In most tutorial that involving LiDAR this resolution tag always set to `0.01` and even from [sdformat.org](http://sdformat.org/spec?ver=1.6&elem=sensor#range_resolution) the default value is `0` with explanation **Linear resolution of each ray**. I have tried to Google 'linear resolution' keyword and only irrelevant topic came out. When I try to change its value to huge number as:0.14 6.0 1
And there is no significant different of data produced. So what actually it is?
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