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Having just looked at the code; the height parameters seem to slice in the pointcloud orthogonal to the z axis in the height interval between min_height and max_height.

There are the parameters angle_min and angle_max, they are referring to the width of the simulated laserscan. So, that is not what you are looking for either.

I guess you may need to transform the pointcloud that are going into the pointcloud_to_laserscan, maybe just changing the reference frame.