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GPU laser scan passes through objects

Hello,

I am using Ubuntu 18.0.4, melodic, with Nvidia GPU. When an object is placed right in front of turtlebot3 while I am using hokuya normal laser rays there is no problem with rays passing through the object. But, when I am using gpu_rays while the object is very close to the turtlebot3, the GPU Rays are passing through the object just as shown in the figure. I checked this on both burger and waffle models. Can I know what is the problem? And does it happens with GPU rays?

The link where I downloaded turtlebot3 is https://github.com/ROBOTIS-GIT/turtlebot3

GPU Rays passing through object

Normal rays without passing through object