Tipp Alignment in Meshlab
a tip about Meshlab. If you want to connect 2 objects or if you want to align them individually. It's easy to do manually. Look at the picture
1 - choose your object
2 - press this button
3 - select "R" rotate or "T" translate
when finished, right click on the name of the object under "1" and select "Flatten visible Layers" in the menu. All visible objects are merged into one.
This is much easier and better than with the Alignment Tool (the button with "A")
Don't forget: press return after every change under "3"