stateSet texture attribute override

Discussion:

Riccardo Corsi

2007-10-02 16:36:47 UTC

Hi all,

I'm after overriding some texture attributes in a hierarchy, following
the osgmultitexture example, from within a "MyTextureSwitcher" node
derived from osg::Group.
I basically want to load a new texture on layer 1 and try to mix/blend
it with the other existing texture on the underlying geometries.
The hierarchy I have is the following:

MyTextureSwitcher
|
MatrixTransform
|
MatrixTransform
|
Geode
|-- geom1
|-- geom2

Now if I try to set the values on the MyTextureSwitcher StateSet,
nothing happen (the new texture file is not even loaded).

If I change the same attributes on the MatrixTrasform instead,
everything works nicely. The attributes I'm adding to override the other
are as well highlighted in the attached image (thanks orhialcon).
Of course, I'd like to do everything in the MyTextureSwitcher stateset,
as this is a node that I can add or remove to obtain different effects.

My code is:

MyTextureSwitcher::Setup()
{
[...]
osg::StateSet* pSS = getChild(0)->getOrCreateStateSet(); // working
case
//osg::StateSet* pSS = getOrCreateStateSet(); // NOT working

pSS->setTextureAttributeAndModes(1, mSwitchTex.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);

osg::TexEnv* texenv = new osg::TexEnv;
texenv->setMode(osg::TexEnv::BLEND);
texenv->setColor(osg::Vec4(0.3f,0.3f,0.3f,0.3f));

pSS->setTextureAttributeAndModes(1,texenv, osg::StateAttribute::ON |
osg::StateAttribute::OVERRIDE);
}

Any clue why the second case is not working?

Thank you,
Ricky

Cedric Pinson

2007-10-02 17:00:41 UTC

Permalink

I thouth the keywords OVERRIDE should be use when you want to override
the Attribute. So i would do something like that:

Switcher:
StateSet - tex0
- tex1
Geode
geom1
stateset - tex0 override
stateset - tex1 override
geom2
stateset - tex0 override
stateset - tex1 override

In this sceme geom 1 et 2 will use for tex0 and tex1 from the switcher

you can read the code here in include/osg/State in the function
State::pushAttributeList
It does not anwser directly to you questions but i hope it will help.

Cedric

Post by Riccardo Corsi
Hi all,
I'm after overriding some texture attributes in a hierarchy, following
the osgmultitexture example, from within a "MyTextureSwitcher" node
derived from osg::Group.
I basically want to load a new texture on layer 1 and try to mix/blend
it with the other existing texture on the underlying geometries.
MyTextureSwitcher
|
MatrixTransform
|
MatrixTransform
|
Geode
|-- geom1
|-- geom2
Now if I try to set the values on the MyTextureSwitcher StateSet,
nothing happen (the new texture file is not even loaded).
If I change the same attributes on the MatrixTrasform instead,
everything works nicely. The attributes I'm adding to override the
other are as well highlighted in the attached image (thanks orhialcon).
Of course, I'd like to do everything in the MyTextureSwitcher
stateset, as this is a node that I can add or remove to obtain
different effects.
MyTextureSwitcher::Setup()
{
[...]
osg::StateSet* pSS = getChild(0)->getOrCreateStateSet(); //
working case
//osg::StateSet* pSS = getOrCreateStateSet(); // NOT working
pSS->setTextureAttributeAndModes(1, mSwitchTex.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::TexEnv* texenv = new osg::TexEnv;
texenv->setMode(osg::TexEnv::BLEND);
texenv->setColor(osg::Vec4(0.3f,0.3f,0.3f,0.3f));
pSS->setTextureAttributeAndModes(1,texenv, osg::StateAttribute::ON
| osg::StateAttribute::OVERRIDE);
}
Any clue why the second case is not working?
Thank you,
Ricky
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Riccardo Corsi

2007-10-02 17:31:36 UTC

Permalink

Hi Cedric,

I believe the override keyword works in the other way: when you use it,
you override the attributes of objects that are below in the graph
hierarchy, for instance in the following scheme:

Switcher:
StateSet - tex0
- tex1 override
Geode
geom1
stateset - tex0
stateset - tex1
geom2
stateset - tex0
stateset - tex1

the tex1 from the Switcher StateSet will be used instead of the one
specified in the geoms.
That's exactly what happens in my application when I do the override in
the MatrixTransform.

Unfortunately, it does not work when I apply the same to the Switcher
stateset, don't know why...

Cheers,
Ricky

Post by Cedric Pinson
I thouth the keywords OVERRIDE should be use when you want to override
StateSet - tex0
- tex1
Geode
geom1
stateset - tex0 override
stateset - tex1 override
geom2
stateset - tex0 override
stateset - tex1 override
In this sceme geom 1 et 2 will use for tex0 and tex1 from the switcher
you can read the code here in include/osg/State in the function
State::pushAttributeList
It does not anwser directly to you questions but i hope it will help.
Cedric

David Spilling

2007-10-03 08:24:39 UTC

Permalink

I've had similar problems due to the optimiser optimising away "empty"
groups that had attached statesets. Are you optimising? If you are, try
outputting the file as .osg and comparing it with and without an optimiser
pass.

