Re: [ggt-devel] Sphere emptiness

[Kevin M. <ke...@su...>]

What does it mean to have an empty sphere? Or aabox for that matter. Is
it same as sphere volume == 0. Or is it a flag to signify something
else (I.e. No objects contained in).

if vol == 0 then why not set the size to 0... If it is so you can
remember previous size, why distinguish 0 volume, why not and an N
volume switch... Why a switch at all...

Excuse me for not knowing/remembering the purpose of mEmpty...

Thanks,

Sent from my Phone
From: Paul Martz
Sent: 10/23/2012 5:15 PM
To: ggt...@li...
Subject: [ggt-devel] Sphere emptiness
Hi all -- My project uses both gmtl::Sphere and gmtl::AABox as
bounding volumes.
But I've noticed that Sphere lacks the 'bool mEmpty' member variable that is
present in AABox. Is there a reason for this? If not, I'd like to add it.

I would also modify Containment.h's extendVolume(Sphere&,...) to respect that
variable (as is already done for extendVolume(AABox&,...) ). Finally, I'd also
add new extendVolume() functions to extend Sphere around an AABox and
vice versa.

Just wanted to see if there was a logical reason for the current
design before I
embarked on changing the code. I know that I can emulate the desired behavior
with a negative radius, but it seems to me it would be desirable to have this
functionality in gmtl rather than only in my project.

Thanks,
    -Paul




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