 Problems? Is your data what you think it is? PerlMonks

### Re^3: Rotate a 3D vector

 on Apr 28, 2010 at 23:02 UTC ( #837410=note: print w/replies, xml ) Need Help??

in reply to Re^2: Rotate a 3D vector
in thread Rotate a 3D vector

To find the angle between the two vectors, you need to normalize them (so they have length of 1 unit) by doing this (v is the vector you want to normalize):
```float distance = sqrt(v.x*v.x + v.y*v.y + v.z*v.z);
v.x = v.x/distance;
v.y = v.y/distance;
v.z = v.z/distance;
[download]```
Then find the dot product of the two normalized vectors (Va and Vb):
```float dotProduct = Va.x*Vb.x + Va.y*Vb.y + Va.z*Vb.z;
[download]```
This gives you the cosine of the angle, so simple do:
```acos(dotProduct);
[download]```
This will give you the angle. I think this post was a bit late :S

Log In?
 Username: Password:

What's my password?
Create A New User
Node Status?
node history
Node Type: note [id://837410]
help
Chatterbox?
and the web crawler heard nothing...

How do I use this? | Other CB clients
Other Users?
Others making s'mores by the fire in the courtyard of the Monastery: (4)
As of 2021-04-21 06:02 GMT
Sections?
Information?
Find Nodes?
Leftovers?
Voting Booth?

No recent polls found

Notices?