Re: [osg-users] Virtual Planet Builder

[Paul Melis]

michael.schm...@l-3com.com wrote:


Hello,

I thought I would take a look at virtual planet builder, but I’m 
having difficulty figuring out how to build osgdem. Step 2 on the 
“osgdem Quick Step by Step Guide” seems like it might be out of date. 
Any help would be appreciated.


To increase the chances of getting an answer, please specify *exactly* 
what you find is out of date...


Paul

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Re: [osg-users] Virtual Planet Builder

[Michael . Schmidt]

Step 2 says make a copy of "Make/dependencies".  Where is
"Make/dependencies"?

> -Original Message-
> From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
> boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
> Sent: Tuesday, March 31, 2009 8:57 AM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Virtual Planet Builder
> 
> michael.schm...@l-3com.com wrote:
> >
> > Hello,
> >
> > I thought I would take a look at virtual planet builder, but I'm
> > having difficulty figuring out how to build osgdem. Step 2 on the
> > "osgdem Quick Step by Step Guide" seems like it might be out of
date.
> > Any help would be appreciated.
> >
> To increase the chances of getting an answer, please specify *exactly*
> what you find is out of date...
> 
> Paul
> 
> ___
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>
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g
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Re: [osg-users] Virtual Planet Builder

[Paul Melis]

michael.schm...@l-3com.com wrote:

Step 2 says make a copy of "Make/dependencies".  Where is
"Make/dependencies"?
  

Did you see this page?
http://www.openscenegraph.org/projects/VirtualPlanetBuilder

The build instructions there seem to be very recent (March 2009)...

Paul
  

-Original Message-
From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
Sent: Tuesday, March 31, 2009 8:57 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Virtual Planet Builder

michael.schm...@l-3com.com wrote:


Hello,

I thought I would take a look at virtual planet builder, but I'm
having difficulty figuring out how to build osgdem. Step 2 on the
"osgdem Quick Step by Step Guide" seems like it might be out of
  

date.
  

Any help would be appreciated.

  

To increase the chances of getting an answer, please specify *exactly*
what you find is out of date...

Paul

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Re: [osg-users] Virtual Planet Builder

[Michael . Schmidt]

Yes.  That page refers me to the osgdem page.

"To generate database see osgdem user guide page
http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides/osgde
m "

> -Original Message-
> From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
> boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
> Sent: Tuesday, March 31, 2009 9:04 AM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Virtual Planet Builder
> 
> michael.schm...@l-3com.com wrote:
> > Step 2 says make a copy of "Make/dependencies".  Where is
> > "Make/dependencies"?
> >
> Did you see this page?
> http://www.openscenegraph.org/projects/VirtualPlanetBuilder
> 
> The build instructions there seem to be very recent (March 2009)...
> 
> Paul
> >
> >> -Original Message-
> >> From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
> >> boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
> >> Sent: Tuesday, March 31, 2009 8:57 AM
> >> To: OpenSceneGraph Users
> >> Subject: Re: [osg-users] Virtual Planet Builder
> >>
> >> michael.schm...@l-3com.com wrote:
> >>
> >>> Hello,
> >>>
> >>> I thought I would take a look at virtual planet builder, but I'm
> >>> having difficulty figuring out how to build osgdem. Step 2 on the
> >>> "osgdem Quick Step by Step Guide" seems like it might be out of
> >>>
> > date.
> >
> >>> Any help would be appreciated.
> >>>
> >>>
> >> To increase the chances of getting an answer, please specify
*exactly*
> >> what you find is out of date...
> >>
> >> Paul
> >>
> >> ___
> >> osg-users mailing list
> >> osg-users@lists.openscenegraph.org
> >>
> >>
> >
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or
> > g
> > ___
> > osg-users mailing list
> > osg-users@lists.openscenegraph.org
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-
> openscenegraph.org
> >
> >
> 
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Re: [osg-users] Virtual Planet Builder

[Robert Osfield]

Thanks for the pointer Mike, I've now updated the page that I presume you
were looking at:

http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides/osgdem

On Tue, Mar 31, 2009 at 2:59 PM,  wrote:

