[osg-users] Changing minFilter/magFilter of texture in osgVolume::RayTracedTechnique
I have RayTracedTechnique putting graphics on the screen, but things aren't rendering correctly. The culprit is the 'osg::Texture3D::LINEAR' choice that is used by default as the min/mag filter for the Texture3D object created by RayTracedTechnique. I'd like to change to NEAREST as I'm working with segmented/ labeled volume. The problem I'm seeing is that when I use the setMinFilter and setMaxFilter methods on the associated ImageLayer, things aren't getting updated for some reason. I know that's what's going on because if I actually edit the code in RayTracedTechnique.cpp to use NEAREST for the min/max filter on the Texture3D, I get the texture I want on the screen. Here is some code for context: osg::ref_ptr volume = new osgVolume::Volume; osg::ref_ptr tile = new osgVolume::VolumeTile; volume->addChild(tile.get()); osg::ref_ptr image_3d = createTexture3D(data,xfer_table); osg::ref_ptr layer = new osgVolume::ImageLayer(image_3d.get()); tile->setLayer(layer.get()); layer->addProperty(new osgVolume::AlphaFuncProperty(0.02f)); osg::ref_ptr technique = new osgVolume:: RayTracedTechnique (); technique->setNumSlices(200); tile->setVolumeTechnique(technique); layer->setMagFilter(osg::Texture3D:: NEAREST); layer->setMinFilter(osg::Texture3D:: NEAREST); Here is how the output looks when I edit RayTracedTechnique.cpp to use NEAREST minFilter/magFilter. This is how I expect it to look [cid:image001.png@01D4F464.82427F50] Default RayTracedTechnique.cpp (which uses LINEAR minFilter/magFilter): (Not expected) [cid:image003.png@01D4F466.84604450] How can I force the Texture3D object created by RayTracedTechnique to use NEAREST for minFilter/magFiltering? I'm using OSG 3.0. I know I need to upgrade, but I didn't see any way to do this even in OSG 3.6 Thanks, -Sailesh ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Image capture in memory
https://github.com/openscenegraph/OpenSceneGraph/blob/master/examples/osgposter/osgposter.cpp On Tue, Apr 16, 2019 at 12:22 PM Catalin Flower wrote: > Hi, > > What is the canonical way to capture an image of a view to memory with > different resolutions? > > Thank you! > > -- > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=75830#75830 > > > > > > ___ > osg-users mailing list > osg-users@lists.openscenegraph.org > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org > ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Removing objects with shared GL state from scene graph
Hi,
The following basically simulates the use case that's causing problems.
Code:
#include
#include
#include
#include
#include
#include
#include
/** A representation of something that gets edited.
* Pretend it's actually more complicated than this so that reference counting
the number of attached text nodes is a nuisance. */
class World
{
public:
World() : mScene(new osg::Group)
{
// add things so the viewer doesn't automatically zoom too far in to
see the 'objects'
auto worldCorners = { osg::Vec3(-11, -11, -11), osg::Vec3(-11, -11, 11),
osg::Vec3(-11, 11, -11), osg::Vec3(-11, 11, 11),
osg::Vec3(11, -11, -11), osg::Vec3(11, -11, 11),
osg::Vec3(11, 11, -11), osg::Vec3(11, 11, 11) };
for (auto corner : worldCorners)
{
osg::ref_ptr pat = new
osg::PositionAttitudeTransform();
pat->setPosition(corner);
pat->addChild(new osg::ShapeDrawable(new osg::Sphere(osg::Vec3(0,
0, 0), 0.1)));
mScene->addChild(pat);
}
}
osg::ref_ptr getScene() { return mScene; }
/** Adds an object with a label to the scene based on something the user
has done. */
void addObject(std::string name)
{
osg::ref_ptr object = new
osg::PositionAttitudeTransform();
object->setName(name);
static std::random_device r;
static std::default_random_engine randEngine(r());
static std::uniform_real_distribution<> dist(-10, 10);
object->setPosition(osg::Vec3(dist(randEngine), dist(randEngine),
dist(randEngine)));
osg::ref_ptr objectLabel = new osgText::Text();
osg::ref_ptr autoTransform = new
osg::AutoTransform();
autoTransform->addChild(objectLabel);
autoTransform->setAutoRotateMode(osg::AutoTransform::ROTATE_TO_SCREEN);
object->addChild(autoTransform);
autoTransform->getOrCreateStateSet()->setMode(GL_DEPTH_TEST,
osg::StateAttribute::OFF);
objectLabel->setText(name);
objectLabel->setCharacterSize(1);
osg::ref_ptr shape = new osg::Sphere(osg::Vec3(0, 0, 0), 1);
object->addChild(new osg::ShapeDrawable(shape));
mScene->addChild(object);
}
/** Removes an object from the scene based on something the user has done.
*/
void removeObject(std::string name)
{
osg::ref_ptr child;
for (unsigned int i = 0; i < mScene->getNumChildren(); ++i)
{
if (mScene->getChild(i)->getName() == name)
{
child = mScene->getChild(i);
mScene->removeChild(i);
break;
}
}
// If we call child->releaseGLObjects() here, the text program will be
released, too, even though it could still be being used by other labels.
// If we don't, we may be detaching the last text node from the scene
graph, and so the text program may never get released.
}
private:
osg::ref_ptr mScene;
};
World world;
bool useNewViewer = true;
class EventHandler : public osgGA::GUIEventHandler
{
public:
bool handle(const osgGA::GUIEventAdapter& ea, osgGA::GUIActionAdapter& aa)
{
if (ea.getEventType() != osgGA::GUIEventAdapter::KEYDOWN)
return false;
// The user may wish to close the 3D view to work on something else and
then reopen it later.
// That would be a pain to implement directly, so instead, we simulate
it by reopening the 3D view when it's closed if Return was pressed while it was
open.
if (ea.getKey() == osgGA::GUIEventAdapter::KEY_Return)
{
useNewViewer = true;
return true;
}
// Press a letter key without shift to add an object.
else if (ea.getKey() >= 'a' && ea.getKey() <= 'z')
{
std::string name(1, ea.getKey());
world.addObject(name);
return true;
}
// Press a letter key with shift to remove an object.
else if (ea.getKey() >= 'A' && ea.getKey() <= 'Z')
{
std::string name(1, ea.getKey() - ('Z' - 'z'));
world.removeObject(name);
return true;
}
return false;
}
};
int main()
{
osg::ref_ptr currentViewer;
int returnCode = 0;
while (useNewViewer)
{
currentViewer = new osgViewer::Viewer;
currentViewer->setSceneData(world.getScene());
currentViewer->addEventHandler(new EventHandler);
useNewViewer = false;
returnCode = currentViewer->run();
}
return returnCode;
}
Imagine this is part of a world editor for a game or CAD software or one of any
number of types of software packages where you edit something and might want a
3D view of it, but wouldn't necessarily always want that 3D view taking up
space in the window, so you'd possibly close it and then reopen it
Re: [osg-users] Volume Rendering and Depth Buffer
Yeah, I wouldn't totally expect it would, but you can probably do that
intersection test yourself if needed. I think it'll be faster and more
accurate than the Z-buffer.
I did a tool that relied on the Z-buffer once. It was a bad choice...
On Tue, Apr 16, 2019 at 1:05 PM Anna Osvin wrote:
> If you mean osgViewer::View::computeIntersections, then we tried it. For
> some reason it does not check intersections with volume model.
>
> Here is raycast intersection check code:
>
> Code:
>
> bool pickPolygonalSceneIntersection( osgViewer::View& view, const
> osg::Vec2& point2d, osg::Vec3& pickedPoint )
> {
> const osg::Camera* camera = view.getCamera();
> if ( camera == nullptr ) {
> Q_ASSERT_X( false, "bool pickPolygonalSceneIntersection( ... )",
> "View has no camera." );
> return false;
> }
>
> osgUtil::LineSegmentIntersector::Intersections intersections;
>
> if ( view.computeIntersections( camera,
> osgUtil::Intersector::CoordinateFrame::WINDOW, point2d.x(), point2d.y(),
> intersections ) )
> {
> for (osgUtil::LineSegmentIntersector::Intersections::iterator hitr
> = intersections.begin();
> hitr != intersections.end();
> ++hitr)
> {
> if (hitr->nodePath.size() > 4)
> {
> pickedPoint = hitr->getWorldIntersectPoint();
>
> return true;
> }
> }
> }
>
> return false;
> }
>
>
>
>
>
> Chris Hanson wrote:
> > Instead of reading Z depth values, can you simply run an intersection of
> the click ray-vector against the model data (polygonal and volumetric) when
> they click to place markdown points?
> >
> > On Mon, Apr 15, 2019 at 2:34 PM Anna Osvin < ()> wrote:
> >
> >
> > > We are working on medical software for Dentists. We need to render
> CBCT and give user possibility to place some markdown points on it, for
> future diagnostics. Also sometimes it's required to render polygonal jaw
> models alongside with CBCT. As I said earlier, we nailed down the rendering
> and even "hit detection", but there is a nasty bag with Z Buffer values of
> the background being incorrect, therefore user can place points onto
> nothing.
> > >
> > > ...
> > >
> > > Thank you!
> > >
> > > Cheers,
> > > Anna
> > >
> > > --
> > > Read this topic online here:
> > > http://forum.openscenegraph.org/viewtopic.php?p=75839#75839 (
> http://forum.openscenegraph.org/viewtopic.php?p=75839#75839)
> > >
> > >
> > >
> > >
> > >
> > > ___
> > > osg-users mailing list
> > > ()
> > >
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> )
> > >
> >
> >
> >
> > --
> > Chris 'Xenon' Hanson, omo sanza lettere. http://www.alphapixel.com/ (
> http://www.alphapixel.com/)
> > Training • Consulting • Contracting
> > 3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL
> 4 • GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL
> > Legal/IP • Forensics • Imaging • UAVs • GIS • GPS •
> osgEarth • Terrain • Telemetry • Cryptography • LIDAR • Embedded • Mobile •
> iPhone/iPad/iOS • Android
> > @alphapixel (https://twitter.com/alphapixel) facebook.com/alphapixel (
> http://facebook.com/alphapixel) (775) 623-PIXL [7495]
> >
> > --
> > Post generated by Mail2Forum
> [/code]
>
> --
> Read this topic online here:
> http://forum.openscenegraph.org/viewtopic.php?p=75845#75845
>
>
>
>
>
> ___
> osg-users mailing list
> osg-users@lists.openscenegraph.org
> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
>
--
Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com
http://www.alphapixel.com/
Training • Consulting • Contracting
3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 •
GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL
Legal/IP • Forensics • Imaging • UAVs • GIS • GPS •
osgEarth • Terrain • Telemetry • Cryptography • LIDAR • Embedded • Mobile •
iPhone/iPad/iOS • Android
@alphapixel facebook.com/alphapixel (775)
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Re: [osg-users] Image capture in memory
"Catalin Flower" writes: > Hi, > > What is the canonical way to capture an image of a view to memory with > different resolutions? Hi, I think that examples/osgposter/osgposter.cpp might be what you are looking for. -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Missing features with GL Core profile
Hi, I use OpenSceneGraph and I want to use some features of OpenGL 3.3 and the Core profile. I compiled OpenSceneGraph with the option -DOPENGL_PROFILE=GL3. I got the features I wanted, however, some features of OSG do not work anymore, as lighting with osg::Light, osg::LineWidth, osg::LineStipple on so on. I know OSG is mainly built uppon GL2 features, and that Fixed Function Pipeline is not available in core profile, but I expected for "basic" features as light or lines to work. It the support of those features in Core profile is planned? Or do I have to implement shaders myself? Or are there any existing implementation? Thank you for your time, Hugo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75846#75846 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Image capture in memory
Hi, What is the canonical way to capture an image of a view to memory with different resolutions? Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=75830#75830 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Volume Rendering and Depth Buffer
If you mean osgViewer::View::computeIntersections, then we tried it. For some
reason it does not check intersections with volume model.
Here is raycast intersection check code:
Code:
bool pickPolygonalSceneIntersection( osgViewer::View& view, const osg::Vec2&
point2d, osg::Vec3& pickedPoint )
{
const osg::Camera* camera = view.getCamera();
if ( camera == nullptr ) {
Q_ASSERT_X( false, "bool pickPolygonalSceneIntersection( ... )", "View
has no camera." );
return false;
}
osgUtil::LineSegmentIntersector::Intersections intersections;
if ( view.computeIntersections( camera,
osgUtil::Intersector::CoordinateFrame::WINDOW, point2d.x(), point2d.y(),
intersections ) )
{
for (osgUtil::LineSegmentIntersector::Intersections::iterator hitr =
intersections.begin();
hitr != intersections.end();
++hitr)
{
if (hitr->nodePath.size() > 4)
{
pickedPoint = hitr->getWorldIntersectPoint();
return true;
}
}
}
return false;
}
Chris Hanson wrote:
> Instead of reading Z depth values, can you simply run an intersection of the
> click ray-vector against the model data (polygonal and volumetric) when they
> click to place markdown points?
>
> On Mon, Apr 15, 2019 at 2:34 PM Anna Osvin < ()> wrote:
>
>
> > We are working on medical software for Dentists. We need to render CBCT and
> > give user possibility to place some markdown points on it, for future
> > diagnostics. Also sometimes it's required to render polygonal jaw models
> > alongside with CBCT. As I said earlier, we nailed down the rendering and
> > even "hit detection", but there is a nasty bag with Z Buffer values of the
> > background being incorrect, therefore user can place points onto nothing.
> >
> > ...
> >
> > Thank you!
> >
> > Cheers,
> > Anna
> >
> > --
> > Read this topic online here:
> > http://forum.openscenegraph.org/viewtopic.php?p=75839#75839
> > (http://forum.openscenegraph.org/viewtopic.php?p=75839#75839)
> >
> >
> >
> >
> >
> > ___
> > osg-users mailing list
> > ()
> > http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
> > (http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org)
> >
>
>
>
> --
> Chris 'Xenon' Hanson, omo sanza lettere. http://www.alphapixel.com/
> (http://www.alphapixel.com/)
> Training • Consulting • Contracting
> 3D • Scene Graphs (Open Scene Graph/OSG) • OpenGL 2 • OpenGL 3 • OpenGL 4 •
> GLSL • OpenGL ES 1 • OpenGL ES 2 • OpenCL
> Legal/IP • Forensics • Imaging • UAVs • GIS • GPS • osgEarth • Terrain •
> Telemetry • Cryptography • LIDAR • Embedded • Mobile • iPhone/iPad/iOS •
> Android
> @alphapixel (https://twitter.com/alphapixel) facebook.com/alphapixel
> (http://facebook.com/alphapixel) (775) 623-PIXL [7495]
>
> --
> Post generated by Mail2Forum
[/code]
--
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http://forum.openscenegraph.org/viewtopic.php?p=75845#75845
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