Added color caster from vec3f to vec4f

git-svn-id: http://www.openmesh.org/svnrepo/OpenMesh/trunk@442 fdac6126-5c0c-442c-9429-916003d36597

src/OpenMesh/Core/Utils/color_cast.hh

@@ -128,6 +128,20 @@ struct color_caster<Vec4uc,Vec3f>
   }
 };
 
+template <>
+struct color_caster<Vec4f,Vec3f>
+{
+  typedef Vec4f return_type;
+
+  inline static return_type cast(const Vec3f& _src)
+  {
+    return Vec4f( _src[0],
+                  _src[1],
+                  _src[2],
+                  1.0f );
+  }
+};
+
 template <>
 struct color_caster<Vec4uc,Vec4f>
 {