Selection of Points in 3D

When you want to select some points after you have aligned your images, just select a tool in the Registration & Sparse Point Cloud part of the SCENE 3D/TOOLS tab. You can choose from the following selection tools:

Point Rect: Left-click, hold and move the mouse to select points with a rectangle.
Point Lasso: Left-click, hold and move the mouse in a circular way.
Expand: Create a partial selection of 3D points, then click the Expand button. The tool will expand selection of 3D points visible by a set of cameras with all points seen by these cameras.
Select All: This button selects all 3D points in the current 3D scene if some points have been already selected.
Deselect: Clears any present selection of 3D points (and cameras).
Find Points: Select several cameras and click Find Points. All points visible to selected cameras will be selected.

TIP: You can modify your selections also using CTRL for union, SHIFT for subtraction, and CTRL + SHIFT for intersection.

The following are closely related to the above-mentioned tools:

Find Images will select all cameras that see a selected point cloud.
Find CPs will find and select all control points in selected images.

Point Cloud Export

The Point Cloud button in the Export part of the ALIGNMENT tab exports all tie points in the scene no matter the point selection.
First, choose a format and the path where the point cloud file will be stored. Then the below dialog appears:

Coordinate system

Grid plane - as seen in the 3Ds view.
Project output - this option is available only when the model is georeferenced. You can choose the output coordinate system in the WORKFLOW tab / Application / Settings / Coordinate systems.
Shifted project output - same as Project output, just moved to the center of a reconstruction.

Move X / Y / Z - moves objects in any direction by a unit defined in the coordinate system. By default in meters.
Scale X / Y / Z - scales coordinates by changing the default scale number. This is useful if you want to change units from meters to centimeters.