> Step 2 says make a copy of "Make/dependencies".  Where is
> "Make/dependencies"?
>
> > -Original Message-
> > From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
> > boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
> > Sent: Tuesday, March 31, 2009 8:57 AM
> > To: OpenSceneGraph Users
> > Subject: Re: [osg-users] Virtual Planet Builder
> >
> > michael.schm...@l-3com.com wrote:
> > >
> > > Hello,
> > >
> > > I thought I would take a look at virtual planet builder, but I'm
> > > having difficulty figuring out how to build osgdem. Step 2 on the
> > > "osgdem Quick Step by Step Guide" seems like it might be out of
> date.
> > > Any help would be appreciated.
> > >
> > To increase the chances of getting an answer, please specify *exactly*
> > what you find is out of date...
> >
> > Paul
> >
> > ___
> > osg-users mailing list
> > osg-users@lists.openscenegraph.org
> >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or
> g<http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or%0Ag>
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> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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Re: [osg-users] Virtual Planet Builder

[Michael . Schmidt]

Thanks for the quick update.

 



From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Robert
Osfield
Sent: Tuesday, March 31, 2009 9:09 AM
To: OpenSceneGraph Users
Subject: Re: [osg-users] Virtual Planet Builder

 

Thanks for the pointer Mike, I've now updated the page that I presume
you were looking at:

http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides/osgde
m

On Tue, Mar 31, 2009 at 2:59 PM,  wrote:

Step 2 says make a copy of "Make/dependencies".  Where is
"Make/dependencies"?


> -Original Message-
> From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-
> boun...@lists.openscenegraph.org] On Behalf Of Paul Melis
> Sent: Tuesday, March 31, 2009 8:57 AM
> To: OpenSceneGraph Users
> Subject: Re: [osg-users] Virtual Planet Builder
>
> michael.schm...@l-3com.com wrote:
> >
> > Hello,
> >
> > I thought I would take a look at virtual planet builder, but I'm
> > having difficulty figuring out how to build osgdem. Step 2 on the
> > "osgdem Quick Step by Step Guide" seems like it might be out of
date.
> > Any help would be appreciated.
> >
> To increase the chances of getting an answer, please specify *exactly*
> what you find is out of date...
>
> Paul
>
> ___
> osg-users mailing list
> osg-users@lists.openscenegraph.org
>
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or
g
<http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.o
r%0Ag> 
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g

 

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Re: [osg-users] Virtual planet builder

[Chris Hanson]

I think you can get the beginners guides in ebook form if you don't want
dead trees.

There aren't a ton of guides on VPB to be honest. I wrote a whitepaper on
how it works, but it's not really a users' guide.

http://alphapixel.com/wp-content/uploads/2015/04/OpenSceneGraph-OSG-Virtual-Planet-Builder-VPB-OSGDEM.pdf
​
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Re: [osg-users] virtual planet builder

[OpenSceneGraph Users]

Hi ?

On Thu, 12 Mar 2020 at 11:14, OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:

> I want to create one airport runway terrain data. for creating terrain
> data osgdem and virtual planet builder libraries are required.
>
> I have osg 3.2.0 libraries which are compiled in msvs 2010.
>

3.2.0 is a 7 year old version of the OSG We are now on 3.6.5.   That's
7 years of feature improvements and bug fixes you are missig out on.  Plus
if you have problems then who's going to be also using such an old version
of the OSG?

The best version to get support with is OSG-3.6.5, I strongly recommend
that you use this version.  This way if you have problems then others will
be in far better position to help you.



> so, if anybody sends prebuild virtual planet builder (msvs 2010), it will
> use for my project.
>

I don't know of anyone publishing binaries for VPB, let alone for a really
old version of the OSG and compiler set.  You'll need to compile VPB
yourself.



> and I need one more help. where I can found elevation data and texture
> data to create terrain data in .ive format.
>

The .ive format is deprecated, I recommend that you move to the native
.osgb binary format that replaced .ive as the standard for the OSG back in
OSG-3.0, 9 years ago.

As for elevation and texture data, are you looking for free data? What
region?

It would also be worth providing a bit of information about your own skill
set so others can know what level to pitch replies as it.