David

Post by Riccardo Corsi
Hi Cedric,
I believe the override keyword works in the other way: when you use it,
you override the attributes of objects that are below in the graph
StateSet - tex0
- tex1 override
Geode
geom1
stateset - tex0
stateset - tex1
geom2
stateset - tex0
stateset - tex1
the tex1 from the Switcher StateSet will be used instead of the one
specified in the geoms.
That's exactly what happens in my application when I do the override in
the MatrixTransform.
Unfortunately, it does not work when I apply the same to the Switcher
stateset, don't know why...
Cheers,
Ricky

------------------------------------------------------------------------
------------------------------------------------------------------------

Post by Cedric Pinson

Post by Riccardo Corsi
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Riccardo Corsi

2007-10-03 09:55:22 UTC

Permalink

Hi David,

I'm a total idiot!
I was not optimizing, but I compared the .osg anyway.
The StateSet were doing their job correctly in both cases, but I was
using replaceChild with and index ("0") instead of child pointer... so
the switcher was never inserted in the graph correctly. (RTFM always...)

Thanks for the tip!
Ricky

Post by David Spilling
I've had similar problems due to the optimiser optimising away "empty"
groups that had attached statesets. Are you optimising? If you are,
try outputting the file as .osg and comparing it with and without an
optimiser pass.
David
Hi Cedric,
I believe the override keyword works in the other way: when you use it,
you override the attributes of objects that are below in the graph
StateSet - tex0
- tex1 override
Geode
geom1
stateset - tex0
stateset - tex1
geom2
stateset - tex0
stateset - tex1
the tex1 from the Switcher StateSet will be used instead of the one
specified in the geoms.
That's exactly what happens in my application when I do the override in
the MatrixTransform.
Unfortunately, it does not work when I apply the same to the Switcher
stateset, don't know why...
Cheers,
Ricky

Post by Cedric Pinson
I thouth the keywords OVERRIDE should be use when you want to

override

Post by Cedric Pinson
StateSet - tex0
- tex1
Geode
geom1
stateset - tex0 override
stateset - tex1 override
geom2
stateset - tex0 override
stateset - tex1 override
In this sceme geom 1 et 2 will use for tex0 and tex1 from the

switcher

Post by Cedric Pinson
you can read the code here in include/osg/State in the function
State::pushAttributeList
It does not anwser directly to you questions but i hope it will

help.

Post by Cedric Pinson
Cedric

Post by Riccardo Corsi
Hi all,
I'm after overriding some texture attributes in a hierarchy,

following

Post by Cedric Pinson

Post by Riccardo Corsi
the osgmultitexture example, from within a "MyTextureSwitcher"

node

Post by Cedric Pinson

Post by Riccardo Corsi
derived from osg::Group.
I basically want to load a new texture on layer 1 and try to

mix/blend

Post by Cedric Pinson

Post by Riccardo Corsi
it with the other existing texture on the underlying geometries.
MyTextureSwitcher
|
MatrixTransform
|
MatrixTransform
|
Geode
|-- geom1
|-- geom2
Now if I try to set the values on the MyTextureSwitcher StateSet,
nothing happen (the new texture file is not even loaded).
If I change the same attributes on the MatrixTrasform instead,
everything works nicely. The attributes I'm adding to override the
other are as well highlighted in the attached image (thanks

orhialcon).

Post by Cedric Pinson

Post by Riccardo Corsi
Of course, I'd like to do everything in the MyTextureSwitcher
stateset, as this is a node that I can add or remove to obtain
different effects.
MyTextureSwitcher::Setup()
{
[...]
osg::StateSet* pSS = getChild(0)->getOrCreateStateSet(); //
working case
//osg::StateSet* pSS = getOrCreateStateSet(); // NOT working
pSS->setTextureAttributeAndModes(1, mSwitchTex.get(),
osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);
osg::TexEnv* texenv = new osg::TexEnv;
texenv->setMode(osg::TexEnv::BLEND);
texenv->setColor(osg::Vec4( 0.3f,0.3f,0.3f,0.3f));
pSS->setTextureAttributeAndModes(1,texenv,

osg::StateAttribute::ON

Post by Cedric Pinson

Post by Riccardo Corsi
| osg::StateAttribute::OVERRIDE);
}
Any clue why the second case is not working?
Thank you,
Ricky

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Post by Cedric Pinson

Post by Riccardo Corsi
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Cedric Pinson

2007-10-03 08:24:23 UTC

Permalink

My bad you are right, sorry for the confusion...

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--
+33 (0) 6 63 20 03 56 Cedric Pinson mailto:mornifle-***@public.gmane.org http://www.plopbyte.net