[osg-users] Issue with Model Display in OSG with VR Juggler

Gerrick Bivins gbivins at objectreservoir.com
Thu Jul 3 11:58:27 PDT 2008


By that I meant enabling GL_NORMALIZE.


On 7/3/08 1:50 PM, "Gerrick Bivins" <gbivins at objectreservoir.com> wrote:

> 
> Have you tried "normalizing" your normals after scaling?
>  
> 
> On 7/3/08 1:36 PM, "Galen Faidley" <gfaidley at gmail.com> wrote:
> 
>> Doug,
>> 
>> Thanks for getting back to Abhishek on this.  I have been working with
>> him on the issue as well.
>> 
>> We had already tried alternate default lights and the custom lighting
>> but nothing seemed to help (we also tried them again after your post
>> as a sanity check).  However, seeing the working lights in your screen
>> shot made us do some more experimentation.  It turns out we were not
>> quite using the default osgNav.  We had scaled the model by a factor
>> 0.001.  When we removed the scale the lighting behaved as expected.
>> We also added the scale to the osg file and the lighting in osgviewer
>> looked exactly like what we originally saw in juggler (the files are
>> both attached).
>> 
>> So I guess the question is how do we scale a light or at least get
>> equivalently lighting with the scaled model?  I tried a number of
>> things: attaching the light below the scale transform, scaling the
>> light position, and scaling all the light parameters
>> (constant_attenuation, linear_attenuation, etc).  So far none of these
>> seem to make a difference.
>> 
>> We'd appreciate any insight.
>> 
>> Regards
>> Galen
>> 
>> 
>> 
>> On Thu, Jul 3, 2008 at 11:26 AM, Doug McCorkle <mccdo at iastate.edu> wrote:
>>> 
>>> On Jul 3, 2008, at 11:06 AM, Abhishek Seth wrote:
>>> 
>>>> Hi !
>>>> 
>>>> I am having problems with how models look when loaded in my Application. I
>>>> am using OSGNav Sample program from VR Juggler 2.2.1 with OSG 2.4.  Juggler
>>>> uses osgUtil::SceneView but does not use osgViewer::.
>>>> 
>>>> When I load the file in OsgViewer it looks great; however in Juggler's
>>>> OSGNav it looks awful (the colors get washed out). I suspect this is
>>>> related
>>>> to how Juggler is handling the Materials and Lighting while rendering the
>>>> model.  I have spent a fair amount of time working through osgviewer.exe in
>>>> the debuger to try to determine the what it is doing with lighting.  It
>>>> seems to set up multiple lights and calls into the light::apply each frame.
>>>>  Juggler sets up a sigle light and never calls into the light::apply after
>>>> the initial set up.  Before I investigate this further I thought I'd asked
>>>> the list since I have the suspicion that is this something simple and
>>>> someone might recognive the issue my just looking at a few screen shots.  I
>>>> have attached screenshots for both Juggler's OSGNav & OSGViewer and also
>>>> the
>>>> osg file them self.  Furthermore, I have also included a simple model of a
>>>> cube that demonstrates the same effect.
>>> 
>>> I imagine this has something to do with how the light is being setup. I
>>> would try using different settings in the:
>>> 
>>> 
http://developer.vrjuggler.org/docs/vrjuggler/2.2/programmer.reference/class>>>
v
>>> rj_1_1OsgApp.html#1b1994aa3043cd522e749853595d4796
>>> 
>>> or setup your own light:
>>> 
>>> 
http://developer.vrjuggler.org/docs/vrjuggler/2.2/programmer.reference/class>>>
v
>>> rj_1_1OsgApp.html#e0a9dc2d8da29770af997f811df10144
>>> 
>>> Here is what your data looks like in my VR Juggler / OSG app.
>>> 
>>> Doug
>>> 
>>> 
>>> 
>>> 
>>> _______________________________________________
>>> osg-users mailing list
>>> osg-users at lists.openscenegraph.org
>>> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>>> 
>>> 
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