Ad.1
No in this moment I don't have any :). But I'm almost certainly that operation 
on floats will be faster then on double. And will give opportunity a compiler 
to generate a better assembly ( even generate a sse instructions ).

Ad. 2
I'm not that sure that math operations are trivial. I have done some research 
and found that on big graph cull operation are quite expensive. And I have done 
some testing by replace osg math with sse math on it   and performance boost 
what quite notable.

So when is talk about high performance that sse operation are made for that.
Now days a SSE 2 instruction are available on approximate 90% of processors on 
market. 
If you're not entirely convinced in the near future I will try to write a class 
and be tested :).

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http://forum.openscenegraph.org/viewtopic.php?p=56720#56720





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