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In the Place mode, you can slide the selected object around on the surface of any existing mesh objects. For example, place a pyramid onto the top of a cube to build a small house. Or, place a mesh onto a tracker or extra point or vertex of a lidar mesh.
You can also use the place mode to put a tracker’s seed/lock point onto the surface of an imported reference head model, for example, to help set up tracking for marginal shots.
Tip : See Using a 3-D Model for directions on how to use Place mode for object tracking.
For this latter workflow, set up trackers on the image, import the reference model. (If you are setting up a mesh for object tracking, eg a head track, leave it at the origin without rotating it, as coordinates will be generated in the world coordinate system, so that the origin becomes the object location.) Go to the Camera and Perspective viewport configuration. Set the perspective view to Place mode. Select each tracker in the camera view, then place its seed point on the reference mesh in the perspective view. You can reposition and reorient the perspective view however you like to make this easy—it does not have to be, and should not be, locked to the source imagery to do this. This work should go quite quickly.
Tip : if you are placing one mesh on another, or placing already-solved trackers, you can select the next object to move by holding down shift while clicking. Then click/drag again to place the object. Or, control/command-D to unselect everything, then click to select.
If you need to place trackers (or meshes) at the vertices of the mesh, not on the surface, hold the control key down as you use the place mode, and the position will snap onto the vertices. The vertices of lidar meshes are also snappable.
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