Re: [osg-users] osg-users Digest, Vol 42, Issue 19
Hi delta, Would it be possible to sign with your real name so everyone can address you correctly? :) What kind of task would you like to solve with TBB? OSG uses Openthreads for all multithreading issues. Thank you! Cheers, Torben -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34686#34686 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [Qt]GraphicWindowEmbedded
Hi, I have a problem concerning osg integration in Qt. I took the example of osgViewerQt as a base and implemented it in my project. When I execute frame function into my Qt lib there is no problem, I get my video into my widget. But if I call it from the graphic engine of my project ( compiled as a .dll and launched into a QThread ) it crashes when I execute the frame. I can set the viewer event handlers, call realize() function but it don't execute the frame properly. But if I set up a window with setUpViewInWindow() function into the game engine, I can execute the viewer frame from the game engine without any crash. I think it's a graphic context problem but I can't put the finger on what is the origin of this issue. Moreover, I found another curious problem maybe relative to the other problem I encounter. If, in the QtViewer, I don't set the threading model to SingleThread (like it is said into the osgViewerQt example), and I launch the frame from Qt, it crashes just like in my other problem (into the frame of ViewerBase, at bottom of the function, into the - renderingTraversals() function, at line (*itr)-runOperations()). I try using other threading model but in vain. Is someone understanding what happen and try to guide me to a solution ? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34667#34667 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Visual C++ CLR Windows Forms app using OpenSceneGraph
Hi, i work with osg for about 3 month now using it with win32 console apps and mfc. now i want to use an osg visualization window in a windows forms project as a small window in the main window. I am thinking of a panel or a picture box to define the rect for the visualization surface, but in the moment i have no idea how it will get to run. if anyone has any ideas or an example solution it would help me very much! Thank you! Cheers, Andreas -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34687#34687 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Question about camera autoComputeHomePosition
I have a question about above function. In my application on initialization I call: getCamera()-setViewport(new osg::Viewport(0, 0, width(), height())); getCamera()-setProjectionMatrixAsPerspective(20.0f, static_castdouble(width())/static_castdouble(height()), 0.001f, 1.0f); getCameraManipulator()-setAutoComputeHomePosition(true); This sequence makes my scene to be automatically scaled to fill the window. When changing the angle from 20.0 to some larger value the scene just apears smaller and vice versa. What I expected is the calculation of the camera/eye distance comes out different so the scene is filling the window again. Obviously there is a misunderstanding from my side. I came to the problem when trying to calculate and set a distance manually for having the bounding box center plane of the scene to appear in original size. The distance should be d = widthMM / (2.0 * tan (alfa/2.0)) widthMM = window width in mm alfa = viewing angle used in setProjectionMatrixAsPerspective converted to radians. This calculation really shows my scene always in the same size, unfortunately not the correct one. Again I don't understand things here. I think there is a general misunderstanding from my side. Thanks for any hints. - Werner - ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set camera focal length
Hi Igor,
But i still can't set up the position and rotation of the viewer's camera.
this-_viewer.getCamera()-setReferenceFrame(::osg::Transform::ABSOLUTE_RF);
this-_viewer.getCamera()-setViewMatrix(::osg::Matrix::translate(0.5, 0.3,
0.1));
this does nothing.
My guess is becase i also have to call:
::osg::ref_ptr ::osgGA::KeySwitchMatrixManipulator keyswitchManipulator =
new ::osgGA::KeySwitchMatrixManipulator;
keyswitchManipulator-addMatrixManipulator( '1', Trackball, new
::osgGA::TrackballManipulator() );
this-_viewer.setCameraManipulator( keyswitchManipulator.get() );
or the offscreen capture doesn't render the scene, just an empty
background. It looks like viewer needs a camera manipulator or it won't
render the scene.
Is it at all possible to move the camera programmatically after a camera
manipulator has been set for the viewer? Or can i avoid creating a camera
manipulator?
Well, it seems like the cameramanipulator is causing this. To define
manually a view matrix for the camera viewer, you need eigther not to use a
camera manipulator or to set the second parameter of
Viewer::setCameraManipulator (resetPosition) to false.