Cheers,
Robert.
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Re: [osg-users] virtual planet builder

[OpenSceneGraph Users]

Thank you for your suggestions..
I will use higher version osg.

And actually i need elevation data and texture data for free. And i require
one airport (any) area.

So if possible send me the details.

On Thu, Mar 12, 2020, 8:05 PM OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:

> Hi ?
>
> On Thu, 12 Mar 2020 at 11:14, OpenSceneGraph Users <
> osg-users@lists.openscenegraph.org> wrote:
>
>> I want to create one airport runway terrain data. for creating terrain
>> data osgdem and virtual planet builder libraries are required.
>>
>> I have osg 3.2.0 libraries which are compiled in msvs 2010.
>>
>
> 3.2.0 is a 7 year old version of the OSG We are now on 3.6.5.   That's
> 7 years of feature improvements and bug fixes you are missig out on.  Plus
> if you have problems then who's going to be also using such an old version
> of the OSG?
>
> The best version to get support with is OSG-3.6.5, I strongly recommend
> that you use this version.  This way if you have problems then others will
> be in far better position to help you.
>
>
>
>> so, if anybody sends prebuild virtual planet builder (msvs 2010), it will
>> use for my project.
>>
>
> I don't know of anyone publishing binaries for VPB, let alone for a really
> old version of the OSG and compiler set.  You'll need to compile VPB
> yourself.
>
>
>
>> and I need one more help. where I can found elevation data and texture
>> data to create terrain data in .ive format.
>>
>
> The .ive format is deprecated, I recommend that you move to the native
> .osgb binary format that replaced .ive as the standard for the OSG back in
> OSG-3.0, 9 years ago.
>
> As for elevation and texture data, are you looking for free data? What
> region?
>
> It would also be worth providing a bit of information about your own skill
> set so others can know what level to pitch replies as it.
>
> Cheers,
> Robert.
>
>
> --
> You received this message because you are subscribed to the Google Groups
> "OpenSceneGraph Users" group.
> To unsubscribe from this group and stop receiving emails from it, send an
> email to osg-users+unsubscr...@googlegroups.com.
> To view this discussion on the web visit
> https://groups.google.com/d/msgid/osg-users/mailman.76085.1584023698.7167.osg-users-openscenegraph.org%40lists.openscenegraph.org
> 
> .
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Re: [osg-users] virtual planet builder

[OpenSceneGraph Users]

Robert,

What are you working on?

-p callahan

On Thu, Mar 12, 2020 at 2:30 PM OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:

> Thank you for your suggestions..
> I will use higher version osg.
>
> And actually i need elevation data and texture data for free. And i
> require one airport (any) area.
>
> So if possible send me the details.
>
> On Thu, Mar 12, 2020, 8:05 PM OpenSceneGraph Users <
> osg-users@lists.openscenegraph.org> wrote:
>
>> Hi ?
>>
>> On Thu, 12 Mar 2020 at 11:14, OpenSceneGraph Users <
>> osg-users@lists.openscenegraph.org> wrote:
>>
>>> I want to create one airport runway terrain data. for creating terrain
>>> data osgdem and virtual planet builder libraries are required.
>>>
>>> I have osg 3.2.0 libraries which are compiled in msvs 2010.
>>>
>>
>> 3.2.0 is a 7 year old version of the OSG We are now on 3.6.5.
>> That's 7 years of feature improvements and bug fixes you are missig out
>> on.  Plus if you have problems then who's going to be also using such an
>> old version of the OSG?
>>
>> The best version to get support with is OSG-3.6.5, I strongly recommend
>> that you use this version.  This way if you have problems then others will
>> be in far better position to help you.
>>
>>
>>
>>> so, if anybody sends prebuild virtual planet builder (msvs 2010), it
>>> will use for my project.
>>>
>>
>> I don't know of anyone publishing binaries for VPB, let alone for a
>> really old version of the OSG and compiler set.  You'll need to compile VPB
>> yourself.
>>
>>
>>
>>> and I need one more help. where I can found elevation data and texture
>>> data to create terrain data in .ive format.
>>>
>>
>> The .ive format is deprecated, I recommend that you move to the native
>> .osgb binary format that replaced .ive as the standard for the OSG back in
>> OSG-3.0, 9 years ago.
>>
>> As for elevation and texture data, are you looking for free data? What
>> region?
>>
>> It would also be worth providing a bit of information about your own
>> skill set so others can know what level to pitch replies as it.
>>
>> Cheers,
>> Robert.
>>
>>
>> --
>> You received this message because you are subscribed to the Google Groups
>> "OpenSceneGraph Users" group.
>> To unsubscribe from this group and stop receiving emails from it, send an
>> email to osg-users+unsubscr...@googlegroups.com.
>> To view this discussion on the web visit
>> https://groups.google.com/d/msgid/osg-users/mailman.76085.1584023698.7167.osg-users-openscenegraph.org%40lists.openscenegraph.org
>> 
>> .
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>>
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Re: [osg-users] virtual planet builder

