X-Git-Url: http://git.megacz.com/?p=anneal.git;a=blobdiff_plain;f=src%2Fedu%2Fberkeley%2Fqfat%2Fgeom%2FVec.java;h=c601b15916069bad7e85bfc0b3447fcd0d1bb0a1;hp=9d1d30bb79d31f657ec5ab4a823711050b504171;hb=5f15a6155bf7fbf2d62b3ab9fd992a54af10a95a;hpb=4c6451ef747ae7ffc2aa8955e55254673ac49d16

diff --git a/src/edu/berkeley/qfat/geom/Vec.java b/src/edu/berkeley/qfat/geom/Vec.java
index 9d1d30b..c601b15 100644
--- a/src/edu/berkeley/qfat/geom/Vec.java
+++ b/src/edu/berkeley/qfat/geom/Vec.java
@@ -9,6 +9,7 @@ public final class Vec {
     public Vec(Point p1, Point p2) { this(p2.x-p1.x, p2.y-p1.y, p2.z-p1.z); }
     public Vec cross(Vec v) { return new Vec(y*v.z-z*v.y, z*v.x-x*v.z, x*v.y-y*v.x); }
     public Vec plus(Vec v) { return new Vec(x+v.x, y+v.y, z+v.z); }
+    public Vec minus(Vec v) { return new Vec(x-v.x, y-v.y, z-v.z); }
     public Vec norm() { return mag()==0 ? this : div(mag()); }
     public float mag() { return (float)Math.sqrt(x*x+y*y+z*z); }
     public float dot(Vec v) { return x*v.x + y*v.y + z*v.z; }