How to find angle using 2 vectors

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Permalink Reply by Caglar on April 28, 2011 at 12:43pm

http://www.rhino3d.com/5/rhinocommon/html/M_Rhino_Geometry_Vector3d...

 

Did you have a look at the file I attached in your previous question?

Permalink Reply by eric brown on April 28, 2011 at 1:29pm

Thanks again.

Yes I did.  I'm still trying to get my head around the math but it looks to simplify my code if I plug it in as a function.  

However what I'd really like to know is where to find the 'home' URL for this link you just sent me.  It looks like it could be the source of the answers for a bunch of questions I have.

Permalink Reply by Caglar on April 28, 2011 at 1:54pm

http://www.rhino3d.com/5/rhinocommon/

 

Don't bother with that code in my script. It's just a way to deal with negative angles. Native method only returns positive values.

 

Assuming you have three points p1,p2,p3 you can do it so:

 

Dim vec1 As New Vector3d(p2 - p1)    

Dim vec2 As New Vector3d(p3 - p1)
    

Dim angle As Double = Vector3d.VectorAngle(vec1, vec2) * ((180 / math.PI))

 

That would return degrees.

 

 

Permalink Reply by Chan on July 8, 2012 at 7:00pm

I am new to grasshopper scripting. May you tell me how to enter the script?