Re: [osg-users] Paging strategies for road tiles

2009-08-27 Thread Björn Blissing 
Hi Brian,

Yes, my tiles are a lot larger than 2000 meter. The radius of the first tile is 
9008.5 m, and the road segment contained in that segment is 18017 m. But should 
really the range value be connected to the tile size?? I my mind it should work 
in the way that if my eye point comes within the specified range the LOD tile 
should appear. And by within range I mean that distance from the eye point to 
the edge of the bounding sphere of the tile. But maybe I have completely 
missunderstood the concept here??

Best regards,

Björn


Hi Bjorn,

It looks like the problem is your tiles are larger than 2000 m radius.

Try setting the range to the tile radius, or some multiple (1.5 * radius,
2.0 * radius).

Brian

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-osg-users-boun...@lists.openscenegraph.org wrote: -

To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
From: Björn Blissing bjorn.bliss...@vti.se
Sent by: osg-users-boun...@lists.openscenegraph.org
Date: 08/26/2009 11:56AM
Subject: [osg-users] Paging strategies for road tiles

Hi all,

My application involves road vehicles driving down long roads. Approx 1000
km of continuous road. The problem is that I can only hold about 100 km of
road before system memory runs out. Plan B then naturally falls on some
sort of paging strategy. I rewrote the software so it generates .ive files
containing about 10-30 km road. Then the plan was to use pagedLOD to page
in the files when needed.

My test program only uses four of these tiles, but I do not seem to get it
right. My pagedLOD nodes all lie under the scene graph root. Each one only
contains a reference to the corresponding .ive file and a range set from 0
to 2000 (since I don't want the next geometry to be paged in until I am
closer than 2000 meters). The center of each pagedLOD node is set to the
center point of the geometry in the file and the radius is set to half the
length of the road in the file.

But no geometry is ever paged in.

If I set the center to (0, 0, 0) the geometry will page in the first
segment of road, but then the geometry disappears when I traveled more than
2000 meters. The other tiles never shows up.

I am obviously missing something when setting up my pagedLOD. If someone
could give me a hint I would be most thankful.

Best Regards,
Björn

If I output my scenegraph to a osg-file this is the content:

Group {
  nodeMask 0x
  cullingActive TRUE
  num_children 4
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 8933.58 -982.774 0
Radius 9008.5
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile1.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 19930.8 8704.41 0
Radius 6001
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile2.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 34616.1 17445.3 0
Radius 11875
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile3.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 47754.4 25857.3 0
Radius 3955
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile4.ive
}
num_children 0
  }
}
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Re: [osg-users] Paging strategies for road tiles

2009-08-27 Thread Thrall, Bryan 
Björn Blissing wrote on Thursday, August 27, 2009 2:32 AM:

 Hi Brian,
 
 Yes, my tiles are a lot larger than 2000 meter. The radius of the first tile
 is 9008.5 m, and the road segment contained in that segment is 18017 m. But
 should really the range value be connected to the tile size?? I my mind it
 should work in the way that if my eye point comes within the specified range
 the LOD tile should appear. And by within range I mean that distance from
 the eye point to the edge of the bounding sphere of the tile. But maybe I
 have completely missunderstood the concept here??  

The LOD radius is tested using the distance from the eye point to the center of 
the LOD (which defaults to the center of the bounding sphere), so if you want 
them to appear 2000 meters before the edge of the bounding sphere, you need to 
set the LOD radius to 2000+bounding sphere radius.

 Hi Bjorn,
 
 It looks like the problem is your tiles are larger than 2000 m radius.
 
 Try setting the range to the tile radius, or some multiple (1.5 * radius,
 2.0 * radius).
 
 Brian
 
 This is a PRIVATE message. If you are not the intended recipient, please
 delete without copying and kindly advise us by e-mail of the mistake in
 delivery.
 NOTE: Regardless of content, this e-mail shall not operate to bind CSC to
 any order or other contract unless pursuant to explicit written agreement
 or government initiative expressly permitting the use of e-mail for such
 purpose. *
 -osg-users-boun...@lists.openscenegraph.org wrote: -
 
 To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
 From: Björn Blissing bjorn.bliss...@vti.se
 Sent by: osg-users-boun...@lists.openscenegraph.org
 Date: 08/26/2009 11:56AM
 Subject: [osg-users] Paging strategies for road tiles
 
 Hi all,
 
 My application involves road vehicles driving down long roads. Approx 1000
 km of continuous road. The problem is that I can only hold about 100 km of
 road before system memory runs out. Plan B then naturally falls on some
 sort of paging strategy. I rewrote the software so it generates .ive files
 containing about 10-30 km road. Then the plan was to use pagedLOD to page
 in the files when needed.
 
 My test program only uses four of these tiles, but I do not seem to get it
 right. My pagedLOD nodes all lie under the scene graph root. Each one only
 contains a reference to the corresponding .ive file and a range set from 0
 to 2000 (since I don't want the next geometry to be paged in until I am
 closer than 2000 meters). The center of each pagedLOD node is set to the
 center point of the geometry in the file and the radius is set to half the
 length of the road in the file.
 
