[osg-users] FloatArray usage in UniformBuffer example

[P. Que]

Hi, I'm trying to learn how to use uniform buffers in OSG. Looking at https://github.com/openscenegraph/OpenSceneGraph/blob/master/examples/osguniformbuffer/osguniformbuffer.cpp#L156, it seems to use the `FloatArray` type for cpu-side memory storage of the data, and `theFloatArray->setBufferObject(ubo.get());` to associate that data with the UBO (for later uploading via UniformBufferBinding).

If this understanding is correct, I'm rather surprised the cpu-side storage of the data has a custom type - an api more like `ubo->setBuffer(&theFloatArray, theFloatArraySize)` would allow arbitrary cpu-side storage of data, within a `std::vector`, for example.

What is the significance of the `FloatArray->setBufferObject(bufferObject)` API, and is it required for using Uniform Buffers?
Thank you.
-P. Que
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