[OpenSceneGraph Users]

I am doing M.Tech. My MTech project is terrain rendering and head-up
display for civil aircraft. the project concept is creating all the
symbology present in head-up-display and rendering an airport terrain data
into HUD background and flying through that airport using flightgear
simulator data (socket programming).

On Fri, Mar 13, 2020 at 3:28 AM OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:

> Robert,
>
> What are you working on?
>
> -p callahan
>
> On Thu, Mar 12, 2020 at 2:30 PM OpenSceneGraph Users <
> osg-users@lists.openscenegraph.org> wrote:
>
>> Thank you for your suggestions..
>> I will use higher version osg.
>>
>> And actually i need elevation data and texture data for free. And i
>> require one airport (any) area.
>>
>> So if possible send me the details.
>>
>> On Thu, Mar 12, 2020, 8:05 PM OpenSceneGraph Users <
>> osg-users@lists.openscenegraph.org> wrote:
>>
>>> Hi ?
>>>
>>> On Thu, 12 Mar 2020 at 11:14, OpenSceneGraph Users <
>>> osg-users@lists.openscenegraph.org> wrote:
>>>
 I want to create one airport runway terrain data. for creating terrain
 data osgdem and virtual planet builder libraries are required.

 I have osg 3.2.0 libraries which are compiled in msvs 2010.

>>>
>>> 3.2.0 is a 7 year old version of the OSG We are now on 3.6.5.
>>> That's 7 years of feature improvements and bug fixes you are missig out
>>> on.  Plus if you have problems then who's going to be also using such an
>>> old version of the OSG?
>>>
>>> The best version to get support with is OSG-3.6.5, I strongly recommend
>>> that you use this version.  This way if you have problems then others will
>>> be in far better position to help you.
>>>
>>>
>>>
 so, if anybody sends prebuild virtual planet builder (msvs 2010), it
 will use for my project.

>>>
>>> I don't know of anyone publishing binaries for VPB, let alone for a
>>> really old version of the OSG and compiler set.  You'll need to compile VPB
>>> yourself.
>>>
>>>
>>>
 and I need one more help. where I can found elevation data and texture
 data to create terrain data in .ive format.

>>>
>>> The .ive format is deprecated, I recommend that you move to the native
>>> .osgb binary format that replaced .ive as the standard for the OSG back in
>>> OSG-3.0, 9 years ago.
>>>
>>> As for elevation and texture data, are you looking for free data? What
>>> region?
>>>
>>> It would also be worth providing a bit of information about your own
>>> skill set so others can know what level to pitch replies as it.
>>>
>>> Cheers,
>>> Robert.
>>>
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "OpenSceneGraph Users" group.
>>> To unsubscribe from this group and stop receiving emails from it, send
>>> an email to osg-users+unsubscr...@googlegroups.com.
>>> To view this discussion on the web visit
>>> https://groups.google.com/d/msgid/osg-users/mailman.76085.1584023698.7167.osg-users-openscenegraph.org%40lists.openscenegraph.org
>>> 
>>> .
>>> ___
>>> osg-users mailing list
>>> osg-users@lists.openscenegraph.org
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>>
>>> --
>>> You received this message because you are subscribed to the Google
>>> Groups "OpenSceneGraph Users" group.
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>>> .
>>>
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>> 
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Re: [osg-users] virtual planet builder

