Re: [osg-users] Correct way to modify scene graph [SEC=UNCLASSIFIED]

[Paul Pocock]

Hi Russell,

I suppose setting the threading model to SingleThreaded is not an 
option, maybe set Root Node to DYNAMIC variance? I can't remember the 
actual call.


good luck,


On 09/11/17 14:49, Thamm, Russell wrote:


*UNCLASSIFIED*

Hi

I am in the process of porting an MFC application from plib to osg.

Currently, if I want to actually modify the scene graph (adding, 
deleting nodes etc) while the render thread is running I do the following:


parentNode->setNodeMask(0);

modify scene graph below parent node

parentNode->setNodeMask(~0);

This seems to work but is there a better way?

Cheers

Russell

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[osg-users] Correct way to modify scene graph [SEC=UNCLASSIFIED]

[Thamm, Russell]

UNCLASSIFIED
Hi

I am in the process of porting an MFC application from plib to osg.

Currently, if I want to actually modify the scene graph (adding, deleting nodes 
etc) while the render thread is running I do the following:

parentNode->setNodeMask(0);
modify scene graph below parent node
parentNode->setNodeMask(~0);

This seems to work but is there a better way?

Cheers
Russell












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Re: [osg-users] TBN Matrix for Normal Mapping - OSG and GLSL

[Rômulo Cerqueira]

Hi Jordi and Sebastian,

thanks for your replies. I will have a look on osg::TangentSpaceVisitor, 
however I have a question: I will have in my OSG scene a lot of objects 
with/without normal mapping. How can I handle different normal textures using 
the same osg::TangentSpaceVisitor?

... 

Thank you!

Cheers,
Rômulo

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Re: [osg-users] [ShaderComposition] Redondant call to useProgram

[Julien Valentin]

Hi Robert,


robertosfield wrote:
> Which version of the OSG are you using?  
> 

I'm talking about master git (haven't check out the branch)

robertosfield wrote:
> Is the standard osgshadercomposition example generating this issue or is it 
> modified version?
> 

Yes, no mod required in the osgshadercomposition example

robertosfield wrote:
> How are you detecting up the redundant calls issue?
> 

I added a test a long time ago in Program.cpp Program::apply( osg::State& state 
) 

Code:
 if( pcp != state.getLastAppliedProgramObject())
{
// for shader debugging: to minimize performance impact,
// optionally validate based on notify level.
// TODO: enable this using notify level, or perhaps its own 
getenv()?
if( osg::isNotifyEnabled(osg::INFO) )
pcp->validateProgram();

pcp->useProgram();
state.setLastAppliedProgramObject(pcp);
}else{
OSG_WARN<<"WARNING: redondant useProgram pcp == 
state.getLastAppliedProgramObject()"< Hi Julien,
> 
> I can't provide an answers without digging deeply in the code, this
> week I'm really busy with clients so can't look in to.  Next week I'll
> be getting back to the shader_pipeline branch and better able to look
> into it.
> 
> Which version of the OSG are you using?  Is the standard
> osgshadercomposition example generating this issue or is it modified
> version?  How are you detecting up the redundant calls issue?
> 
> Robert.
> 
> On 4 November 2017 at 18:03, Julien Valentin <> wrote:
> 
> > Hi Robert,
> > 
> > Using the new shader composition (ex osgshadercompostion), I was surprised 
> > to detect a lot of redondant call to gluseprogram...
> > I debugged a few and don't understand well State::push/popDefine and its 
> > policy to invalidate defineMap (defineMap.changed = true; seams to be 
> > called at each push/pop)
> > (It's difficult to interact since it' s in the header)
> > 
> > The problem seams here since it always tags as changed definemap (and so 
> > lead to some useless passage in State.cpp line 672
> > 
> > 
> > Code:
> > if ((_lastAppliedProgramObject!=0) && 
> > (previousLastAppliedProgramObject==_lastAppliedProgramObject) && 
> > _defineMap.changed)
> > {
> > // OSG_NOTICE<<"State::apply(StateSet*) Program already applied 
> > ("<<(previousLastAppliedProgramObject==_lastAppliedProgramObject)<<") and 
> > _defineMap.changed= "<<_defineMap.changed< > _lastAppliedProgramObject->getProgram()->apply(*this);
> > }
> > 
> > 
> > 
> > Hoping this helps you to diagnose the problem :/
> > 
> > Thank you!
> > 
> > Cheers,
> > Julien
> > 
> > --
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> > http://forum.openscenegraph.org/viewtopic.php?p=72306#72306
> > 
> > 
> > 
> > 
> > 
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Re: [osg-users] osgoculus viewer picking

[Björn Blissing]

mmaurus wrote:
> No, I actually mean eyetracking!
> I have an integrated eyetracker.
> 


Nice!

