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VPB stability, and LODs


 
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gooznick
Newbie


Joined: 23 Apr 2018
Posts: 1

PostPosted: Mon Apr 23, 2018 5:14 am    Post subject:
VPB stability, and LODs
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Hi,

I'm using OpenSceneGraph quite a long time, but iv'e never used VPB because I was not sure that it's stable.

a. Is it ? Current version is 0.x, doesn't that mean that it's not stable ?
b. Which version of VPB is compatible with which version of OSG ? Does a database created with older versions of VPB is forward compatible with newer OSG versions?
c. some details : my main usage is doing off screen rendering for imagery. Can I make VPB/OSG load only the final LOD that'll be shown? The loading of intermediate LOD's is useless when rendering offscreen.

Thank you!

Cheers,
gooz
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robertosfield
OSG Project Lead


Joined: 18 Mar 2009
Posts: 12027

PostPosted: Mon Apr 23, 2018 1:58 pm    Post subject:
VPB stability, and LODs
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Hi Gooz,

I just checked and I see that I haven't tagged 1.0.0 but I have
created the VirtualPlanetBuilder-1.0 branch, so I'll need to tag this
when I get a chance this week. The git master version is on 1.1 now.
So it's now it's officially stable, though as it's a quieter annex of
the OSG suite of software it's not something under active development.

VPB master and the 1.0 branch works fine with 3.6 and OSG master, and
should work fine with other relatively recent OSG versions, though I
haven't tested it against 3.2 or 3.0 for a number of years.

To see how to load the highest res tiles have a look at the osgposter
example : OpenSceneGraph/examples/osgpostor. You have to loaded the
tiles incrementally top down till all the required tiles are loaded
for the view frustum you are using. There isn't a way to go directly
to the leaves as there is no way to know what the highest res tiles
are for any position on the database as VPB databases can be high res
one area, and low res the next all depending upon the source data.

Robert.



On 23 April 2018 at 06:14, Robert Ched <> wrote:
Quote:
Hi,

I'm using OpenSceneGraph quite a long time, but iv'e never used VPB because I was not sure that it's stable.

a. Is it ? Current version is 0.x, doesn't that mean that it's not stable ?
b. Which version of VPB is compatible with which version of OSG ? Does a database created with older versions of VPB is forward compatible with newer OSG versions?
c. some details : my main usage is doing off screen rendering for imagery. Can I make VPB/OSG load only the final LOD that'll be shown? The loading of intermediate LOD's is useless when rendering offscreen.

Thank you!

Cheers,
gooz

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