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

Galen Faidley gfaidley at gmail.com
Thu Jul 3 12:07:23 PDT 2008


Gerrick,

Thanks for the tip.  I searched for osg and "normalizing normals" and
came up with:

posAttitudeTrans->getOrCreateStateSet()->setMode(GL_NORMALIZE,
osg::StateAttribute::ON);

We gave it a try and sure enough it worked.

Regards
Galen

On Thu, Jul 3, 2008 at 1:58 PM, Gerrick Bivins
<gbivins at objectreservoir.com> wrote:
> 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
>>>>
>>>>
>>>>
>>>>
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>>>>
>>>>
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>



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