I've resubmitted this as a PR through github:

https://github.com/openscenegraph/OpenSceneGraph/pull/632

On Thu, Sep 20, 2018 at 4:16 PM Farshid Lashkari <[email protected]> wrote:

> Hi Robert,
>
> I've made a change to osgDB::OutputStream::writeArrayImplementation so
> that it writes the array data in a single write operation for binary files.
> This significantly speeds up writing out osgb files for large data sets
> (e.g. point clouds). osgDB::InputStream already performs a similar
> optimization when reading array data from binary files. I've attache the
> modified file.
>
> Cheers,
> Farshid
>
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