Ok.. Well then you have to add the eyetracking rotations on top of the head 
rotations. 

Regards
Björn

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Re: [osg-users] osgoculus viewer picking

[Björn Blissing]

Hi again,

I do not know which version of the OsgOculusViewer you are currently using. I 
just checked my own code and the OculusDevice class have had public interfaces 
to both head position and orientation since 3 years back (SDK version 0.4.2).

Regards,
Björn

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Re: [osg-users] osgoculus viewer picking

[Michael Maurus]

No, I actually mean eyetracking!
I have an integrated eyetracker.

Cheers,
Michael

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Re: [osg-users] osgoculus viewer picking

[Björn Blissing]

Hi Michael,

I guess you mean head tracking and not eye tracking.

But that should be fairly straight forward. Create a line segment emanating 
from a point between the eyes and use that to calculate the intersections. 
There is no need to go from 2D to 3D in this case. The only thing you need to 
do is to recover the head position and orientation from the OculusDevice class. 
Either by writing your own method that publish that data directly from the 
Oculus SDK or by recovering that from the view matrices (which already have a 
public interface in the OculusDevice class).

Regards,
Björn

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Re: [osg-users] osgoculus viewer picking

[Michael Maurus]

Hi Björn,

thanks for the reply.
I only have the DK2 without the controllers.
Actually, I want to do picking using eyetracking.
There I also get window coordinate and therefore need the same intersection 
methods.

So if I unterstood you correctly, setting up a valid master camera, the picking 
should work? What is missing for that?
Can I disable the oculus display and display just the scene?

Cheers,
Michael

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Re: [osg-users] osgoculus viewer picking

[Björn Blissing]

Hi Michael,

The OsgOculusViewer only renders to textures. What you see on your normal 
monitor is mirrored through the facilities provided by the Oculus SDK. I really 
do not know how mouse events are propagated through this window back to the osg 
application.

The second assumption your code makes is that it assumes that there is a valid 
camera connected to the view. OsgOculusViewer uses a master-slave 
configuration, where the master view do not contain a valid camera object. 
Instead it is the slave cameras that is responsible for all rendering. 

A more esoteric question is: Do you really want mouse picking abilities when 
you are using a HMD? Shouldn't you be using the Oculus Touch capabilities for 
object picking inside VR instead?


Regards,
Björn

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[osg-users] osgoculus viewer picking

[Michael Maurus]

Hi,

how can I get my PickHandler edited from the osgpick (see attachment) example 
working inside the osgoculusviewer?

Cheers,
Michael

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// class to handle events with a pick
class PickHandler : public osgGA::GUIEventHandler {
public:

PickHandler() {}

~PickHandler() {}

bool handle(const osgGA::GUIEventAdapter& ea,osgGA::GUIActionAdapter& aa) {
switch(ea.getEventType())
{
case(osgGA::GUIEventAdapter::PUSH):
{
osgViewer::View* view = dynamic_cast();
if (view) pick(view,ea);
return false;
}
case(osgGA::GUIEventAdapter::KEYDOWN):
{
if (ea.getKey()=='c')
{
osgViewer::View* view = dynamic_cast();
osg::ref_ptr event = new 
osgGA::GUIEventAdapter(ea);
event->setX((ea.getXmin()+ea.getXmax())*0.5);
event->setY((ea.getYmin()+ea.getYmax())*0.5);
if (view) pick(view,*event);
}
return false;
}
default:
return false;
}
}

virtual void pick(osgViewer::View* view, const osgGA::GUIEventAdapter& ea) {
osgUtil::LineSegmentIntersector::Intersections intersections;

std::string gdlist="";

osg::ref_ptr cam = view->getCamera();
std::cout << "mouse coordinates: " << ea.getX() << ", " << ea.getY() << 
", camera = " << cam->getName() << std::endl;

if (view->computeIntersections(ea,intersections))
{
for(osgUtil::LineSegmentIntersector::Intersections::iterator hitr = 
intersections.begin();
hitr != intersections.end();
++hitr)
{
std::ostringstream os;
if (!hitr->nodePath.empty() && 
!(hitr->nodePath.back()->getName().empty()))
{
// the geodes are identified by name.
os<<"Object 
\""getName()<<"\""<drawable.valid())
{
os<<"Object 
\""className()<<"\""<getLocalIntersectPoint()<<")"<<"  
normal("getWorldIntersectPoint()<<")"<<"  
normal("indexList;
for(unsigned int i=0;i[osg-users] Osg 3.4.1 - Tutorial 12 Fails on Mac OSX Sierra - Framebuffer problem


2017-11-08

Thread
Jeff Sprenger

I have just built 3.4.1 from github on the mac (MacOS Sierra, 10.12.6). The 
early tutorials Tut2 etc work fine.  Tutorial 12, which introduces shadows, 
runs but dumps out warning messages. No shadows appear.

here is the console output:


Code:

StatsHandler::StatsHandler() Setting up GL2 compatible shaders
Warning: FrameBufferObject: could not create the FBO
RenderStage::runCameraSetUp(), FBO setup failed, FBO status= 0x0
FRAGMENT glCompileShader "" FAILED
glLinkProgram 0x7fb62e676ea0"" FAILED
Warning: FrameBufferObject: could not create the FBO
RenderStage::runCameraSetUp(), FBO setup failed, FBO status= 0x0




How to I fix or investigate the problem with failing to create the FBO?
[/code]

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Re: [osg-users] MFC mdi child windows show the scene with different lighting


2017-11-08

Thread
Lincoln Nxumalo

Hi Rakesh,

If you are not willing to put in the effort to reproduce the scenario then 
maybe you don't really want help.
... 

Cheers,
Lincoln

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Re: [osg-users] MFC mdi child windows show the scene with different lighting


2017-11-08

Thread
Lincoln Nxumalo

Hi Rakesh,

If you want us to help you please reproduce the scenario by posting a minimal 
project (like modifying the MFC example) like I asked you to. The sooner you do 
that the sooner you will get help. Any other attempt like posting log files you 
are really just wasting time.
... 

Thank you!

Cheers,
Lincoln

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Re: [osg-users] TBN Matrix for Normal Mapping - OSG and GLSL


2017-11-08

Thread
Jordi Torres

Ouch bad link:

https://github.com/openscenegraph/OpenSceneGraph/blob/master/src/osgPlugins/gles/TangentSpaceVisitor.cpp#L46

this one is the right one!

2017-11-08 9:19 GMT+01:00 Jordi Torres :

> Hi Romulo,
>
> You can use TangentSpaceGenerator to get the values of the T B and N. Here
> you have a code example: https://github.com/sketchfab/osg/blob/
> 5d35b2a2d55e92b4c736ea5edcd9eeedf9ea6786/src/osgPlugins/
> gles/TangentSpaceVisitor.cpp#L46
>
> Cheers.
>
> 2017-11-07 21:48 GMT+01:00 Rômulo Cerqueira :
>
>> Hi,
>>
>> I have used normal mapping using GLSL and OSG for my application (an
>> imaging sonar simulation) and I got problems by calculating the TBN matrix
>> on shaders. The normal vectors contain lower resolution on border in
>> comparison with the center of image.
>>
>> Follows my vertex code:
>>
>> Code:
>>
>> #version 130
>>
>> out vec3 pos;
>> out vec3 normal;
>> out mat3 TBN;
>>
>> void main() {
>> pos = (gl_ModelViewMatrix * gl_Vertex).xyz;
>> normal = gl_NormalMatrix * gl_Normal.xyz;
>>
>> vec3 n = normalize(normal);
>> vec3 t = normalize(cross(normal, vec3(-1,0,0)));
>> vec3 b = cross(t, n) + cross(n, t);
>> TBN = transpose(mat3(t,b,n));
>>
>> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
>> gl_TexCoord[0] = gl_MultiTexCoord0;
>> }
>>
>>
>>
>>
>> Part of my fragment code:
>>
>> Code:
>>
>> #version 130
>>
>> in vec3 pos;
>> in vec3 normal;
>> in mat3 TBN;
>> uniform sampler2D normalTexture;
>>
>> void main() {
>> vec3 newNormal = (texture2D(normalTexture, gl_TexCoord[0].st).rgb *
>> 2.0 - 1) * TBN;
>> newNormal = normalize(newNormal);
>> ...
>> }
>>
>>
>>
>>
>> The resulting figure is attached.
>>
>> How can I calculate the TBN matrix to compute the normal mapping properly?
>>
>> Thanks in advance,
>>
>>
>> ...
>>
>> Thank you!
>>
>> Cheers,
>> Rômulo[/img]
>>
>> --
>> Read this topic online here:
>> http://forum.openscenegraph.org/viewtopic.php?p=72324#72324
>>
>>
>>
>>
>> Attachments:
>> http://forum.openscenegraph.org//files/screenshot_from_2017_
>> 11_06_23_00_48_832.png
>>
>>
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>
>
>
> --
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>
>
>


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Re: [osg-users] TBN Matrix for Normal Mapping - OSG and GLSL


2017-11-08

Thread
Jordi Torres

Hi Romulo,

You can use TangentSpaceGenerator to get the values of the T B and N. Here
you have a code example:
https://github.com/sketchfab/osg/blob/5d35b2a2d55e92b4c736ea5edcd9eeedf9ea6786/src/osgPlugins/gles/TangentSpaceVisitor.cpp#L46

Cheers.

