Getting an angle from look at vectors (and other stuff)
Author
I'm looking for a generel purpouse math library that takes care of most basic maths such as a function that takes in a look at vector (such as D3DXVECTOR3(0.2, 1, 0.5)) and returns an angle of the direction.
I'm working with DirectX (if thats relevent)
Author
Quote:Original post by Rattenhirn
What angle would you like to get from a vector?
basic trigonometry stuff, like:
vector of (0, 1, 0.2) -> get angle between the y and z so...
/|
/ | 0.1
<---
0.2
or something like that.
Ok, basic trigonomy is covered by the c standard library.
Just include math.h.
To get the angle between y and z use:
double angle = atan2(y, z);
or if you don't need double precision:
float angle = atan2f(y, z);
Depending on which compiler you use, you may have to put "std::" before "atan2" or write "using namespace std;" somewhere in the file.
Hope that helps!
Just include math.h.
To get the angle between y and z use:
double angle = atan2(y, z);
or if you don't need double precision:
float angle = atan2f(y, z);
Depending on which compiler you use, you may have to put "std::" before "atan2" or write "using namespace std;" somewhere in the file.
Hope that helps!
Author
Quote:Original post by Rattenhirn
Ok, basic trigonomy is covered by the c standard library.
Just include math.h.
To get the angle between y and z use:
double angle = atan2(y, z);
or if you don't need double precision:
float angle = atan2f(y, z);
Depending on which compiler you use, you may have to put "std::" before "atan2" or write "using namespace std;" somewhere in the file.
Hope that helps!
yep that helped heaps.
Thank you :)
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