Hi Dat,
Maybe I am not seeing something obvious here, but why don't you use
the OpenSceneGraph VRML loader instead of taking a detour via 3DS Max
and convert to .obj format?
Erik den Dekker
On 26-10-2009, at 16:10, Nguyen Tien Dat wrote:
Dear Ulrich,
Sorry for my stupidity, but I don't know anything about modifying
models. The model is actually created in VRML, and I use 3DS Max to
export it to obj format. So if you can, please tell me a bit more
about how to optimize the model:
- How can you remove duplicate materials (if you can tell me how to do
it by hand, that helps too)
- What else can I do to load the model in an efficient way?
Thank you very much,
Dat
On Mon, Oct 26, 2009 at 7:33 AM, Ulrich Hertlein <[email protected]
> wrote:
Hi Dat,
On 23/10/09 5:26 PM, tien dat wrote:
Dear Ulrich,
Could you tell me more about how to specify that option? Can I
specify
it while using osgviewer.exe or I have to rebuild osgviewer.exe with
the option?
Unfortunately you can't (at the moment) set this option externally or
internally, because the .obj loader doesn't pass the options object
along.
Even if you could it would only avoid loading the same image over
and over
again. It will not solve the massively duplicated state/material
that the
model has.
Either the modelling is done very inefficiently in the 3D
application or
whatever exporter is used messes things up.
If you absolutely have to use osgviewer (rather than your own app)
I'd
actually write a script to optimise the .obj and .mtl files by
removing
duplicate materials.
What you might also want to do is to remove the 'map_Ka' (ambient
texture
map) statements since they are not used with the standard OpenGL
paths (but
are still loaded).
Cheers,
/ulrich
On Fri, Oct 23, 2009 at 5:02 AM, Ulrich Hertlein<[email protected]
>
wrote:
On 23/10/09 10:58 AM, Ulrich Hertlein wrote:
On 22/10/09 9:40 PM, tien dat wrote:
I have a model in obj format and want to load the model into
OpenSceneGraph. When there is no texture, OpenSceneGraph can
load the
model fine. But when I use the model with texture, OpenSceneGraph
allocates a huge amount of memory and crashes. I think it's a
runtime
bug and would like to know how to fix it. Please find some
pictures
Not really a bug, I'd say you're running out of memory.
- try to reduce the image sizes.
- a lot of materials reference the same image. I don't think the
obj
loader caches this which means you're loading that image over
and over
again. Use osgDB::Options to specify caching of images.
Oh, and you seem to have pretty much one material per drawable.
This
will
absolutely kill your performance. Have a look at the .mtl file,
you'll
notice that there are heaps of materials that have identical
properties.
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