Hi Simon,
On Mon, 2006-03-13 at 12:46 +0100, Simon Haegler wrote:
> hi list
>
> i have a couple of obj files (one building model per file) which
> all use the same mtl for textures. i did some tests with the
> sceneviewer and it seems that for each obj group the textures are
> loaded into memory, without checking if the same texture is
> already there.
Yup. The Materials for each file are independent, because we can't
guarantee that two materials are the same just because they have the
same name.
> questions/observations:
>
> (1) as soon as the size of the loaded textures hits about 50mb
> (sceneviewer stats), the framerate drops from 200fps down to 5fps.
> is this a opengl issue?
Sounds like you're hitting a limit in your graphics card and it starts
thrashing (uploading textures for every frame).
> (2) is there a possibility to tell the SceneFileHandler not to
> load the same texture file twice?
You should be able to fix the duplication by running a SharePtr GraphOp
after loading the models:
GraphOpSeq seq("SharePtr(includes=Material)");
seq.run(root);
This is not the most efficient way, as it has to compare the textures,
but it's the fastest. If you need it more efficiently we would have to
think about a more persistent material pooling.
Hope it helps
Dirk
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