Be aware that in case you don't define a camera manipulator, calling
Viewer::run() will automatically add a TrackballManipulator. In this case,
just replace the Vewer::run() call by the rendering loop :
while(!viewer.done())
{
viewer.frame();
}
Another possible issue is the view matrix itself. If you don't see the
scene, it is generally due to a wrong view Matrix.
Mourad
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[osg-users] Problim finding font
Hi folks, I have a strange problem with loading. On my normal machine everything works find. Fonts are found where they are. (Linux 2.6.34.7-0.5-desktop openSUSE 11.3 (x86_64)) Hoever it does not work on the following machine Linux 2.6.26-1-686 Debian Lenny. The error is the following: Warning: Could not find plugin to read objects from file ./../share/OpenWalnut/fonts/LiberationMono-Bold.ttf. The fonts are exactly where the program tries to find them. Any idea why the fonts are found on one machine and not on the other? Thanks, Alex ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problim finding font
Are you sure, freetype is installed on the other machine? Am Freitag, 10. Dezember 2010, 12:54:28 schrieb Alex (software): Hi folks, I have a strange problem with loading. On my normal machine everything works find. Fonts are found where they are. (Linux 2.6.34.7-0.5-desktop openSUSE 11.3 (x86_64)) Hoever it does not work on the following machine Linux 2.6.26-1-686 Debian Lenny. The error is the following: Warning: Could not find plugin to read objects from file ./../share/OpenWalnut/fonts/LiberationMono-Bold.ttf. The fonts are exactly where the program tries to find them. Any idea why the fonts are found on one machine and not on the other? Thanks, Alex ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- TEXION Software Solutions TEXION GmbH - Rotter Bruch 26a - D 52068 Aachen - HRB 14999 Aachen Fon: +49 241 475757-0, Fax: +49 241 475757-29, web: http://www.texion.eu Geschäftsführer/Managing Director: Werner Modenbach ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problim finding font
Alex (software) writes: Hi folks, I have a strange problem with loading. On my normal machine everything works find. Fonts are found where they are. (Linux 2.6.34.7-0.5-desktop openSUSE 11.3 (x86_64)) Hoever it does not work on the following machine Linux 2.6.26-1-686 Debian Lenny. The error is the following: Warning: Could not find plugin to read objects from file ./../share/OpenWalnut/fonts/LiberationMono-Bold.ttf. The fonts are exactly where the program tries to find them. Any idea why the fonts are found on one machine and not on the other? You can find out inspecting the output of strace: strace -e trace=access your_program -- Alberto ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Advice on Shader usage and osgShadow
Hi! Hmmm... I haven't looked at ViewDependentShadow so far. I'm a little confused now. How are things workingh together? I have a ShadowScene and set the ShaderTechnique with my own class derived from SoftShadowMap. I wrote virtual methods for createShaders and createUniforms for support of my shaders. ShaderTechnique is having its shaders and now I see ViewDependentShadow is also having a different set of shaders. When is ViewDependentShadow coming into the game? Many :-( Can anyone give me some explanation please? Thanks in advance - Werner - Am Donnerstag, 9. Dezember 2010, 15:18:15 schrieb Jean-Sébastien Guay: Hello Werner, Actually I'd like to be more flexible in the use of the ShaderTechnic and I ask myself if it is possible to use the standard ShadowTechnics and attach my Shaders to my user scene child somehow. There is no problem with this, we do it ourselves. The only thing to be aware of is that anytime you have a shader on a child node somewhere in your graph, if you want it to have shadows then you need to use the same shadow mapping code as the ShadowTechnique's shaders. So it may be easier to do as the ViewDependentShadow classes do: separate the main shader and the shadow shader (for both stages, vertex and fragment), and just have some function in your code that when creating a new osg::Program, will add the user's shaders plus the shadow shaders. The user's shaders would just have to call the function(s) defined in the shadow shaders at the appropriate time. Otherwise you can of course copy-paste the shadow shader code into your own shaders instead, but that is error-prone and if you decide you want to change something (like filter the shadows, or whatever) you have to change it in many places. Hope this helps, J-S ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] TexGen for screen coordinates.
