As I said, rotFromTo() is all you need:
module rotFromTo(di,do)
if( norm(di-do)==0 || norm(di)==0 || norm(do)==0 )
children();
else
mirror(do/norm(do)+di/norm(di)) mirror(di) children();
module axis(x,y){
color("red") hull() {sphere(0.01norm(x)); translate(x)
sphere(0.01norm(x)); }
color("blue") hull() {sphere(0.01norm(y)); translate(y)
sphere(0.01norm(y)); }
}
module object(x,y,colour=undef) {
axis(x,y);
color(colour)
polyhedron([[0,0,0], x, y, cross(x,y)/norm(x)/norm(y)+(x+y)/3],
[[0,1,2],[3,2,1],[3,1,0],[3,2,0], ]);
}
X = [-1,2,1];
Y = [1,1,1];
object(X,Y);
translate([(norm(X)+norm(Y))/2,0,0])
rotFromTo(cross(X,Y),[0,0,1])
object(X,Y,"magenta");
translate([(norm(X)+norm(Y)),0,0])
rotFromTo(cross(Y,X),[0,0,1])
object(X,Y,"green");
[image: laydown.PNG]
Maurice van Peursem openscad@vanpeursem.net wrote:
