Re: [osg-users] Lightning

[Sebastian Messerschmidt]

Hi Latha,



Hi,
I am working on 'Lighting' to blink lights on a sphere by making 
osg::StateAttribute ON and OFF ,its working fine.But i am
not able to make that sphere itself as light souce(means from sphere light is 
not diffusing,just it is blinking),how to apply different light properties.


If you need the Sphere to be a self-illuminated geometry you need to set 
the emissive-material properties (osg::Material. Alternatively you might 
want to check osgSim::LightPoint.


Cheers
Sebastian


Thank you!

Cheers,
Latha

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Re: [osg-users] Lightning

[Robert Osfield]

Hi Latha,

Have a look at the osglight example.

Robert

On 13 April 2017 at 05:51, Latha Rani Baddala  wrote:
> Hi,
> I am working on 'Lighting' to blink lights on a sphere by making 
> osg::StateAttribute ON and OFF ,its working fine.But i am
> not able to make that sphere itself as light souce(means from sphere light is 
> not diffusing,just it is blinking),how to apply different light properties.
>
> Thank you!
>
> Cheers,
> Latha
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=70758#70758
>
>
>
>
>
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[osg-users] Lightning

[Latha Rani Baddala]

Hi,
I am working on 'Lighting' to blink lights on a sphere by making 
osg::StateAttribute ON and OFF ,its working fine.But i am 
not able to make that sphere itself as light souce(means from sphere light is 
not diffusing,just it is blinking),how to apply different light properties.

Thank you!

Cheers,
Latha

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Re: [osg-users] Lightning problem with camera point of view

[Jonatan]

Hi,

thanks for the help, but it still is not solved. i now generate the plane using 
some for loops that create triangle strips, but the result is the same (even if 
I set the distance between vertices to 1, which creates a ground plane of 2M 
polygons).

any other ideas?

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Re: [osg-users] Lightning problem with camera point of view

[Vincent Bourdier]

Using 3ds max,
applying modifier Edit Normal - Unify, I do not have my old lighting problem.
(exported as .osg file with osgExp from 3ds max 9)

Don't know why this is necessary ... because normals still exist
before I decided to Unify them...

Vincent.

2009/3/2 Jonatan osgfo...@tevs.eu:
 There must be a solution to it. If I load a wavefront file of a plane (4 
 vertices), the lighting works as it should. For now I will use that approach, 
 but still I am wondering what is missing in my plane generation code.

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Re: [osg-users] Lightning problem with camera point of view

[Steven Saunderson]

jonim8or wrote:
 I have the same problem, with lights switching on and off for one shape in my 
 scene.

I have a similar problem in a scene with large flat terrain areas.  When there 
is no vertex in close view it seems that OpenGL can't determine the appropriate 
lighting for the surface and therefore doesn't.  Adding points with normals to 
the large area solves the problem.

HTH,


-- Steven Saunderson

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Re: [osg-users] Lightning problem with camera point of view

[Vincent Bourdier]

Hi,

2009/2/24 Jason Daly jd...@ist.ucf.edu:
 Jean-Sébastien Guay wrote:

 I imagine that any modeling software should have a tool to generate/smooth
 normals. 3DS Max, Blender, Maya, ... It's pretty basic functionality. In
 Creator it's called Calculate Shading, but it may be called something else
 in other modeling software.


 I think 3ds Max calls them smoothing groups.

I think smoothing modifier is just a normal auto-modifier to have a
smooth illusion, but I'm searching at a way to be sure normal are
created and exported in my OSG/IVE model from 3ds max with osgExp

If you have any idea... It would be nice :-)

Thanks

Regards,
   Vincent.


 --J

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Re: [osg-users] Lightning problem with camera point of view

[Jean-Sébastien Guay]

Hi Vincent,


I use 3 lights in the scene, but sometimes there is some lighting strange 
behavior, depending a very little camera orientation change...


From the screenshots I can't say if this is your problem, but I have 
sometimes seen some cases where moving the camera just a little bit 
would make an object flash - i.e. the lighting would be dark then 
light then dark then light.


I have found that this was often caused by the model not having vertex 
normals in it. In my case I would fix it by opening the model in 
MultiGen Creator and using the Calculate Shading tool, which 
calculates vertex normals for the model, and resaving it.


