title: Trying to convert a Float64 into Float32 on ROS
body: <p>i'm working on a project on ROS, i'm trying to pass from a visualization of a marker into a visualization of a point in a pointcloud.</p>
  
  <p>the markers coordinates are rappresented in float64</p>
  
  <p>the points (of pcl) coordinates are rappresented in float32</p>
  
  <p>i use a simil c++ for implementing code.</p>
  
  <p>i want simply to try if i'm going to lose a lot of precision in terms of performance with this type of conversion.
  but don't know how to do it.</p>
  
  <p>did someone could help me with a piece of code that make this conversion?</p>
  
  <p>thanks!</p>