I've been trying to apply a 2d texture to an object where I want the UVs to correspond to screen position. A bit like using EYE_LINEAR texgen, but with the texture projected 'orthographically' through the screen. What I want would in effect be like applying the texture so it always spans the window, but without applying the perspective of the camera. I guess, a bit like using the texture as a stencil. I've tried using EYE_LINEAR, and that very nearly does what I want, but I want to remove the effect of perspective on the way the texcoords are calculated. In other words, I think I want calculated texture UV's to be something like: texcoord.x = (worldPosition * (projectionMatrix * modelViewMatrix)).x texcoord.y = (worldPosition * (projectionMatrix * modelViewMatrix)).y What's the best way to implement this without using stencil buffer or shaders? Is there a way to do it by adjusting the texture matrix object to remove the perspective projection? Or would it be better to recalculate texCoords on geometries prior to each frame? Hope this makes some kind of sense. Cheers, Chris Denham -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34694#34694 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rain/snow accumulation on the screen
Hi all, I am also looking into this issue like Nik. the needs are: 1.Rain drops must appear on the screen when in fps (car driving) camera mode 2.They dont need to move, but their numbers will increase in time and make it difficult to see the environment. 3.When activated a wiper will rotate on the screen, clearing the raindrops as it touches them. similarly snow will accumulate on the windshield and wiper will clean them too. Can this be done with osg particle classes? What kind of new functionality may be needed if particle system is not enough to handle these tasks ? Or what specific features of osg can accomplish such tasks? Thanks in advance for any hints. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34695#34695 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problim finding font
Hi Werner, it seems to be installed: I can find libfreetype6 in version 2.3.7. On the other machine it is 2.3.12. Maybe this is the problem I will have to check this. Cheers, Alex - original message Subject: Re: [osg-users] Problim finding font Sent: Fri, 10 Dec 2010 From: Werner Modenbachwerner.modenb...@texion.eu Are you sure, freetype is installed on the other machine? Am Freitag, 10. Dezember 2010, 12:54:28 schrieb Alex (software): Hi folks, I have a strange problem with loading. On my normal machine everything works find. Fonts are found where they are. (Linux 2.6.34.7-0.5-desktop openSUSE 11.3 (x86_64)) Hoever it does not work on the following machine Linux 2.6.26-1-686 Debian Lenny. The error is the following: Warning: Could not find plugin to read objects from file ./../share/OpenWalnut/fonts/LiberationMono-Bold.ttf. The fonts are exactly where the program tries to find them. Any idea why the fonts are found on one machine and not on the other? Thanks, Alex ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- TEXION Software Solutions TEXION GmbH - Rotter Bruch 26a - D 52068 Aachen - HRB 14999 Aachen Fon: +49 241 475757-0, Fax: +49 241 475757-29, web: http://www.texion.eu Geschäftsführer/Managing Director: Werner Modenbach ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org --- original message end ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Advice on Shader usage and osgShadow
Hi Werner, I'm a little confused now. How are things workingh together? I have a ShadowScene and set the ShaderTechnique with my own class derived from SoftShadowMap. I wrote virtual methods for createShaders and createUniforms for support of my shaders. ShaderTechnique is having its shaders and now I see ViewDependentShadow is also having a different set of shaders. When is ViewDependentShadow coming into the game? Yes, it seems you're confused indeed :-) Let's go back to basics and work from there. You use osgShadow by adding a ShadowedScene in your scene graph, and setting a ShadowTechnique on that ShadowedScene. SoftShadowMap is one possible shadow technique, and the ViewDependentShadow ones are others (StandardShadowMap, MinimalShadowMap*, LightSpacePerspectiveShadowMap, etc.). I was just using those shadow techniques as an example because you hadn't mentioned which one you were using, just that you had subclassed an existing one... But what I said still applies. The general idea is that you can attach shaders (actually an osg::Program containing shaders) at any node in your graph, and the osg::Program will be inherited downwards like any state. The