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 0xffffffff
cullingActive TRUE
num_children 4
PagedLOD {
nodeMask 0xffffffff
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 0xffffffff
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 0xffffffff
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 0xffffffff
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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