# How to find the angle betwen two vectors

 07 July 2004 fabman Anywhere but here..   portfolio Fabian choqueiro! from hell somewhere, España How to find the angle betwen two vectors I got two vectors A and B as Point3, how could I find the 3 eulerangles between them, I look in the manual but I can't find a "simple" method to do it. What I wan't to do is to copy the result rotation on to other object rotations. Thank you in advance. __________________ Mathematics, rightly viewed, possesses not only truth, but supreme beauty - a beauty cold and austere, like that of sculpture. share quote
 07 July 2004 lechoo Frequenter Hi, I think you can use quats. Here's my idea: calculate cross product of A and B. Put its x,y,z into quat's x,y,z. Thats your rotation vector, now you need angle. Equation is very simple: ang = acos((A.x*B.x+A.y*B.y+A.z*B.z) / ((length A)*(length B))). ang is w part of quat. Now simply convert quat to eulerangles using "as eulerangles". I think it should work but never tried that. share quote
 07 July 2004 gdimmrt Frequenter Look up "Dot Product" in the MS reference manual. share quote
 08 August 2004 Wahooney Demon Onion Slayer   portfolio Keith Boshoff Programmer - Scribe - Unapologetic Blender Boy - Ex-Max Enthusiast RetroEpic Software CC Cape Town, South Africa There is actually only one angle between two vectors (in relation to eachother). You can get that value like this: ang = acos (dot vec1 vec2) Note that the vectors must be normalized. To get the angle of a vector in worldspace you're gonna hafta use some trig. share quote
 01 January 2006 CGTalk Moderation Expert Thread automatically closed This thread has been automatically closed as it remained inactive for 12 months. If you wish to continue the discussion, please create a new thread in the appropriate forum. __________________ CGTalk Policy/Legalities Note that as CGTalk Members, you agree to the terms and conditions of using this website. share quote

 Posting Rules You may not post new threads You may not post replies You may not post attachments You may not edit your posts vB code is On Smilies are On [IMG] code is On HTML code is Off CGSociety Society of Digital Artists www.cgsociety.org Powered by vBulletinCopyright ©2000 - 2006, Jelsoft Enterprises Ltd.