 But no geometry is ever paged in.
 
 If I set the center to (0, 0, 0) the geometry will page in the first
 segment of road, but then the geometry disappears when I traveled more than
 2000 meters. The other tiles never shows up.
 
 I am obviously missing something when setting up my pagedLOD. If someone
 could give me a hint I would be most thankful.


-- 
Bryan Thrall
FlightSafety International
bryan.thr...@flightsafety.com
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[osg-users] Paging strategies for road tiles

2009-08-26 Thread Björn Blissing 
Hi all,

My application involves road vehicles driving down long roads. Approx 1000 km 
of continuous road. The problem is that I can only hold about 100 km of road 
before system memory runs out. Plan B then naturally falls on some sort of 
paging strategy. I rewrote the software so it generates .ive files containing 
about 10-30 km road. Then the plan was to use pagedLOD to page in the files 
when needed. 

My test program only uses four of these tiles, but I do not seem to get it 
right. My pagedLOD nodes all lie under the scene graph root. Each one only 
contains a reference to the corresponding .ive file and a range set from 0 to 
2000 (since I don't want the next geometry to be paged in until I am closer 
than 2000 meters). The center of each pagedLOD node is set to the center point 
of the geometry in the file and the radius is set to half the length of the 
road in the file.

But no geometry is ever paged in. 

If I set the center to (0, 0, 0) the geometry will page in the first segment of 
road, but then the geometry disappears when I traveled more than 2000 meters. 
The other tiles never shows up.

I am obviously missing something when setting up my pagedLOD. If someone could 
give me a hint I would be most thankful.

Best Regards,
Björn

If I output my scenegraph to a osg-file this is the content:

Group {
  nodeMask 0x
  cullingActive TRUE
  num_children 4
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 8933.58 -982.774 0
Radius 9008.5
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile1.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 19930.8 8704.41 0
Radius 6001
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile2.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 34616.1 17445.3 0
Radius 11875
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile3.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 47754.4 25857.3 0
Radius 3955
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile4.ive
}
num_children 0
  }
}
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Re: [osg-users] Paging strategies for road tiles

2009-08-26 Thread Brian R Hill 
Hi Bjorn,

It looks like the problem is your tiles are larger than 2000 m radius.

Try setting the range to the tile radius, or some multiple (1.5 * radius,
2.0 * radius).

Brian

This is a PRIVATE message. If you are not the intended recipient, please
delete without copying and kindly advise us by e-mail of the mistake in
delivery.
NOTE: Regardless of content, this e-mail shall not operate to bind CSC to
any order or other contract unless pursuant to explicit written agreement
or government initiative expressly permitting the use of e-mail for such
purpose. •
-osg-users-boun...@lists.openscenegraph.org wrote: -

To: OpenSceneGraph Users osg-users@lists.openscenegraph.org
From: Björn Blissing bjorn.bliss...@vti.se
Sent by: osg-users-boun...@lists.openscenegraph.org
Date: 08/26/2009 11:56AM
Subject: [osg-users] Paging strategies for road tiles

Hi all,

My application involves road vehicles driving down long roads. Approx 1000
km of continuous road. The problem is that I can only hold about 100 km of
road before system memory runs out. Plan B then naturally falls on some
sort of paging strategy. I rewrote the software so it generates .ive files
containing about 10-30 km road. Then the plan was to use pagedLOD to page
in the files when needed.

My test program only uses four of these tiles, but I do not seem to get it
right. My pagedLOD nodes all lie under the scene graph root. Each one only
contains a reference to the corresponding .ive file and a range set from 0
to 2000 (since I don't want the next geometry to be paged in until I am
closer than 2000 meters). The center of each pagedLOD node is set to the
center point of the geometry in the file and the radius is set to half the
length of the road in the file.

But no geometry is ever paged in.

If I set the center to (0, 0, 0) the geometry will page in the first
segment of road, but then the geometry disappears when I traveled more than
2000 meters. The other tiles never shows up.

I am obviously missing something when setting up my pagedLOD. If someone
could give me a hint I would be most thankful.

Best Regards,
Björn

If I output my scenegraph to a osg-file this is the content:

Group {
  nodeMask 0x
  cullingActive TRUE
  num_children 4
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 8933.58 -982.774 0
Radius 9008.5
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile1.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 19930.8 8704.41 0
Radius 6001
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile2.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 34616.1 17445.3 0
Radius 11875
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile3.ive
}
num_children 0
  }
  PagedLOD {
nodeMask 0x
cullingActive TRUE
Center 47754.4 25857.3 0
Radius 3955
RangeMode DISTANCE_FROM_EYE_POINT
RangeList 1 {
  0 2000
}
NumChildrenThatCannotBeExpired 0
FileNameList 1 {
  c://tile4.ive
}
num_children 0
  }
}
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