[Bf-committers] Mesh-Tools in 2.36?

[Campbell J Barton]

Funny- I added that exact function in my teach draw mode, it was used to 
draw angles between edges in a face.
Teach draw should make if for 2.37
- Cam


Mal wrote:

> Is there a reason that there isn't a function called 
> getAngleBetween2Vectors in the Blender maths library ( as well as 
> several other utility functions )?
>
> If they were built in, it would mean that a lot of different coders 
> wouldn't have to rewrite relatively simple ( unless you get the 
> formulae wrong of course ) functions, and could focus on the real work 
> of implementing new features.
>
> Mal
>
>>> How do you find the angle between two vectors?  I
>>> found a python function that does this, can you call
>>> python functions from c?
>>>  
>>>
>> I believe that that would be the arc cosine of the dot product of the 
>> vectors.  So, I think that would be:
>>
>> Angle = acos(v1[0] * v[0] + v1[1] * v2[1] + v1[2] + v2[2])
>>
>> . . .where v1 and v2 are vectors.  This is of course in radians, so 
>> to convert to degrees you would do this:
>>
>> Degree = Angle * 180 / PI (I think).
>>
>> Remember that the dot product of two normalized (where length=1) 
>> vectors is equal to the cosine between them.
>>
>> joeedh
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>
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-- 
Campbell J Barton

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