ShadowTechnique activates its own shaders at the ShadowedScene level. So if no other nodes below the ShadowedScene have an osg::Program, the one from the ShadowTechnique will apply to the whole subgraph. But if a node below the ShadowedScene has its own osg::Program, it will override the one from above for its own subgraph (subject to the same rules of state inheritance as any other StateAttribute, for example use of PROTECTED and OVERRIDE...). But the important part is, if you want your nodes below the ShadowedScene to have their own shaders AND have shadows, they need to do the shadow lookup the same way as the shaders that your ShadowTechnique has. This will generally be in 2 parts, vertex and fragment shader: If your ShadowTechnique's Program has a vertex shader (some do, some don't), it will generally calculate texture coordinates for the shadow map's texture unit. You need to do this in your own vertex shader too. If your ShadowTechnique's Program has a fragment shader (most do), it will generally do a texture lookup in the shadow map's texture unit and decide whether to use only ambient or full lighting depending on the result of this lookup (whether the fragment is in shadow or not). Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Advice on Shader usage and osgShadow
Hi J-S, Thank you very much! This was an excellent overview. GREAT !!! Just one little last question: If I understand right whatever ShadowTechnique is used the result when reaching my scenes user root node (child of ShadowScene) there will be the shadow texture which I can use in always the same way. Since the shader code of StandardShadowMap seems to be very complete I could cut and paste it, do my extensions in there and add the program to the StateSet of my node. This should work in a flexible way with any Shadowtechnique used? - Werner - Am Freitag, 10. Dezember 2010, 14:50:37 schrieb Jean-Sébastien Guay: Hi Werner, I'm a little confused now. How are things workingh together? I have a ShadowScene and set the ShaderTechnique with my own class derived from SoftShadowMap. I wrote virtual methods for createShaders and createUniforms for support of my shaders. ShaderTechnique is having its shaders and now I see ViewDependentShadow is also having a different set of shaders. When is ViewDependentShadow coming into the game? Yes, it seems you're confused indeed :-) Let's go back to basics and work from there. You use osgShadow by adding a ShadowedScene in your scene graph, and setting a ShadowTechnique on that ShadowedScene. SoftShadowMap is one possible shadow technique, and the ViewDependentShadow ones are others (StandardShadowMap, MinimalShadowMap*, LightSpacePerspectiveShadowMap, etc.). I was just using those shadow techniques as an example because you hadn't mentioned which one you were using, just that you had subclassed an existing one... But what I said still applies. The general idea is that you can attach shaders (actually an osg::Program containing shaders) at any node in your graph, and the osg::Program will be inherited downwards like any state. The ShadowTechnique activates its own shaders at the ShadowedScene level. So if no other nodes below the ShadowedScene have an osg::Program, the one from the ShadowTechnique will apply to the whole subgraph. But if a node below the ShadowedScene has its own osg::Program, it will override the one from above for its own subgraph (subject to the same rules of state inheritance as any other StateAttribute, for example use of PROTECTED and OVERRIDE...). But the important part is, if you want your nodes below the ShadowedScene to have their own shaders AND have shadows, they need to do the shadow lookup the same way as the shaders that your ShadowTechnique has. This will generally be in 2 parts, vertex and fragment shader: If your ShadowTechnique's Program has a vertex shader (some do, some don't), it will generally calculate texture coordinates for the shadow map's texture unit. You need to do this in your own vertex shader too. If your ShadowTechnique's Program has a fragment shader (most do), it will generally do a texture lookup in the shadow map's texture unit and decide whether to use only ambient or full lighting depending on the result of this lookup (whether the fragment is in shadow or not). Hope this helps, J-S -- TEXION Software Solutions TEXION GmbH - Rotter Bruch 26a - D 52068 Aachen - HRB 14999 Aachen Fon: +49 241 475757-0, Fax: +49 241 475757-29, web: http://www.texion.eu Geschäftsführer/Managing Director: Werner Modenbach ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Problem with Multiple Cameras drawing in the same viewport.
