PCL检查无效点

NaN视为无效点
代码如下：

#include 
#include 

#include 

int
main ()
{
  pcl::PointXYZ p_valid; p_valid.x = 0; p_valid.y = 0; p_valid.z = 0;
  std::cout << "Is p_valid valid? " << pcl::isFinite(p_valid) << std::endl;

  // If any component is NaN, the point is not finite.
  pcl::PointXYZ p_invalid; p_invalid.x = std::numeric_limits::quiet_NaN(); p_invalid.y = 0; p_invalid.z = 0;
  std::cout << "Is p_invalid valid? " << pcl::isFinite(p_invalid) << std::endl;

  return (0);
}

来源：PCL官方示例