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The perspective window allows meshes to be constructed and edited, which is discussed in Building Meshes from Tracker Positions. One mesh can be selected as an edit mesh at any time―select a mesh, then right-click Set Edit Mesh or hit the ‘M’ key. A mesh's status as the edit mesh is independent of its status as a selected mesh: it can be the edit mesh while not being selected. To not have any edit mesh, right-click Clear Edit Mesh or Set Edit Mesh with nothing selected.
When a mesh is an edit mesh, every vertex will be displayed in the perspective view, as long as it is not used only on back faces (changing the view will make them visible). Selected vertices are always shown, even if they are on backfaces.
Tip : the selected vertices of the edit mesh are shown in the 3D viewports, to help you understand where you are working. To take advantage of this, make sure the edit mesh is not also selected: if it is selected, it will be red, and the selected vertices will be too. Select something else, or click on empty space to select nothing at all.
The Lasso Vertices tool respects the "solidity" of the mesh, it will not select vertices that are "through" the object from the current viewpoint.
Lasso Vertices also respects any SynthEyes planes ("clipping planes") that you may have positioned in the scene. By placing one or more clipping planes in the middle of an unfaceted object (tracker positions or lidar data), you can select only the vertices on the front or back, say, and then triangulate them in a controlled way.
To work from a standard mesh to a customized version, the Lightsaber deletion tool may be helpful; it rapidly hacks off unwanted portions of meshes.
See the descriptions of the modes in the perspective view reference.
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