I asked Radu how this might affect Planet PCL, and it seems he has no objections:
On Wed, Nov 2, 2011 at 8:50 AM, Radu B. Rusu <rusu@willowgarage.com> wrote:
We do not use +Inf, or -Inf in the code explicitly other than Basti's
RangeImage code (which will have to get rewritten at some point). PCL
does use NaNs everywhere else. The thing with +Inf and -Inf could come
in handy with some laser sensor data as we ticketed a long time ago, so
it's great that the thread is moving along.
We do try to use isfinite instead of isnan, so from my perspective, this shouldn't affect PCL in any negative way.
If the convention becomes NaN, +Inf, -Inf, we'll make sure to support it in PCL 2.0 "natively".
Cheers,
Patrick