Re: [osg-users] osg::View NO_LIGHT bug?

[Robert Osfield]

HI Nickolai,

If you don't want the default global light then simple do:


   viewer.setLightingMode(osg::Viewer::NO_LIGHT);


Rather than switching it to SKY_LIGHT!

Robert.




On 5 June 2016 at 22:44, Nickolai Medvedev  wrote:
> Well, we can deceive viewer if we make so:
>
>
> Code:
> viewer.getLight()->setAmbient(osg::Vec4(0.0,0.0,0.0,1.0));
> viewer.getLight()->setPosition(osg::Vec4(0.0,0.0,0.0,1.0));
> viewer.getLight()->setDiffuse(osg::Vec4(0.0,0.0,0.0,1.0));
> viewer.getLight()->setConstantAttenuation(0.003);
> viewer.getLight()->setLinearAttenuation(0.1);
> viewer.getLight()->setQuadraticAttenuation(0.1);
> viewer.getLight()->setName("global_light");
> viewer.getLight()->setLightNum(0);
>
> viewer.setLightingMode(osg::View::SKY_LIGHT);
>
>
>
> The light source still be exist, but will be invisible.
>
> Cheers,
> Nickolai
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=67426#67426
>
>
>
>
>
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Re: [osg-users] osg::View NO_LIGHT bug?

[Julien Valentin]

If you don't want any light in your scene
You just  have to
setMode(GL_LIGHTING,OFF,OVERRIDE) on you root's stateset
Hope it helps


Ben Axelrod wrote:
> I cannot seem to turn off the light in osg::View. I can change it between 
> headlight and sky light, but when I try NO_LIGHT, I still get the headlight. 
> 
> > _viewer->getCamera()->getView()->setLightingMode(osg::View::SKY_LIGHT); 
> > //works
>  
> 
> > _viewer->getCamera()->getView()->setLightingMode(osg::View::HEADLIGHT); 
> > //works
>  
> 
> > _viewer->getCamera()->getView()->setLightingMode(osg::View::NO_LIGHT); 
> > //still get headlight
>  
> 
> How can I turn off this default light? How is it related to the osg::Lights 
> in the scene? I noticed when I add an osg::Light, then the headlight is 
> overridden. How can I change the light parameters of the SKY_LIGHT or 
> HEADLIGHT? 
> 
> I am using osg version 2.6. 
> 
> Thanks, 
> -Ben
> 
>  --
> Post generated by Mail2Forum


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Re: [osg-users] osg::View NO_LIGHT bug?

[Nickolai Medvedev]

Well, we can deceive viewer if we make so:


Code:
viewer.getLight()->setAmbient(osg::Vec4(0.0,0.0,0.0,1.0));
viewer.getLight()->setPosition(osg::Vec4(0.0,0.0,0.0,1.0));
viewer.getLight()->setDiffuse(osg::Vec4(0.0,0.0,0.0,1.0));
viewer.getLight()->setConstantAttenuation(0.003);
viewer.getLight()->setLinearAttenuation(0.1);
viewer.getLight()->setQuadraticAttenuation(0.1);
viewer.getLight()->setName("global_light");
viewer.getLight()->setLightNum(0);

viewer.setLightingMode(osg::View::SKY_LIGHT);



The light source still be exist, but will be invisible.

Cheers,
Nickolai

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http://forum.openscenegraph.org/viewtopic.php?p=67426#67426





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Re: [osg-users] osg::View NO_LIGHT bug?

[Robert Osfield]

Hi Ben,

If there are modes in your scene graph that enable lighting then
you'll get the default OpenGL lighting values.  You don't say what
effect you actually want to achieve so can't comment on what you
should do in your scene graph, you'll need to provide more info.

FYI, Viewer is a View, so you only need to do _viewer-setLightingMode(..);

Robert.

On Tue, Feb 17, 2009 at 4:35 PM, Ben Axelrod baxel...@coroware.com wrote:
 I cannot seem to turn off the light in osg::View.  I can change it between
 headlight and sky light, but when I try NO_LIGHT, I still get the headlight.



 _viewer-getCamera()-getView()-setLightingMode(osg::View::SKY_LIGHT);
 //works



 _viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT);
 //works



 _viewer-getCamera()-getView()-setLightingMode(osg::View::NO_LIGHT);
 //still get headlight



 How can I turn off this default light?  How is it related to the osg::Lights
 in the scene?  I noticed when I add an osg::Light, then the headlight is
 overridden.  How can I change the light parameters of the SKY_LIGHT or
 HEADLIGHT?



 I am using osg version 2.6.



 Thanks,

 -Ben

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[osg-users] osg::View NO_LIGHT bug?

[Ben Axelrod]

I cannot seem to turn off the light in osg::View.  I can change it between 
headlight and sky light, but when I try NO_LIGHT, I still get the headlight.


_viewer-getCamera()-getView()-setLightingMode(osg::View::SKY_LIGHT); //works


_viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT); //works


_viewer-getCamera()-getView()-setLightingMode(osg::View::NO_LIGHT); //still 
get headlight

How can I turn off this default light?  How is it related to the osg::Lights in 
the scene?  I noticed when I add an osg::Light, then the headlight is 
overridden.  How can I change the light parameters of the SKY_LIGHT or 
HEADLIGHT?

