Shift + s -> Cursor to Center
Lower horizontal command bar. Add -> Mesh -> Cylinder
Click on the “+” which is in the upper right corner of the screen. The “+” appears on the left corner with respect to the right vertical command bar. After having clicked on “+”, a new menu will appear.
If you would like to change the size of the cylinder, then go to Dimensions of the newly appeared menu and, for example, change the height by changing the Z dimension. Please, note that, using such a menu, it is possible to generate a cylinder with elliptical cross section, besides the circular one.
You can change the location and orientation in a similar way to “Generate a STY triangular planar mesh in Blender”.
To create the mesh, then switch from “object mode” to “edit mode”. This is possible by acting on the lower horizontal command bar or by clicking in any part of the image and then pressing “Tab” (“Tab” switches between object and edit modes). In the edit mode, then CTRL + t. The cylinder will be divided into triangles. After that, go to Mesh -> Edges -> Subdivide (Mesh is on the lower horizontal command bar). Repeat the subdivision the number of times you need, until the mesh is sufficiently refined.
Finally, File -> Export -> Stanford (.ply)
Remember that, if you want to turn your object, you have to simultaneously press the left and middle mouse buttons.