Re: [osg-users] Disappearing text

[Ronny Hatteland]

robertosfield wrote:
> Hi Ronny,
> 
> 
> Where the problem lies will likely be how you are managing the viewer as well 
> as the graphics context.  My hunch is that you've created the problem with 
> your "custom" means of managing things.
> 
> 
> If you can try running your application with a straight osgViewer::Viewer 
> with it creating a single window for you rather than hand wiring things 
> yourself, even if this doesn't give you exactly what you want for your final 
> application it will at least give you a sanity test to compare results 
> against.  If this works then you know that the issue stems from your won 
> custom set up.
> 
> While it possible to hand wire things up it's more complicated with more 
> options for screwing things up if your don't know how all the various 
> elements fully work together.
> 
> 
> Robert.

Thanks for the feedback, I will try to do that.

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Re: [osg-users] Disappearing text

[Robert Osfield]

Hi Ronny,

Where the problem lies will likely be how you are managing the viewer as
well as the graphics context.  My hunch is that you've created the problem
with your "custom" means of managing things.

If you can try running your application with a straight osgViewer::Viewer
with it creating a single window for you rather than hand wiring things
yourself, even if this doesn't give you exactly what you want for your
final application it will at least give you a sanity test to compare
results against.  If this works then you know that the issue stems from
your won custom set up.

While it possible to hand wire things up it's more complicated with more
options for screwing things up if your don't know how all the various
elements fully work together.

Robert.



On 18 April 2016 at 16:30, Ronny Hatteland  wrote:

>
> > That should not be needed at all, and indicative that something
> somewhere in your application or it's usage of the OSG is messing up the GL
> object management.
> >
> >
> > The resizeGLObjbectBuffer() is only needed when graphics context are
> created or destroyed.
> >
> >
> >
> > As to what is going wrong your case I can't say - something *very* odd
> is happening.  Are you creating your own graphics context / modifying the
> viewer?
> >
> >
> > Robert.
>
>
> Yes I am creating my own GraphicsContext:
>
> Code:
> // Local Variable to hold window size data
> RECT rect;
>
> // Get the current window size
> ::GetWindowRect(m_hWnd, );
>
> // Init the GraphicsContext Traits
> osg::ref_ptr traits = new
> osg::GraphicsContext::Traits;
>
> // Init the Windata Variable that holds the handle for the Window to
> display OSG in.
> osg::ref_ptr windata = new
> osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);
>
> // Setup the traits parameters
> traits->x = 0;
> traits->y = 0;
> traits->width = (rect.right - rect.left);
> traits->height = ( rect.bottom - rect.top);
>
> traits->windowDecoration = true; // CHECK DIFFERENCE
> traits->doubleBuffer = false;
> traits->setInheritedWindowPixelFormat = true;
> traits->inheritedWindowData = windata;
> traits->samples = samples;
> traits->vsync = false;
> GraphicsContext* gc =
> osg::GraphicsContext::createGraphicsContext(traits.get());
> traits->x = 0;
> traits->y = 0;
> return gc;
>
>
> which afterwards is used as follows:
>
>
> Code:
> m_defaultGraphicsContext->clear();
>
> m_defaultGraphicsContext->setName("DefaultViewGraphicsContext");
> m_defaultGraphicsContext->getState()->setUseModelViewAndProjectionUniforms(true);
> //ADDED FOR SHADER
> m_defaultGraphicsContext->getState()->setUseVertexAttributeAliasing(true);
>
> if (m_defaultGraphicsContext->valid())
> {
> defaultCamera = mViewer->getCamera();
> defaultCamera->setCullMask(0x04);
> defaultCamera->getOrCreateStateSet()->setMode(GL_LIGHTING,
> osg::StateAttribute::OFF );
>
> defaultCamera->getOrCreateStateSet()->setMode(osg::StateAttribute::SCISSOR
> , osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
>
> defaultCamera->getOrCreateStateSet()->removeAttribute(osg::StateAttribute::MATERIAL);
> defaultCamera->getView()->setLightingMode(osg::View::NO_LIGHT);
> defaultCamera->setGraphicsContext(m_defaultGraphicsContext);
> defaultCamera->setViewport(new
> osg::Viewport(m_defaultGraphicsContext->getTraits()->x,
> m_defaultGraphicsContext->getTraits()->y,
> m_defaultGraphicsContext->getTraits()->width,
> m_defaultGraphicsContext->getTraits()->height));
> }
>
> double fovy, aspectRatio;
>
> mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio,
> defaultCameraNear, defaultCameraFar);
> aspectRatio = double(m_defaultGraphicsContext->getTraits()->width) /
> double(m_defaultGraphicsContext->getTraits()->height);
> mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy, aspectRatio,
> 0.01f, defaultCameraFar);
>
> initOpenGL(m_defaultGraphicsContext, maxNumUniforms, maxUniformBlockSize);
>
>
>
>
> Code:
>
> void initOpenGL(osg::ref_ptr context, GLint&
> maxNumUniforms, GLint& maxUniformBlockSize) {
> context->realize();
> context->makeCurrent();
> maxNumUniforms = 0;
> glGetIntegerv(GL_MAX_VERTEX_UNIFORM_COMPONENTS, );
> maxUniformBlockSize = 0;
> glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, );
>
> // init glew
> ///glewExperimental = GL_TRUE;
> /// if (GLEW_ARB_vertex_buffer_object == FALSE ||
> GLEW_ARB_vertex_array_object == FALSE) return;
> #ifdef USE_INSTANCED_DRAWING
> glewInit();
> #endif
> context->releaseContext();
>
> // ATI driver 11.6 didn't return right number of uniforms which
> lead to a crash, when the vertex shader was compiled(WTF?!)
> #ifdef ATI_FIX
> maxNumUniforms  = 576;
> maxUniformBlockSize = 16384;
> #endif
> }
>
>
>
> Maybe you can spot something that is clearly wrong here, otherwise it
> could be related to the glewInit()?
>
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Re: [osg-users] Disappearing text

[Ronny Hatteland]

> That should not be needed at all, and indicative that something somewhere in 
> your application or it's usage of the OSG is messing up the GL object 
> management. 
> 
> 
> The resizeGLObjbectBuffer() is only needed when graphics context are created 
> or destroyed.  
> 
> 
> 
> As to what is going wrong your case I can't say - something *very* odd is 
> happening.  Are you creating your own graphics context / modifying the viewer?
> 
> 
> Robert.


Yes I am creating my own GraphicsContext:

Code:
// Local Variable to hold window size data
RECT rect;

// Get the current window size
::GetWindowRect(m_hWnd, );

// Init the GraphicsContext Traits
osg::ref_ptr traits = new 
osg::GraphicsContext::Traits;

// Init the Windata Variable that holds the handle for the Window to display 
OSG in.
osg::ref_ptr windata = new 
osgViewer::GraphicsWindowWin32::WindowData(m_hWnd);

// Setup the traits parameters
traits->x = 0;
traits->y = 0;
traits->width = (rect.right - rect.left);
traits->height = ( rect.bottom - rect.top);

traits->windowDecoration = true; // CHECK DIFFERENCE
traits->doubleBuffer = false;
traits->setInheritedWindowPixelFormat = true;
traits->inheritedWindowData = windata;
traits->samples = samples;
traits->vsync = false;
GraphicsContext* gc = osg::GraphicsContext::createGraphicsContext(traits.get());
traits->x = 0;
traits->y = 0;
return gc;


which afterwards is used as follows:


Code:
m_defaultGraphicsContext->clear();

m_defaultGraphicsContext->setName("DefaultViewGraphicsContext");
m_defaultGraphicsContext->getState()->setUseModelViewAndProjectionUniforms(true);
 //ADDED FOR SHADER
m_defaultGraphicsContext->getState()->setUseVertexAttributeAliasing(true); 

if (m_defaultGraphicsContext->valid())
{
defaultCamera = mViewer->getCamera();
defaultCamera->setCullMask(0x04);
defaultCamera->getOrCreateStateSet()->setMode(GL_LIGHTING, 
osg::StateAttribute::OFF );

defaultCamera->getOrCreateStateSet()->setMode(osg::StateAttribute::SCISSOR , 
osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);

defaultCamera->getOrCreateStateSet()->removeAttribute(osg::StateAttribute::MATERIAL);
defaultCamera->getView()->setLightingMode(osg::View::NO_LIGHT);
defaultCamera->setGraphicsContext(m_defaultGraphicsContext);
defaultCamera->setViewport(new 
osg::Viewport(m_defaultGraphicsContext->getTraits()->x, 
m_defaultGraphicsContext->getTraits()->y, 
m_defaultGraphicsContext->getTraits()->width, 
m_defaultGraphicsContext->getTraits()->height));
}

double fovy, aspectRatio;

mViewer->getCamera()->getProjectionMatrixAsPerspective(fovy, aspectRatio, 
defaultCameraNear, defaultCameraFar);
aspectRatio = double(m_defaultGraphicsContext->getTraits()->width) / 
double(m_defaultGraphicsContext->getTraits()->height);
mViewer->getCamera()->setProjectionMatrixAsPerspective(fovy, aspectRatio, 
0.01f, defaultCameraFar); 

initOpenGL(m_defaultGraphicsContext, maxNumUniforms, maxUniformBlockSize);




Code:

void initOpenGL(osg::ref_ptr context, GLint& 
maxNumUniforms, GLint& maxUniformBlockSize) {
context->realize();
context->makeCurrent();
maxNumUniforms = 0;
glGetIntegerv(GL_MAX_VERTEX_UNIFORM_COMPONENTS, );
maxUniformBlockSize = 0;
glGetIntegerv(GL_MAX_UNIFORM_BLOCK_SIZE, );

// init glew
///glewExperimental = GL_TRUE;
/// if (GLEW_ARB_vertex_buffer_object == FALSE || 
GLEW_ARB_vertex_array_object == FALSE) return;
#ifdef USE_INSTANCED_DRAWING
glewInit();
#endif
context->releaseContext();

// ATI driver 11.6 didn't return right number of uniforms which lead to 
a crash, when the vertex shader was compiled(WTF?!)
#ifdef ATI_FIX
maxNumUniforms  = 576;
maxUniformBlockSize = 16384;
#endif
}



Maybe you can spot something that is clearly wrong here, otherwise it could be 
related to the glewInit()?

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Re: [osg-users] Disappearing text

[Robert Osfield]

Hi Ronny,

On 18 April 2016 at 15:29, Ronny Hatteland  wrote:

> The issue was fixed using the following after every ->setText():
>
>
> Code:
>
> mViewer->getSceneData()->resizeGLObjectBuffers(osg::DisplaySettings::instance()->getMaxNumberOfGraphicsContexts());
>
>
> which is called inside of setSceneData(). However, this obviously has a
> huge performance impact and I cannot do this on mouse move. Any suggestions?
>

That should not be needed at all, and indicative that something somewhere
in your application or it's usage of the OSG is messing up the GL object
management.

The resizeGLObjbectBuffer() is only needed when graphics context are
created or destroyed.


As to what is going wrong your case I can't say - something *very* odd is
happening.  Are you creating your own graphics context / modifying the
viewer?

Robert.
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Re: [osg-users] Disappearing text

[Ronny Hatteland]

The issue was fixed using the following after every ->setText():


Code:
mViewer->getSceneData()->resizeGLObjectBuffers(osg::DisplaySettings::instance()->getMaxNumberOfGraphicsContexts());


which is called inside of setSceneData(). However, this obviously has a huge 
performance impact and I cannot do this on mouse move. Any suggestions?

Thank you!

Cheers,
Ronny

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Re: [osg-users] Disappearing text

[Robert Osfield]

Hi Ronny,

Without seeing the artificats first hand is not possible to know what is
going on.  The best I can suggest is that you look at the near/far planes
of the scene, could it be that the near/far planes are clipping the text?

Also look at the possibility of state leaking into the text for some
reason. Do you have custom OpenGL code?

Finally, which OSG version are you using?  The latest OSG version will
likely have the most bug fixes so there is small chance that this might
address issues.

Robert.

On 17 April 2016 at 17:58, Ronny Hatteland  wrote:

> Hi,
>
> By coincidence I made some progress to an issue that has been bugging me
> for two years, where the osgText disappears in a certain case. I am using
> VBO hardware instancing for another object, and when only the text and the
> VBO hardware instanced objects are visible (using a Switch node), the text
> disappears.
>
> Previously, I though it was related to the bounding box of the VBO
> instances, as the text would appear again if other objects were shown at
> the same time. However, today I noticed that when the text was not updated
> on cursor move, the original text that was set on the creation of the
> osgText::Text object would be visible as expected.
>
> The text is updated using txtObject->SetText(text) with the cursor
> position on a grid on the xz plane, with a text looking like this "(%d,
> %d)". Below is the code for the initialization of the text objects:
>
>
> Code:
>
> txtSelectedCell = new osgText::Text;
> txtSelectedCell->setDataVariance(Object::DYNAMIC);
> txtSelectedCell->setFont(consolasBold);
> txtSelectedCell->setFontResolution(128, 128);
> txtSelectedCell->setCharacterSizeMode(osgText::TextBase::OBJECT_COORDS);
> txtSelectedCell->setLineSpacing(0.10f);
> txtSelectedCell->setPosition(osg::Vec3(0.0, /*-0.001*/0.0, 0.0));
> txtSelectedCell->setCharacterSize(0.0015f);
> txtSelectedCell->setColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
> txtSelectedCell->setBackdropType(osgText::Text::OUTLINE);
> txtSelectedCell->setBackdropColor(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f));
> txtSelectedCell->setBackdropOffset(0.10f, 0.10f);
> txtSelectedCell->setAxisAlignment(osgText::Text::XZ_PLANE);
> txtSelectedCell->setAlignment(osgText::Text::CENTER_CENTER);
> txtSelectedCell->setText("(X,Y)");
>
> ref_ptr infoCellText = new osg::Geode;
> infoCellText->setDataVariance(Object::DYNAMIC);
> infoCellText->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,
> osg::StateAttribute::OFF);
> infoCellText->getOrCreateStateSet()->setMode(GL_LIGHTING,
> osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
> infoCellText->getOrCreateStateSet()->setMode(GL_BLEND,
> osg::StateAttribute::OFF | osg::StateAttribute::OVERRIDE);
> infoCellText->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,
> osg::StateAttribute::OFF);
> text_program = LoadShaderProgram("textMaterial.vert",
> "textMaterial.frag");;
> infoCellText->getOrCreateStateSet()->setAttributeAndModes(text_program.get(),
> osg::StateAttribute::ON);
> osgUtil::GLObjectsVisitor
> glov(osgUtil::GLObjectsVisitor::TRAVERSE_ALL_CHILDREN |
> osgUtil::GLObjectsVisitor::SWITCH_OFF_DISPLAY_LISTS |
> osgUtil::GLObjectsVisitor::SWITCH_ON_VERTEX_BUFFER_OBJECTS);
> ref_ptr state = new osg::State(); glov.setState(state);
> infoCellText.get()->accept(glov);
> infoCellText->setCullingActive(false);
> infoCellText->addDrawable(txtSelectedCell.get());
> ref_ptr mtSelectedCell->addChild(infoCellText); //
> Updated on mouse move
>
>
>
>
> Exploring this further, I created a new text object each time position on
> the grid was updated, that I added to the infoCellText geode. This would
> work only if I did not remove the original txtSelectedCell child. However,
> it would not work if txtSelectedCell->SetText was initialized to "" instead
> of "(X,Y)". If the txtSelectedCell text was changed with setText at the
> same time as a new osgText was added to the infoCellText geode, the text
> would not show.
>
> I suspect this has something to do with the bounding box of the text,
> however, I am not entirely sure if it is related to the osgText::Text
> object or the Geode with the text as a child. I tried to call
> computeBound() on txtSelectedCell as well as infoCellText after updating
> the text with setText(), but without any luck. In many cases when the text
> is not displayed I get weird artifacts with planes cutting through the
> view. Any suggestions would be extremely appreciated.
>
> Thank you!
>
> Cheers,
> Ronny
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=66845#66845
>
>
>
>
>
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[osg-users] Disappearing text

[Ronny Hatteland]

Hi,

By coincidence I made some progress to an issue that has been bugging me for 
two years, where the osgText disappears in a certain case. I am using VBO 
hardware instancing for another object, and when only the text and the VBO 
hardware instanced objects are visible (using a Switch node), the text 
disappears.

Previously, I though it was related to the bounding box of the VBO instances, 
as the text would appear again if other objects were shown at the same time. 
However, today I noticed that when the text was not updated on cursor move, the 
original text that was set on the creation of the osgText::Text object would be 
visible as expected.

The text is updated using txtObject->SetText(text) with the cursor position on 
a grid on the xz plane, with a text looking like this "(%d, %d)". Below is the 
code for the initialization of the text objects:


Code:

txtSelectedCell = new osgText::Text;
txtSelectedCell->setDataVariance(Object::DYNAMIC);
txtSelectedCell->setFont(consolasBold);
txtSelectedCell->setFontResolution(128, 128);
txtSelectedCell->setCharacterSizeMode(osgText::TextBase::OBJECT_COORDS);
txtSelectedCell->setLineSpacing(0.10f);
txtSelectedCell->setPosition(osg::Vec3(0.0, /*-0.001*/0.0, 0.0));
txtSelectedCell->setCharacterSize(0.0015f);
txtSelectedCell->setColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
txtSelectedCell->setBackdropType(osgText::Text::OUTLINE);
txtSelectedCell->setBackdropColor(osg::Vec4(0.0f, 0.0f, 0.0f, 1.0f));
txtSelectedCell->setBackdropOffset(0.10f, 0.10f);
txtSelectedCell->setAxisAlignment(osgText::Text::XZ_PLANE);
txtSelectedCell->setAlignment(osgText::Text::CENTER_CENTER);
txtSelectedCell->setText("(X,Y)");

ref_ptr infoCellText = new osg::Geode;
infoCellText->setDataVariance(Object::DYNAMIC);
infoCellText->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, 
osg::StateAttribute::OFF);
infoCellText->getOrCreateStateSet()->setMode(GL_LIGHTING, 
osg::StateAttribute::OFF | osg::StateAttribute::PROTECTED);
infoCellText->getOrCreateStateSet()->setMode(GL_BLEND, osg::StateAttribute::OFF 
| osg::StateAttribute::OVERRIDE);
infoCellText->getOrCreateStateSet()->setMode(GL_DEPTH_TEST, 
osg::StateAttribute::OFF);
text_program = LoadShaderProgram("textMaterial.vert", "textMaterial.frag");;
infoCellText->getOrCreateStateSet()->setAttributeAndModes(text_program.get(), 
osg::StateAttribute::ON);
osgUtil::GLObjectsVisitor glov(osgUtil::GLObjectsVisitor::TRAVERSE_ALL_CHILDREN 
| osgUtil::GLObjectsVisitor::SWITCH_OFF_DISPLAY_LISTS | 
osgUtil::GLObjectsVisitor::SWITCH_ON_VERTEX_BUFFER_OBJECTS);
ref_ptr state = new osg::State(); glov.setState(state);
infoCellText.get()->accept(glov);
infoCellText->setCullingActive(false);
infoCellText->addDrawable(txtSelectedCell.get());
ref_ptr mtSelectedCell->addChild(infoCellText); // Updated on 
mouse move




Exploring this further, I created a new text object each time position on the 
grid was updated, that I added to the infoCellText geode. This would work only 
if I did not remove the original txtSelectedCell child. However, it would not 
work if txtSelectedCell->SetText was initialized to "" instead of "(X,Y)". If 
the txtSelectedCell text was changed with setText at the same time as a new 
osgText was added to the infoCellText geode, the text would not show.

I suspect this has something to do with the bounding box of the text, however, 
I am not entirely sure if it is related to the osgText::Text object or the 
Geode with the text as a child. I tried to call computeBound() on 
txtSelectedCell as well as infoCellText after updating the text with setText(), 
but without any luck. In many cases when the text is not displayed I get weird 
artifacts with planes cutting through the view. Any suggestions would be 
extremely appreciated.

Thank you!

Cheers,
Ronny

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[osg-users] Disappearing Text

[Andrew Kanter]

Hi,

with 


Code:

osg::ref_ptrosgText::Text label = new osgText::Text();
osg::ref_ptrosg::Geode labelGeode = new osg::Geode();
labelGeode-setName(TEXT_TOP);
labelGeode-addDrawable(label.get());
label-setCharacterSize(1.3);
label-setFont(arial.ttf);
label-setText(fileName);
label-setAxisAlignment(osgText::Text::XY_PLANE);
label-setDrawMode(osgText::Text::TEXT);
label-setAlignment(osgText::Text::CENTER_TOP);
label-setPosition( osg::Vec3(0.0f, 0.5f,6.05f) );
label-setColor(_textColorTop);
shapeGroup-addChild(labelGeode.get());




i write text on a geode. But when the geode is ovelayed with a transparent 
geode the text disappears.


Code:

osg::ref_ptrosg::Material shapeMaterial = new osg::Material;  
//rote Einfärbung

shapeMaterial-setDiffuse(osg::Material::FRONT_AND_BACK, osg::Vec4(1.0f, 0.0f, 
0.0f, 1.0f)); 

shapeMaterial-setTransparency(osg::Material::FRONT_AND_BACK, 0.8f);
osg::ref_ptrosg::StateSet stateSet = new 
osg::StateSet();
stateSet-setMode(GL_BLEND, 
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON );
stateSet-setAttribute(shapeMaterial.get(), 
osg::StateAttribute::OVERRIDE);

stateSet-setRenderingHint(osg::StateSet::TRANSPARENT_BIN);
shapeGeodeRZ-setStateSet(stateSet.get());




How can i stop the text from disappearing?

Thank you!

Cheers,
Andrew

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