2017-11-07 21:48 GMT+01:00 Rômulo Cerqueira :

> Hi,
>
> I have used normal mapping using GLSL and OSG for my application (an
> imaging sonar simulation) and I got problems by calculating the TBN matrix
> on shaders. The normal vectors contain lower resolution on border in
> comparison with the center of image.
>
> Follows my vertex code:
>
> Code:
>
> #version 130
>
> out vec3 pos;
> out vec3 normal;
> out mat3 TBN;
>
> void main() {
> pos = (gl_ModelViewMatrix * gl_Vertex).xyz;
> normal = gl_NormalMatrix * gl_Normal.xyz;
>
> vec3 n = normalize(normal);
> vec3 t = normalize(cross(normal, vec3(-1,0,0)));
> vec3 b = cross(t, n) + cross(n, t);
> TBN = transpose(mat3(t,b,n));
>
> gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
> gl_TexCoord[0] = gl_MultiTexCoord0;
> }
>
>
>
>
> Part of my fragment code:
>
> Code:
>
> #version 130
>
> in vec3 pos;
> in vec3 normal;
> in mat3 TBN;
> uniform sampler2D normalTexture;
>
> void main() {
> vec3 newNormal = (texture2D(normalTexture, gl_TexCoord[0].st).rgb *
> 2.0 - 1) * TBN;
> newNormal = normalize(newNormal);
> ...
> }
>
>
>
>
> The resulting figure is attached.
>
> How can I calculate the TBN matrix to compute the normal mapping properly?
>
> Thanks in advance,
>
>
> ...
>
> Thank you!
>
> Cheers,
> Rômulo[/img]
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=72324#72324
>
>
>
>
> Attachments:
> http://forum.openscenegraph.org//files/screenshot_from_
> 2017_11_06_23_00_48_832.png
>
>
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Re: [osg-users] TBN Matrix for Normal Mapping - OSG and GLSL


2017-11-08

Thread
Sebastian Messerschmidt




Hi Rômulo,


Hi,

I have used normal mapping using GLSL and OSG for my application (an imaging 
sonar simulation) and I got problems by calculating the TBN matrix on shaders. 
The normal vectors contain lower resolution on border in comparison with the 
center of image.


You cannot get a valid Co-TangentSpace by taking only the normal into 
account considering arbitrary geometries. There are multiple ways to 
tackle this however:
First is to calculate the mesh's tangentspace beforehand and pass the 
tangent and binormal via vertex attributes.
See the osgUtil::TangentSpaceGenerator (example in the osg::CookBook 
AFAIK).


Second one is to calculate it in the view-space. Beware of dragons, 
since the precision will be awful for big coordinates:


http://www.thetenthplanet.de/archives/1180

hth
Sebastian



Follows my vertex code:

Code:

#version 130

out vec3 pos;
out vec3 normal;
out mat3 TBN;

void main() {
 pos = (gl_ModelViewMatrix * gl_Vertex).xyz;
 normal = gl_NormalMatrix * gl_Normal.xyz;

 vec3 n = normalize(normal);
 vec3 t = normalize(cross(normal, vec3(-1,0,0)));
 vec3 b = cross(t, n) + cross(n, t);
 TBN = transpose(mat3(t,b,n));

 gl_Position = gl_ModelViewProjectionMatrix * gl_Vertex;
 gl_TexCoord[0] = gl_MultiTexCoord0;
}




Part of my fragment code:

Code:

#version 130

in vec3 pos;
in vec3 normal;
in mat3 TBN;
uniform sampler2D normalTexture;

void main() {
 vec3 newNormal = (texture2D(normalTexture, gl_TexCoord[0].st).rgb * 2.0 - 
1) * TBN;
 newNormal = normalize(newNormal);
...
}




The resulting figure is attached.

How can I calculate the TBN matrix to compute the normal mapping properly?

Thanks in advance,


...

Thank you!

Cheers,
Rômulo[/img]

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