Sorry, I didn't realise I was your personal tutor ;)
Imagine this image ...
1.....2
.......
.......
3.....4
Neither alignment methods are finding the center of the chassis. The first works out the vector from midpoint of wheel 1&3 to midpoint of 2&4, the second works out the vector from midpoint of 3&4 to midpoint of 1&2.
It's quite logical if you think about it. For example, you could align the x-axis solely based on a vector from wheel 1 to wheel 2 but ..... using the average of the left wheels and right wheels makes the alignment smoother when you consider it will be rare for all 4 wheels to be touching the ground
Stevie
Imagine this image ...
1.....2
.......
.......
3.....4
Neither alignment methods are finding the center of the chassis. The first works out the vector from midpoint of wheel 1&3 to midpoint of 2&4, the second works out the vector from midpoint of 3&4 to midpoint of 1&2.
It's quite logical if you think about it. For example, you could align the x-axis solely based on a vector from wheel 1 to wheel 2 but ..... using the average of the left wheels and right wheels makes the alignment smoother when you consider it will be rare for all 4 wheels to be touching the ground
Stevie