Hi Adrien,
Scrive Adrien <[EMAIL PROTECTED]>:
> Hi,
> I'm developping an Angmented Reality environnement based on OpenSG.
> From an acquisition system I get the complete geometry of all the real
> objects in
> the capture room. In the same time I get the images from a video camera .
> I will set the virtual camera on the same place that the real one
> relatively to the
> coordinate of the capture system.
Interesting.... What kind of system are you using for that?
> I would like to mix real and virtual and do not have occlusion problems
>
> My idea is to set the camera images as the background of the scene (this
> is already working)
> and then to update the Z-Buffer with the meshes from my capture system
> (I already constructed the node with
> its geometry...) but not to draw them. So then I could draw the other
> objects, the virtual ones,
> and with the values of the meshes of real objects in z-buffer it would
> only draw the parts of virtual objects
> in front.
>
> Does anyone know if it's possible to do something like this (update the
> Depth Buffer with a geometry but not
> draw it) ?
You can use a ColorMaskChunk in order to disable the
drawing into the colorbuffer, something like this:
occluderMat = ColorMaskChunk::create();
beginEditCP(occluderMat);
occluderMat->setMaskR( false );
occluderMat->setMaskG( false );
occluderMat->setMaskB( false );
occluderMat->setMaskA( false );
endEditCP(occluderMat);
You have to add this chunk to the material associated to
your "occluder" geometries. You'll most probably also have
to set the "sortKey" to ensure that the occluding geometries
are rendered first. Search for the "setSortKey" method.
Regards,
Toni
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