   The distance between 2 triangles?
  I need a algorithm to calculate the distance between 2 triangles in 3D space!thx! 
  the distance between which parts of the triangles?  each infinetesimally small part of each triangle is a different distance away from each infinetesimally small part of the other triangle.if you mean just the center, it''s a simple distance formula:distance = sqrt( (x2-x1)^2 + (y2-y1)^2 + (z2-z1)^2 );if you mean the how far apart the triangles are at their closest point, i guess you''d have to do distance from a point to a plane equation which involves some linear algebra (look up "3d math tutorial" in google for a brief introduction and some equations).dunno if that helps.  can you be more specific?-me ;  I wrote an algorithm that does what you want -- it''s used in my triangle-triangle collision program. The function is triangle::Distance() in the file DataTypes.h. You can read a little about it at the top of Main.cpp.The function is complicated, but it works -- I haven''t noticed any bugs yet.   ~CGameProgrammer( ); -- Post screenshots of your projects. 100+ posts already in the archives. ;  this may be of use:http://astronomy.swin.edu.au/~pbourke/geometry/linefacet/if your ultimate goal is to determine if two triangles intersect. ;  my goal is to calculate the distance between their closet points,thx ;  Yes, that''s what mine does -- return the minimum distance between the two triangles. It doesn''t return the points themselves but it returns the distance.   ~CGameProgrammer( ); -- Post screenshots of your projects. 100+ posts already in the archives. ;  thank you, CGPbut what "Direction" means in UINT Distance ( Type* Distance, plane* Plane, triangle Other, vector Direction )?i just want to know how to calculate the minimum distance between *stationary* triangles. ;quote:Original post by gotton  thank you, CGPbut what "Direction" means in UINT Distance ( Type* Distance, plane* Plane, triangle Other, vector Direction )?i just want to know how to calculate the minimum distance between *stationary* triangles.   Oh yeah, I forgot. Sorry. Then my code isn''t what you want.   ~CGameProgrammer( ); -- Post screenshots of your projects. 100+ posts already in the archives. 