[osg-users] obj plugin does not support diffuse and specular texture maps

[Chris Hanson]

I think all that what's going on is that the loader is simply assigning the
image maps (diffuse and specular) to various texture unit numbers:
http://trac.openscenegraph.org/projects/osg//browser/OpenSceneGraph/trunk/src/osgPlugins/obj/ReaderWriterOBJ.cpp?rev=13006#L67
http://trac.openscenegraph.org/projects/osg//browser/OpenSceneGraph/trunk/src/osgPlugins/obj/ReaderWriterOBJ.cpp?rev=13006#L835

but it doesn't really set up a shader or anything special to utilize them,
so the specular texture just clobbers the diffuse texture. You most likely
need to write a small fragment shader to actually interpret the maps in
whatever way you want.

On Mon, Sep 18, 2017 at 2:10 AM, Ralf Habacker <ralf.habacker at freenet.de>
wrote:

> Hi,
>
> we tried to use the obj plugin in an osg based vr application for the
> HTC Vive to load the steamvr controller (which is provided as .obj file)
> and recognized that it is displayed with black surfaces instead of
> showing the provided textures (which works for example in blender).
>
> We found out that the osg plugin shows always black surfaces if a
> material used by an obj file contains a diffuse *and* a specular texture
> which could be verified with the appended test case.
>
> Are there any hints how to solve this issue ?
>
> Regards
> Ralf
>
>
>
>
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>


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