Right hand rules (as I know it):
On your right hand (where the name comes from):
1. thumb is x axis and is pointing in positive direction
2. index finger is y axis pointing in positive direction
3. middle finger is z axis pointing in positive direction
In physics and math, the right hand is naturally aligned so that the z axis points to your eye as you make on "L" with thumb and index finger, 3 o'clock with thumb the clock's small hand and index the large hand. clock.
BUT in BASIC the Y axis points down! still using your right hand, still making an "L" with thumb and index finger, point the y axis down to floor as y goes positive in index finger. Your elbow goes up, you have to swing your arm way over to left AND lo and behold the middle index finger, the positive direction points away for your eye. The z axis did a 180 just like the y axis. And hurts like hell to get the thumb to pointing right as it does in BASIC screen when y is ascending pointed down, it naturally wants to point left when the index finger is pointing down on the desk.
Wait.... now do we also have to remove our eye ball and swing it over to the other side, to restore again z pointing positively to it!
Wow that's new for me, I always forgot to swing the camera over when I flip the y axis, so z is still headed positively at the camera = my eyeball. It should still be 3 O'clock, time didn't do a 180.
Maybe not as easy as WINDOW screen but it builds character! ;-))
Picture this:
On your right hand (where the name comes from):
1. thumb is x axis and is pointing in positive direction
2. index finger is y axis pointing in positive direction
3. middle finger is z axis pointing in positive direction
In physics and math, the right hand is naturally aligned so that the z axis points to your eye as you make on "L" with thumb and index finger, 3 o'clock with thumb the clock's small hand and index the large hand. clock.
BUT in BASIC the Y axis points down! still using your right hand, still making an "L" with thumb and index finger, point the y axis down to floor as y goes positive in index finger. Your elbow goes up, you have to swing your arm way over to left AND lo and behold the middle index finger, the positive direction points away for your eye. The z axis did a 180 just like the y axis. And hurts like hell to get the thumb to pointing right as it does in BASIC screen when y is ascending pointed down, it naturally wants to point left when the index finger is pointing down on the desk.
Wait.... now do we also have to remove our eye ball and swing it over to the other side, to restore again z pointing positively to it!
Wow that's new for me, I always forgot to swing the camera over when I flip the y axis, so z is still headed positively at the camera = my eyeball. It should still be 3 O'clock, time didn't do a 180.
Maybe not as easy as WINDOW screen but it builds character! ;-))
Picture this:
b = b + ...