lib/mageo/vector3d.rb in mageo-0.0.3 vs lib/mageo/vector3d.rb in mageo-0.0.4

@@ -96,10 +96,14 @@
     end
 
     self.angle_radian(vec0, vec1) * (180.0 / Math::PI)
   end
 
+  def self.midpoint(vec1, vec2)
+    (vec1.to_v3d + vec2.to_v3d)/2.0
+  end
+
   # Instance methods
 
   def [](index)
     raise RangeError, "index: #{index}." if (index < 0 || 2 < index)
     super index
@@ -233,7 +237,11 @@
   # self.rotate_axis(1, 0.5*PI)
   def rotate_axis(axis, radian)
     tmp = Marshal.load(Marshal.dump(self))
     tmp.rotate_axis!(axis, radian)
     tmp
+  end
+
+  def midpoint(other)
+    self.class.midpoint(self, other)
   end
 end