Hi Robert,
I am trying to implement a new ReadFileCallback.
This callback will check the available memory, knowing the maximum
allowed du to JVM usage (c++ engine in Java application), and if there
is not enough memory the callback will not load the file.
I just ran some test to estimate the required memory space for each ive
size.
For big ive files, the memory used seems to be around 2*ive file size.
For little files (<5Mo) this is very fluctuating ... there is not
regularity (ratio from 1.8 to 5 ).
Do you have any idea of how to estimate better the required memory space
? (only ive files as input datas)
Thanks.
Regards,
Vincent.
Robert Osfield a écrit :
Hi Vincent,
On Thu, Jan 14, 2010 at 5:50 PM, Vincent Bourdier
<vincent.bourd...@gmail.com> wrote:
I don't understand how this is working.
If a pagedLod is required it will be loaded... but we can cap the number of
lod...
This sounds contradictory for me.
The max number of PagedLOD is a target that it aims for, but if there
are more PagedLOD required for rendering the current frame then the
max will exceed this trarget, and only once the view changes to
require less PagedLOD will the total number come down again.
If you wanted the LOD control then you just implement this yourself
using osgDB::Registry::ReadFileCallback that loads the tiles and then
modifies PagedLOD that it loads that are higher than a certain
resolution.
Do you mean that using my own readFileCallback is not sufficient and I'll
need to modify PagedLod sources too ?
There is no need to modify any OSG sources to adjust the LOD ranges.
The ReadFileCallback can do the actual loading of the subgraph and
then catch the and modify the LOD ranges.
Personally I'd go go using the Camera LODScale though, it's a much simpler tool.
Robert.
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