[pdal] PDAL with PCL Installation

[Bradley Chambers]

>
> Thanks, that did it.  It was the c++11 switch to PCL that finally got it
> working.
>

Great!


> I'm trying to view a file (192MB) and it's awfully slow to do anything.
> Any tips to speed up visualization?
>

How slow is slow? I've loaded a 134MB file in under 20 seconds on my
laptop. I've loaded a 1GB file in about 2 minutes (this one is pretty
sluggish once loaded).

We aren't really doing anything fancy with the viewer, just leveraging
PCL's visualizer under the hood. We do create a PCL PointCloud with
XYZIRGBA information when converting from PDAL's PointBuffer, regardless of
whether or not this information is available. I suppose if you only have
XYZ data (or only want to visualize the XYZ information), then there may be
some savings in using the PointXYZ point type instead. This is something
we'd have to explore in the code, not something you could switch on the
command line. If you're curious, the place to look is
https://github.com/PDAL/PDAL/blob/master/plugins/pcl/io/PCLVisualizer.cpp#L146
.
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