atan2; asin

[ahso]

Hi
I don't really understand what those functions return. Any good
explanation or visual presentation?
Many thanks
Michael Sgier

 

[Victor Bazarov]

I don't really understand what those functions return. Any good
explanation or visual presentation?

atan2 returns the arctangent (the inverse function of tangent) of the
first arg divided by the second arg. asin returns the arcsine (the
inverse function of sine) of its argument.

For the visual representation please turn to a trigonometry textbook.

V

 

[red floyd]

Hi
I don't really understand what those functions return. Any good
explanation or visual presentation?

arcsin and arctan.

What's the problem?

 

[ahso]

What's the problem?

I try to follow a airplane with another and I found:

h = int(atan2((x1-x),(z-z1)));
p = int(asin((y1-y)/hy));

x/y/z in the 3D coordinate system. So my problem is to understand and
use this as much as i can. Basically
I try to get behind the enemy plane with those functions. ie. first
output directions and distances to x1/y1/z1 from
xyz of my plane.
h and p don't actually seem to return any useful data.
Many thanks for your help.
Michael

 

[aku ankka]

I try to follow a airplane with another and I found:

h = int(atan2((x1-x),(z-z1)));
p = int(asin((y1-y)/hy));

x/y/z in the 3D coordinate system. So my problem is to understand and
use this as much as i can. Basically
I try to get behind the enemy plane with those functions. ie. first
output directions and distances to x1/y1/z1 from
xyz of my plane.
h and p don't actually seem to return any useful data.
Many thanks for your help.
Michael

You might be better off not using euler angles, you will get gimbal
locks which the aicraft won't. Use matrix/quaternion form for
orientation, it will simplify the computation a lot even if this is
off-topic here.

 

[Richard Herring]

In message

I try to follow a airplane with another and I found:

h = int(atan2((x1-x),(z-z1)));
p = int(asin((y1-y)/hy));

x/y/z in the 3D coordinate system. So my problem is to understand and
use this as much as i can. Basically
I try to get behind the enemy plane with those functions. ie. first
output directions and distances to x1/y1/z1 from
xyz of my plane.
h and p don't actually seem to return any useful data.

Those int() conversions are indeed discarding most of the available
data, since the results from atan2 and asin are in radians ;-)