Re: [osg-users] Selective ClipNode

[Ale Maro]

Thank you Sebastian,

I also found another way that is useful in my case.
I simply call the following code for each node I want to exclude from clipping:

node->getOrCreateStateSet()->setMode(GL_CLIP_PLANE0, osg::StateAttribute::OFF | 
osg::StateAttribute::PROTECTED);

Ale

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Re: [osg-users] Selective ClipNode

[Sebastian Messerschmidt]

Am 4/18/2017 um 2:17 PM schrieb Ale Maro:

Hi Sebastian,

I would like to avoid that becouse each node may have complex (dynamic) 
transformations so I should traverse the scene, calculate the global 
transformation for each node and update each transformation for the children of 
the sibling-group
Sorry I don't understand what you mean. If you simply put (at the top 
level) parts like this:


SCENE
|-CLIP
|-Childs
|-NON_CLIP  
|-Childs

the childs in this example can have arbitary transformations...
If you cannot place your nodes like this, you can take a look at the 
ClipNode-implementation and maybe inherit and change the parts that 
control the clipping state to set it effectively per child somehow.


The other option is to simply use a shader that implements the clipping 
and to switch it on/off via uniform.


Cheers
Sebastian




Ale

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Re: [osg-users] Related to osg lines

[Rambabu Repaka]

Hi, Iam using the following code and drawing the lines in osg and clamping the 
lines to the terrain for the purpose of road drawing

LineSymbol* line = style.getOrCreate();
line->stroke()->color() = Color(Color::Black, 0.5f);
line->stroke()->width() = 8.0f;
line->tessellationSize() = 5;
line->stroke()->widthUnits() = Units::METERS;

   AltitudeSymbol* alt = style.getOrCreate();
alt->clamping() = alt->CLAMP_TO_TERRAIN;

   But for me i want road with texture so what iam 
   adding the quad and applying texture in the below code

   osg::ref_ptr vertices = new osg::Vec3Array;
vertices->push_back(osg::Vec3(-1.0f,0.0f,-2.0f));
vertices->push_back(osg::Vec3(1.0f,0.0f,-2.0f));
vertices->push_back(osg::Vec3(1.0f,0.0f,2.0f));
vertices->push_back(osg::Vec3(-1.0f,0.0f,2.0f));

osg::ref_ptr normals = new osg::Vec3Array;
normals->push_back(osg::Vec3(0.0f,-1.0f,0.0f));

osg::ref_ptr colors = new osg::Vec4Array;
colors->push_back(osg::Vec4(0.0f, 0.0f, 0.0f,0.0f));
   
osg::ref_ptr texcoords = new osg::Vec2Array;
texcoords->push_back(osg::Vec2(0.0f, 0.0f));
texcoords->push_back(osg::Vec2(0.0f, 1.0f));
texcoords->push_back(osg::Vec2(1.0f, 1.0f));
texcoords->push_back(osg::Vec2(1.0f, 0.0f));

osg::ref_ptr geom = new osg::Geometry;
geom->setVertexArray(vertices.get());
geom->setNormalArray(normals.get());
geom->setColorArray(colors.get());
geom->setNormalBinding(osg::Geometry::BIND_OVERALL);
geom->setTexCoordArray(0,texcoords.get());
geom->setColorBinding(osg::Geometry::BIND_OVERALL);
geom->addPrimitiveSet(new osg::DrawArrays(GL_QUADS,0,4));

osg::ref_ptr texture = new osg::Texture2D;
texture->setWrap(osg::Texture2D::WRAP_S,  
osg::Texture2D::CLAMP); 
 
texture->setWrap(osg::Texture2D::WRAP_T, 
osg::Texture2D::CLAMP);
osg::ref_ptr image = 
osgDB::readImageFile("D:/Images/roadPic.jpg");
texture->setImage(image);
   
osg::ref_ptr root = new osg::Geode;
root->addDrawable(geom.get());
  
root->getOrCreateStateSet()->setTextureAttributeAndModes(0,texture.get());

 how to clamp the quad to the terrain  for drawing the road in osgearth  or any 
other way to add the texture to those lines? 




... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] Selective ClipNode

[Sebastian Messerschmidt]

Hi Ale,


in my scene graph I have a root node of type osg::ClipNode.
In this way I can add easily clipping planes to my scene. This works fine.

Now I would like to exclude some nodes from clipping. I wonder if ClipNode 
supports something like a visitor mask to selectively apply clipping to 
children.
You can always put the nodes to be excluded from clipping into a 
sibling-group of the ClipNode.


Cheers
Sebastian


Thank you in advance.

Best regards
Ale

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[osg-users] Selective ClipNode

[Ale Maro]

Hi,

in my scene graph I have a root node of type osg::ClipNode. 
In this way I can add easily clipping planes to my scene. This works fine.

Now I would like to exclude some nodes from clipping. I wonder if ClipNode 
supports something like a visitor mask to selectively apply clipping to 
children.

