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