[OpenSceneGraph Users]

I am doing M.Tech. My MTech project is terrain rendering and head-up
display for civil aircraft. the project concept is creating all the
symbology present in head-up-display and rendering an airport terrain data
into HUD background and flying through that airport using flightgear
simulator data (socket programming)

On Fri, Mar 13, 2020 at 3:28 AM OpenSceneGraph Users <
osg-users@lists.openscenegraph.org> wrote:

> Robert,
>
> What are you working on?
>
> -p callahan
>
> On Thu, Mar 12, 2020 at 2:30 PM OpenSceneGraph Users <
> osg-users@lists.openscenegraph.org> wrote:
>
>> Thank you for your suggestions..
>> I will use higher version osg.
>>
>> And actually i need elevation data and texture data for free. And i
>> require one airport (any) area.
>>
>> So if possible send me the details.
>>
>> On Thu, Mar 12, 2020, 8:05 PM OpenSceneGraph Users <
>> osg-users@lists.openscenegraph.org> wrote:
>>
>>> Hi ?
>>>
>>> On Thu, 12 Mar 2020 at 11:14, OpenSceneGraph Users <
>>> osg-users@lists.openscenegraph.org> wrote:
>>>
 I want to create one airport runway terrain data. for creating terrain
 data osgdem and virtual planet builder libraries are required.

 I have osg 3.2.0 libraries which are compiled in msvs 2010.

>>>
>>> 3.2.0 is a 7 year old version of the OSG We are now on 3.6.5.
>>> That's 7 years of feature improvements and bug fixes you are missig out
>>> on.  Plus if you have problems then who's going to be also using such an
>>> old version of the OSG?
>>>
>>> The best version to get support with is OSG-3.6.5, I strongly recommend
>>> that you use this version.  This way if you have problems then others will
>>> be in far better position to help you.
>>>
>>>
>>>
 so, if anybody sends prebuild virtual planet builder (msvs 2010), it
 will use for my project.

>>>
>>> I don't know of anyone publishing binaries for VPB, let alone for a
>>> really old version of the OSG and compiler set.  You'll need to compile VPB
>>> yourself.
>>>
>>>
>>>
 and I need one more help. where I can found elevation data and texture
 data to create terrain data in .ive format.

>>>
>>> The .ive format is deprecated, I recommend that you move to the native
>>> .osgb binary format that replaced .ive as the standard for the OSG back in
>>> OSG-3.0, 9 years ago.
>>>
>>> As for elevation and texture data, are you looking for free data? What
>>> region?
>>>
>>> It would also be worth providing a bit of information about your own
>>> skill set so others can know what level to pitch replies as it.
>>>
>>> Cheers,
>>> Robert.
>>>
>>>
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Re: [osg-users] virtual planet builder & cluster culling

[Robert Osfield]

Hi Rick,

It sounds like the set up of the ClusterCullingCallback is the
problem.  Could you provide an example dataset and camera position
that illustrates the incorrect culling?

FYI, the actual control point "should" automatically adjusted to lie
above the tops of the mountains with the deviation angle adjusted
appropriately.  The concept of cluster culling is that the boundary of
the tile would occlude the terrain, so you compute the position and
angle to fit to this.  Clearly there must be something wrong in this
calculation, but what is the question... without the a good example of
where the current computation is failing I can't easily reproduce and
know if that an fix actual works.

Cheers,
Robert.

On Tue, Jun 23, 2009 at 12:36 PM, Rick Middelkoop wrote:
> Hi everyone,
>
> We came across a cluster culling problem with Virtual Planet
> Builder-generated globe datasets.
>
> With the viewpoint at a relatively low altitude (say <1000m), descending
> causes distant mountain-tiles to be culled at a moment when they have
> not yet disappeared completely behind the horizon. The far plane is
> behind these mountains, so frustum clipping is not the cause.
>
> It seems that tiles containing (high) mountains are culled sooner than
> 'flat' (elevation=0.0) tiles. At least in our 'globe' datasets
> (generated with different versions of VPB up to 0.9.10) this is the
> case. Of course, what you would expect is the opposite.
>
> The cluster culling control point for a terrain tile lies at the top
> elevation for the tile, which seems very valid. However, the cluster
> culling calculation (which calculates the angle between the (far away)
> tile normal and the vector from the control point to the viewpoint, and
> compares this with a 'deviation' threshold to determine if a tile is to
> be culled) works in such a way that the high elevation of the control
> point causes a larger angle between the 'control point to
> viewpoint'-vector and the tile normal than a low elevation of the
> control point would.
>
> In other words, when looking from the viewpoint to the control point at
> the top of the mountain, one is looking from below [= reason for
> culling: a flat (elevation=0.0) tile would be behind the horizon], while
> from the same viewpoint one could be looking at a 'flat' (elevation=0.0)
> tile from the top [= reason for not culling]. A threshold deviation
> seems to aim to compensate for tile elevation, but this does not prevent
> the mountain tiles from being incorrectly culled.
>
> The solution that works for us (but which may not be optimal), is to set
> the elevation of the control point at -(top elevation), and thus
> introduce a bias that allows the mountains to remain visible when not
> yet completely behind the horizon.
>
> Did anyone experience this problem? If it turns out that this is a
> general vpb/cluster culling issue, what would be the best solution?
>
> Thanks & Best Regards,
>
> Rick.
>
>
>
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Re: [osg-users] virtual planet builder & cluster culling

[Rick Middelkoop]

Hi Robert,

Thanks for looking into this! We do not have a suitable example dataset
online at the
moment, but we will prepare one for you. I will send you an e-mail once
it is online.

Cheers,

Rick.

Robert Osfield wrote:

  Hi Rick,

It sounds like the set up of the ClusterCullingCallback is the
problem.  Could you provide an example dataset and camera position
that illustrates the incorrect culling?

FYI, the actual control point "should" automatically adjusted to lie
above the tops of the mountains with the deviation angle adjusted
appropriately.  The concept of cluster culling is that the boundary of
the tile would occlude the terrain, so you compute the position and
angle to fit to this.  Clearly there must be something wrong in this
calculation, but what is the question... without the a good example of
where the current computation is failing I can't easily reproduce and
know if that an fix actual works.

Cheers,
Robert.

On Tue, Jun 23, 2009 at 12:36 PM, Rick Middelkoop wrote:
  
  
Hi everyone,

We came across a cluster culling problem with Virtual Planet
Builder-generated globe datasets.

With the viewpoint at a relatively low altitude (say <1000m), descending
causes distant mountain-tiles to be culled at a moment when they have
not yet disappeared completely behind the horizon. The far plane is
behind these mountains, so frustum clipping is not the cause.

It seems that tiles containing (high) mountains are culled sooner than
'flat' (elevation=0.0) tiles. At least in our 'globe' datasets
(generated with different versions of VPB up to 0.9.10) this is the
case. Of course, what you would expect is the opposite.

The cluster culling control point for a terrain tile lies at the top
elevation for the tile, which seems very valid. However, the cluster
culling calculation (which calculates the angle between the (far away)
tile normal and the vector from the control point to the viewpoint, and
compares this with a 'deviation' threshold to determine if a tile is to
be culled) works in such a way that the high elevation of the control
point causes a larger angle between the 'control point to
viewpoint'-vector and the tile normal than a low elevation of the
control point would.

In other words, when looking from the viewpoint to the control point at
the top of the mountain, one is looking from below [= reason for
culling: a flat (elevation=0.0) tile would be behind the horizon], while
from the same viewpoint one could be looking at a 'flat' (elevation=0.0)
tile from the top [= reason for not culling]. A threshold deviation
seems to aim to compensate for tile elevation, but this does not prevent
the mountain tiles from being incorrectly culled.

The solution that works for us (but which may not be optimal), is to set
the elevation of the control point at -(top elevation), and thus
introduce a bias that allows the mountains to remain visible when not
yet completely behind the horizon.

Did anyone experience this problem? If it turns out that this is a
general vpb/cluster culling issue, what would be the best solution?

Thanks & Best Regards,

Rick.



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