In my case, this problem did not appear when using the fixed pipeline. I 
assume that's because the fixed pipeline can handle cases where the 
model has only face normals just fine, whereas my shaders assumed that 
vertex normals were available, and in the case of some models that 
wasn't true.


Hope this helps,

J-S
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Re: [osg-users] Lightning problem with camera point of view

[Vincent Bourdier]

Hi Jean Sebastien.

I don't know anything about multi gen creator... it is not an OSG plugin
right ?
It a free one ? google give me answers but I don't see anything about a free
product.

Is there any equivalent in OSG ?

Thanks.

Regards,
   Vincent.

2009/2/24 Jean-Sébastien Guay jean-sebastien.g...@cm-labs.com

 Hi Vincent,

  I use 3 lights in the scene, but sometimes there is some lighting strange
 behavior, depending a very little camera orientation change...


 From the screenshots I can't say if this is your problem, but I have
 sometimes seen some cases where moving the camera just a little bit would
 make an object flash - i.e. the lighting would be dark then light then
 dark then light.

 I have found that this was often caused by the model not having vertex
 normals in it. In my case I would fix it by opening the model in MultiGen
 Creator and using the Calculate Shading tool, which calculates vertex
 normals for the model, and resaving it.

 In my case, this problem did not appear when using the fixed pipeline. I
 assume that's because the fixed pipeline can handle cases where the model
 has only face normals just fine, whereas my shaders assumed that vertex
 normals were available, and in the case of some models that wasn't true.

 Hope this helps,

 J-S
 --
 __
 Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com
   http://www.cm-labs.com/
http://whitestar02.webhop.org/
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Re: [osg-users] Lightning problem with camera point of view

[Jean-Sébastien Guay]

Hi Vincent,

I don't know anything about multi gen creator... it is not an OSG plugin 
right ?
It a free one ? google give me answers but I don't see anything about a 
free product.


Is there any equivalent in OSG ?


Hehehe... No, Creator is a 3D modeling software. What I was saying is 
that when a model has bad / inexistent normals, I have to go in the 
modeling software and generate normals for it. In my case, our models 
are in OpenFlight (.flt) format which is the native format of MultiGen 
Creator (which is a de-facto standard in simulation, and which is read 
natively by OSG too) so I use that software, but it was just an example.


Sorry for misleading you...

J-S
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Re: [osg-users] Lightning problem with camera point of view

[Vincent Bourdier]

Ok thanks Jean-Sébastien,

I'll have a look if I have someting to edit/generate normals. maybe 3ds max
can give a good result ...

Thanks for you help :-)

Regards,
   Vincent.

2009/2/24 Jean-Sébastien Guay jean-sebastien.g...@cm-labs.com

 Hi Vincent,

  I don't know anything about multi gen creator... it is not an OSG plugin
 right ?
 It a free one ? google give me answers but I don't see anything about a
 free product.

 Is there any equivalent in OSG ?


 Hehehe... No, Creator is a 3D modeling software. What I was saying is that
 when a model has bad / inexistent normals, I have to go in the modeling
 software and generate normals for it. In my case, our models are in
 OpenFlight (.flt) format which is the native format of MultiGen Creator
 (which is a de-facto standard in simulation, and which is read natively by
 OSG too) so I use that software, but it was just an example.

 Sorry for misleading you...


 J-S
 --
 __
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http://whitestar02.webhop.org/
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Re: [osg-users] Lightning problem with camera point of view

[Jean-Sébastien Guay]

Hi Vincent,

I'll have a look if I have someting to edit/generate normals. maybe 3ds 
max can give a good result ...


I imagine that any modeling software should have a tool to 
generate/smooth normals. 3DS Max, Blender, Maya, ... It's pretty basic 
functionality. In Creator it's called Calculate Shading, but it may be 
called something else in other modeling software.


J-S
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Re: [osg-users] Lightning problem with camera point of view

[Jason Daly]

Jean-Sébastien Guay wrote:
I imagine that any modeling software should have a tool to 
generate/smooth normals. 3DS Max, Blender, Maya, ... It's pretty basic 
functionality. In Creator it's called Calculate Shading, but it may be 
called something else in other modeling software.
  


I think 3ds Max calls them smoothing groups.

--J

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[osg-users] Lightning strike effect

[rvinyard]

Anyone have tips or other thoughts on implementing a lightning strike effect?
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