Thank you in advance.

Best regards
Ale

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Re: [osg-users] Related to osg lines

[龚来恩]

Hi,
I think LineSymbol class has no this kind of function. Maybe you could use 
osg to do it.

Glen


8802...@qq.com
 
From: Rambabu Repaka
Date: 2017-04-18 17:53
To: osg-users
Subject: Re: [osg-users] Related to osg lines
Hi,In osgearth project  linesymbol is using  and drawing the road but i want to 
add the texture to those lines,Normally how to add texture to the line in osg ?
 
... 
 
Thank you!
 
Cheers,
Rambabu
 
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Re: [osg-users] Related to osg lines

[Rambabu Repaka]

Hi,In osgearth project  linesymbol is using  and drawing the road but i want to 
add the texture to those lines,Normally how to add texture to the line in osg ?

... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] Related to osg lines

[龚来恩]

Hello,
I saw these codes in OSGEarth project.

Glen



8802...@qq.com
 
From: Robert Osfield
Date: 2017-04-18 17:26
To: OpenSceneGraph Users
Subject: Re: [osg-users] Related to osg lines
On 18 April 2017 at 10:22, Rambabu Repaka  wrote:
> Hi,Iam drawing lines using the following code in osg
>  LineSymbol* line = style.getOrCreate();
>  line->stroke()->color() = Color(Color::Black, 0.5f);
>  line->stroke()->width() = 4.5f;
>  line->tessellationSize() = 5;
>  line->stroke()->widthUnits() = Units::METERS;
> How to add texture image to these Lines ?
 
The OSG does not have any class called LineSymbol, so I can't see how
it's related ot the OSG.
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Re: [osg-users] Related to osg lines

[Robert Osfield]

On 18 April 2017 at 10:22, Rambabu Repaka  wrote:
> Hi,Iam drawing lines using the following code in osg
>  LineSymbol* line = style.getOrCreate();
>  line->stroke()->color() = Color(Color::Black, 0.5f);
>  line->stroke()->width() = 4.5f;
>  line->tessellationSize() = 5;
>  line->stroke()->widthUnits() = Units::METERS;
> How to add texture image to these Lines ?

The OSG does not have any class called LineSymbol, so I can't see how
it's related ot the OSG.
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[osg-users] Related to osg lines

[Rambabu Repaka]

Hi,Iam drawing lines using the following code in osg 
 LineSymbol* line = style.getOrCreate();
 line->stroke()->color() = Color(Color::Black, 0.5f);
 line->stroke()->width() = 4.5f;
 line->tessellationSize() = 5;
 line->stroke()->widthUnits() = Units::METERS;
How to add texture image to these Lines ?


... 

Thank you!

Cheers,
Rambabu

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Re: [osg-users] Fast move a lot of nodes to another group

[Sebastian Messerschmidt]

Am 4/15/2017 um 6:24 PM schrieb Yura Ivanov:

Hi,

I created stateset with bool uniform to indicate that node is selected and mat 
uniform with current mouse transform. To select nodes, I set this uniforms to 
nodes and all transformation preforms in shader. On mouse release, all 
transform applies to nodes by calling setMatrix and mat uniform sets to 
identity. Everything works fast and after all I don’t have extra nodes and 
statesets. Maybe my approach in this task is wrong, but many editors, for 
example 3dsMax, can work with big number of objects. And bad structure of scene 
in this case is user problem.
Thank you very much, especially for optimize.


This will disable "native" picking of the nodes however. Also I wonder 
why this should be more efficient than putting every node under a 
transform in the first place.
What you're doing is effectively a poor implementation of instancing. A 
better approach (if you want to use the uniform approach) is to setup a 
uniform buffer object (see [0]) containing the matrices and to use the 
draw-instanced version of your geometry to fetch it based on its 
gl_InstanceId. A version that scales better is to use a texture object 
to hold the matrices (see [1])



[0]
http://3dcgtutorials.blogspot.de/2013/09/instancing-with-openscenegraph-part-ii.html

[1]
http://3dcgtutorials.blogspot.de/2013/08/instancing-with-openscenegraph.html

Cheers
Sebastian



Cheers,
Yura

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Re: [osg-users] Scale problem while transforming object in vertex shader

[Sebastian Messerschmidt]

Hi Yura

Hi,

I have a transform matrix and I want to apply it in shader. I pass it into 
uniform and set gl_Position = 
gl_ModelViewProjectionMatrix*my_transfrom_matrix*gl_Vertex.
If I set translate only, everything is ok. If I set translate and scale - 
translate multiplies by scale and transform is wrong (object is too far if 
scale>1.0). If I apply this transform not using shader (by SetMatrix) 
everything is ok. What I am doing wrong?

Matrix multiplication is not cummutative in every case.
Try
gl_Position = gl_ModelViewMatrix * matrix * gl_ProjectionMatrix * 
gl_Vertex.


Cheers
Sebastian



Thank you!

Cheers,
Yura

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