Hello all, I am new to OSG and I am having trouble implementing something in my scenegraph. Because my graph is a little complicated I will give you a simpler version of it focusing on the main concept. I have a scene with a model. This model consists of 3 submeshes. For each submesh I do three passes. These passes are the exact same for all submeshes. Here is the desired rendering order: FirstMesh-pass1, FirstMesh-pass2, FirstMesh-pass3, SecondMesh-pass1, SecondMesh-pass2, ... etc Any other rendering order won't work. (this is how the algorithm works) Because the statesets and a lot of other nodes are the same I want to share them between my passes. Because of this, at the start of my graph I place 3 osg::Cameras with different culling masks. And then I set different node mask to each of my submeshes. So, each camera will draw a different submesh. What I get is a very strange effect. Looks like it is something wrong with the depth buffer. (keep in mind that depth test is enabled and depth writes are on). Looks like having multiple cameras drawing at the same viewport somehow does not work. Do I miss something? Most likely I just misuse the osg::Cameras or I don't really understand their concept. Looking the diagram and the code it is easy to figure out what exactly I want to do. Do you have any suggestion around this problem? Thanks a lot for your time. Cheers, George PS: In the source code Imagine that the osg::Group named 'secondaryRoot' is a black box containing my 3 passes/renderbins -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34699#34699 Attachments: http://forum.openscenegraph.org//files/main_146.cpp http://forum.openscenegraph.org//files/diagram_985.png ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Advice on Shader usage and osgShadow
Hi Werner, If I understand right whatever ShadowTechnique is used the result when reaching my scenes user root node (child of ShadowScene) there will be the shadow texture which I can use in always the same way. Since the shader code of StandardShadowMap seems to be very complete I could cut and paste it, do my extensions in there and add the program to the StateSet of my node. This should work in a flexible way with any Shadowtechnique used? Instead, if you've subclassed from SoftShadowMap, I'd start from that shader and work from there. You can experiment of course. But yes, what you say is true, since the ShadowTechnique binds the shadow map texture at the ShadowedScene level (same as the osg::Program containing the shadow mapping shader(s)), you can use that texture unit at any node below the ShadowedScene (as long as another node doesn't bind another texture in the shadow map's texture unit! - again the StateAttribute inheritance rules apply). Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set camera focal length
just found where the problem is:
Viewer.cpp, line 1023: inside viewer.updateTraversals
if (_cameraManipulator.valid())
{
setFusionDistance( getCameraManipulator()-getFusionDistanceMode(),
getCameraManipulator()-getFusionDistanceValue() );
_camera-setViewMatrix(_cameraManipulator-getInverseMatrix());
}
So, at each frame the camera's matrix is overwritten by a new matrix which is
taken from MatrixManipulator.
I still wonder why viewer doesn't render anything at all (black image) if no
MatrixManipulator is set.
