PointCloud: Fix calculation of bounding radius

Radius should be max length of all point vectors, not squared length.

src/rviz/ogre_helpers/point_cloud.cpp

@@ -161,7 +161,7 @@ const Ogre::AxisAlignedBox& PointCloud::getBoundingBox() const
 
 float PointCloud::getBoundingRadius() const
 {
-  return bounding_radius_;
+  return Ogre::Math::Sqrt(bounding_radius_); // we actually computed the squared radius
 }
 
 void PointCloud::getWorldTransforms(Ogre::Matrix4* xform) const
@@ -481,7 +481,6 @@ void PointCloud::addPoints(Point* points, uint32_t num_points)
   Ogre::AxisAlignedBox aabb;
   aabb.setNull();
   uint32_t current_vertex_count = 0;
-  bounding_radius_ = 0.0f;
   uint32_t vertex_size = 0;
   uint32_t buffer_size = 0;
   for (uint32_t current_point = 0; current_point < num_points; ++current_point)