I am using osg version 2.6.

Thanks,
-Ben
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Re: [osg-users] osg::View NO_LIGHT bug?

[Ben Axelrod]

I still don't know why osg::View::NO_LIGHT doesn't work, but to answer my own 
questions, to turn off the default light completely:

_viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT);
osg::Light* light = _viewer-getCamera()-getView()-getLight();
if (light != NULL)
{
  light-setAmbient(osg::Vec4(0,0,0,1));
  light-setDiffuse(osg::Vec4(0,0,0,1));
  light-setSpecular(osg::Vec4(0,0,0,1));
}

-Ben


From: osg-users-boun...@lists.openscenegraph.org 
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ben Axelrod
Sent: Tuesday, February 17, 2009 11:36 AM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] osg::View NO_LIGHT bug?

I cannot seem to turn off the light in osg::View.  I can change it between 
headlight and sky light, but when I try NO_LIGHT, I still get the headlight.


_viewer-getCamera()-getView()-setLightingMode(osg::View::SKY_LIGHT); //works


_viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT); //works


_viewer-getCamera()-getView()-setLightingMode(osg::View::NO_LIGHT); //still 
get headlight

How can I turn off this default light?  How is it related to the osg::Lights in 
the scene?  I noticed when I add an osg::Light, then the headlight is 
overridden.  How can I change the light parameters of the SKY_LIGHT or 
HEADLIGHT?

I am using osg version 2.6.

Thanks,
-Ben
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Re: [osg-users] osg::View NO_LIGHT bug?

[Tomlinson, Gordon]

just an FYI, that does not turn the light off, its still on and you
paying the cost of it being applied to all the geom in the scene
attached to that view
 

Gordon

__
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Product Manager 3D
Email  : gtomlinson @ overwatch.textron.com
__
(C): (+1) 571-265-2612
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Self defence is not a function of learning tricks 
but is a function of how quickly and intensely one 
can arouse one's instinct for survival 
- Master Tambo Tetsura

 
 



From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ben
Axelrod
Sent: Tuesday, February 17, 2009 3:09 PM
To: OpenSceneGraph Users
Subject: Re: [osg-users] osg::View NO_LIGHT bug?



I still don't know why osg::View::NO_LIGHT doesn't work, but to answer
my own questions, to turn off the default light completely:

 

_viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT);

osg::Light* light = _viewer-getCamera()-getView()-getLight();

if (light != NULL)

{

  light-setAmbient(osg::Vec4(0,0,0,1));

  light-setDiffuse(osg::Vec4(0,0,0,1));

  light-setSpecular(osg::Vec4(0,0,0,1));

}

 

-Ben

 



From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Ben
Axelrod
Sent: Tuesday, February 17, 2009 11:36 AM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] osg::View NO_LIGHT bug?

 

I cannot seem to turn off the light in osg::View.  I can change it
between headlight and sky light, but when I try NO_LIGHT, I still get
the headlight.

 

_viewer-getCamera()-getView()-setLightingMode(osg::View::SKY_LIGHT);
//works

 

_viewer-getCamera()-getView()-setLightingMode(osg::View::HEADLIGHT);
//works

 

_viewer-getCamera()-getView()-setLightingMode(osg::View::NO_LIGHT);
//still get headlight

 

How can I turn off this default light?  How is it related to the
osg::Lights in the scene?  I noticed when I add an osg::Light, then the
headlight is overridden.  How can I change the light parameters of the
SKY_LIGHT or HEADLIGHT?

 

I am using osg version 2.6.

 

Thanks,

-Ben

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Re: [osg-users] osg::View NO_LIGHT bug?

[David Spilling]

Ben,

osg::View's setLightingMode with NO_LIGHT as a parameter doesn't actually
turn any lights off (just look at the source in osg/View.cpp). If the
lightingMode is *not* NO_LIGHT, then it sets light 0 with the default 0.8
diffuse value etc. I presume this is by design, although I'm not sure why!

Actually, this is all a bit confusing. For example, SceneView sets a global
ambient light model that you have to suppress after the fact.

Similarly, I notice that osg/View has LightingMode as enum {NO_LIGHT,
HEADLIGHT, SKY_LIGHT}, whereas SceneView has enum Options {
NO_SCENEVIEW_LIGHT = 0x0, HEADLIGHT = 0x1, SKY_LIGHT = 0x2}, which looks a
little bit... random... to me if any default conversion between the enums is
done. However a quick trawl through SceneView looks okay (LightingMode in
SceneView is typedef'd to Options).

David
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Re: [osg-users] osg::View NO_LIGHT bug?

[Steven Saunderson]

- From: Ben Axelrod at 2009-02-18 07:09-
I
still dont know why osg::View::NO_LIGHT doesnt work, but to answer my own
questions, to turn off the default light completely:
{

 light-setAmbient(osg::Vec4(0,0,0,1));

 light-setDiffuse(osg::Vec4(0,0,0,1));

 light-setSpecular(osg::Vec4(0,0,0,1));

}
Hi Ben,
This is the best solution that I found. I tried the example code
from OSGQSG but it didn't work properly. I appreciate comments here
that it's not ideal because light#0 is wasted but it seems safer than
trying to hijack this light which viewer expects to use.
Any suggestions or clues about taking control of light#0 will be greatly
appreciated.
-- Steven



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