--
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http://forum.openscenegraph.org/viewtopic.php?p=34702#34702
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[osg-users] texture coordinate specification
Hi forum, I was going through the example osggameoflife and pondered over the texture specification part to visulize the game. I used to know that the texture coordinate s,t,q all has to be between 0.0 and 1.0. At one part of the example the texture coordinate has been specified as foollows: tcoords-push_back(0,0,0); tcoords-push_back(width,0,0); tcoords-push_back(width,0,height); tcoords-push_back(0,0,height); The width and height returns values more than 1 , like 128 X 128 Would be nice to have some explanation. Thank you! Cheers, Sajjadul -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34703#34703 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set camera focal length
Hello Igor, So, at each frame the camera's matrix is overwritten by a new matrix which is taken from MatrixManipulator. In the past few hours two people on this list told you that if you wanted to use your own view matrix you needed to set no camera manipulator... (Paul Martz and Mourad Boufarguine) Was that not clear enough? Go back to read their posts please. They're telling you exactly what you just found... I still wonder why viewer doesn't render anything at all (black image) if no MatrixManipulator is set. Most likely your view matrix calculation has an error. If you really think something is wrong, make a small example that demonstrates this with the least possible code and we can have a look, but otherwise these are things that are used by hundreds of people and projects around the world so it's unlikely there's a bug concerning this. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] texture coordinate specification
Hi Sajjdul, I used to know that the texture coordinate s,t,q all has to be between 0.0 and 1.0. No, it does not have to be between 0.0 and 1.0. It can be any value. For Texture1D/2D/3D, what happens outside the 0.0 to 1.0 range is specified by the wrap mode (texture-setWrap(...)). You can set it to REPEAT, CLAMP, CLAMP_TO_BORDER, CLAMP_TO_EDGE or MIRROR. See the OpenGL spec for what each wrap mode does. For TextureRectangle, the rules are different. The texture coordinates are defined in image units, so if you want a 128x128 texture to be fully visible on a quad, you need the texture coordinates to span the 0.0 to 128.0 range in both directions. Outside the image size range, the wrapping mode applies like for TextureXD. I expect the osggameoflife example uses TextureRectangle with 128x128 textures... Check an OpenGL book for more details, this is not really specific to OSG but is true for any OpenGL-based app. Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] change model dynamically
Hi, I want to change the 3D model dynamically at the runtime. I have inatialize my node at : _model = new osg::Node(); _model = osgDB::readNodeFile(model1.osg); and when I do a particular action, I would like that the 3D model changes, I write this : _model = osgDB::readNodeFile(model2.osg); But it doesn't work! Would you have an idea? Thank you! Cheers, lucie -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34707#34707 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] change model dynamically
Hi Lucie, I think this is a simple C++ issue. First you create _model which is a pointer on a node. Then you make a new node and set _model to store its adress. Next, you load a new node and set _model to store it again. So the first thing is, you don't need to do _model = new osg::Node(); So now _model is a pointer to a memory area where model1.osg is loaded. Let's assume that you make something like view-setSceneData(_model). Now, the view root node, which is also a pointeur, contain the same adress than _model, where model1.osg is loaded. Last, when you load a new model and set _model to store this new adress, you are not modifying the viewer root node. You should do a viewer-setSceneData(osgDB::readNodeFile(model2.osg)); or maybe a group-replaceChild(_model,osgDB::readNodeFile(model2.osg)); Don't hesitate to take a piece of paper to draw some memory allocation and pointers to understand what is really done. I hope this will help you. Regards, Vincent. 2010/12/10 lucie lemonnier lucielemonn...@hotmail.fr Hi, I want to change the 3D model dynamically at the runtime. I have inatialize my node at : _model = new osg::Node(); _model = osgDB::readNodeFile(model1.osg); and when I do a particular action, I would like that the 3D model changes, I write this : _model = osgDB::readNodeFile(model2.osg); But it doesn't work! Would you have an idea? Thank you! Cheers, lucie -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34707#34707 ___ 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] How to set camera focal length
Skylark wrote: Most likely your view matrix calculation has an error. Yes, just found out the view matrix was wrong and the image was black because the camera was inside some object or something, and i first thought i am reading from a wrong buffer. Sorry guys for bothering you with such simple stuff. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34710#34710 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Geometry and setUseDisplayList(false)
Am 10.12.10 16:32, schrieb Gabriel Nützi: Hi everybody I have a quite strange problem, I am a newbie, and probably it is a simple setting, which I do not know: I have subclassed from osg:Geometry and have set up in this class my Mesh which I want to render... the thing works fine, except, that when I use setUseDisplayList(false), (because I update my vertices every rendering loop in this viewer loop) , my mesh is rendered, but it seems that there is a somehow ,depending on the camera position, a bounding volume and the mesh gets sometimes not rendered looks like it is culled somehow... if you update your geometry, you must update its boundingbox. just call dirtyBound() on your geometry, implement computeBound() in your subclass or provide a maximum boundingbox with setInitialBound() when creating your object. HTH, Stephan ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] How to set camera focal length
Hi Igor, Yes, just found out the view matrix was wrong and the image was black because the camera was inside some object or something, and i first thought i am reading from a wrong buffer. Glad to know you found the problem. Sorry guys for bothering you with such simple stuff. It's not bothering with simple stuff that's the problem, we're here to help, but you have to read the replies in full to be able to profit from what we're saying. I really got the impression that you had ignored Paul's and Mourad's answers and gone to search for the answer yourself... Don't hesitate to ask questions, we're always glad to help. J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Making sure that reflection texture only draws if mirror is visible.
