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Get heading between two points

Hello,

Could someone please try and solve this math problem for me:

i have two coordinates A and B and i need to calculate heading between those two.

Now by heading i want to get direction i am facing if i go from point A to point B.

Now i have checked heading in application and it goes like this:

X1 = 67749,79
Y1 = -75603,24
Z1 = -2854,271

X2 = 67801,95
Y2= -75648,37
Z2 = -2823,197

Heading should be: -7423

This i get from one application (i dont have source code for it so i dont know how heading is calculated but it should be correct).

tried with ATAN2 but it doesnt return same resoult.

Thank you!

ozo

How are you expressing a direction in 3-D space?
What does a heading of -7423 mean?

Tagyourareit

ASKER

Hello,

How are you expressing a direction in 3-D space?

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What do u mean by that?

What does a heading of -7423 mean?

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Its a short ... Signed 16-bit integer

Tagyourareit

ASKER

I've requested that this question be deleted for the following reason:

Its a badly formulated question. Let me think about it and will post better one.

ozo

A direction in three-dimensional space is usually expressed with two or three real numbers. e.g. as altitude&azimuth or as direction cosines or as a unit vector, ...
How are you describing a direction as a single integer?

Tagyourareit

ASKER

Well function i have is like this:

  public static short GetHeading(float x, float y)
        {
            return (short) (Math.Atan2(y, x)*32768/Math.PI);
        }

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ozo

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Tagyourareit

ASKER

I will accept the answer its partially what i want.

Thank you for now.