera from the first input. The recommended workflow is to first track the proper camera in the scene (i.e. the first input), then use this same known focal length in the camera solver that is used to generate the moving object (i.e. the second input).
Controls
Object group name: The tracker group that will represent the moving object in the scene. The group can be renamed by typing into the menu edit box.
Orientation mode: The mode by which to orient the coordinate system of the object group. Options are:
Translate origin, display a translation widget allowing the origin of the group's coordinate system to be adjusted in either the Cinema window or a 3D viewer window.
Rotate around origin: display a rotation widget allowing the orientation of the group's coordinate system to be adjusted in either the Cinema window or a 3D viewer window.
Distance from camera: display a scale widget at the current camera position in a 3D viewer window. Adjusting the scale widget will scale the object group and move it towards or away from the camera.
Fly: When this option is chosen, the group's coordinate system can be translated, rotated or scaled by holding the Option key and using the right, middle or left mouse buttons in the Cinema window.
Display
Show Ground: When enabled, the ground plane will be displayed.
Show Horizon: When enabled, the horizon line will be displayed.
Show Bound: When enabled, the bounding box of the object group will be displayed
Show Path: When enabled, the path of the moving object will be displayed
Show Trackers: When enabled, tracking points will be displayed
Show Meshes: When enabled, mesh objects will be displayed
Default Keyboard Shortcuts
Keyboard shortcuts can be customised in the Preferences.
Show Ground |
Control+G |
Show Horizon |
Control+H |
Show Bound |
Control+B |
Show Path |
Control+P |
Show Trackers |
Control+T |
Show Meshes |
Control+M |