expand_vec3
  
  Description:
  public Box expand_vec3 (
Vec3 vec)
  
 
  
    Expands the dimensions of this to include the coordinates of the given vector.
    Parameters:
    
      
        | this | a Box | 
      
        | vec | the coordinates of the point to include, as a Vec3 | 
      
        | res | return location for the expanded box |