Greetings, I have some mirrors in my scene, which use RTT for reflections. I'd like to make sure that, if the mirror isn't visible, the RTT pass doesn't happen. A simple frustum check should be fine. If the mirror is in the scene camera's frustum, it would be okay to render the reflection texture even if the mirror itself is occluded. So what I have right now is a MatrixTransform node that is the parent of the whole mirror object sub-tree. I give this MatrixTransform a call callback, which renders the reflection texture before traversing to draw the mirror itself. What I'd like to do is add a frustum test here, so I can avoid doing the reflection RTT if the child sub-tree isn't even viewable by the camera. Is this possible? Thanks, Frank -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34713#34713 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Making sure that reflection texture only draws if mirror is visible.
Hi Frank, What I'd like to do is add a frustum test here, so I can avoid doing the reflection RTT if the child sub-tree isn't even viewable by the camera. Is this possible? In your cull callback you can cast the osg::NodeVisitor to a osgUtil::CullVisitor, and I think you can then call isCulled(node) to see if the node your callback is on would be culled or not (given the current settings of the CullVisitor, so whether culling is enabled, uses drawables or primitives, small feature culling etc.). Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Making sure that reflection texture only draws if mirror is visible.
Oh, nice, thanks! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34715#34715 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Question about camera autoComputeHomePosition
I think you misunderstand how the projection matrix works setProjectionMatrixAsPerspective is defined with the parameters (vFov, aspect, near, far) vFov sets the vertical field of view of the perspective meaning you will have a wider viewing angle the larger the value gets. aspectRatio is used to determine the horizontal FOV near defines the near clipping plane far defines the far clipping plane Increasing the vFOV will make items in the scene appear shorter away but their distance from the camera will remain unchanged. Cheers, Steven -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34719#34719 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rain/snow accumulation on the screen
I'm going to preface my comment by saying I've never done an effect like this before. I am, however, interested in how this could be accomplished. Adding in the wiper effect adds a particularly difficult layer of complexity to an effect like this. I would still suggest using a shader to do this effect. You would have to update the wiper's position as a uniform value per frame. You can then choose to apply the raindrop texture to pixels on one side of the wiper and then dont apply the texture to pixels on the other side of the wiper. You can also do this if your procedurally creating the raindrops on the fly. Cheers, Steven -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34720#34720 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] TexGen for screen coordinates.
On 12/10/2010 5:21 AM, Chris Denham wrote: I've been trying to apply a 2d texture to an object where I want the UVs to correspond to screen position. A bit like using EYE_LINEAR texgen, but with the texture projected 'orthographically' through the screen. What I want would in effect be like applying the texture so it always spans the window, but without applying the perspective of the camera. I guess, a bit like using the texture as a stencil. I've tried using EYE_LINEAR, and that very nearly does what I want, but I want to remove the effect of perspective on the way the texcoords are calculated. In other words, I think I want calculated texture UV's to be something like: texcoord.x = (worldPosition * (projectionMatrix * modelViewMatrix)).x texcoord.y = (worldPosition * (projectionMatrix * modelViewMatrix)).y What's the best way to implement this without using stencil buffer or shaders? Is there a way to do it by adjusting the texture matrix object to remove the perspective projection? Or would it be better to recalculate texCoords on geometries prior to each frame? Hope this makes some kind of sense. With those restrictions, it seems like the texture matrix is your only path to a solution, though I couldn't type it here off the top of my head. It would take some dev time to get it right. What you want to do would be trivial with a shader. Is there a reason why you've ruled out use of shaders for this problem? -- -Paul Martz Skew Matrix Software http://www.skew-matrix.com/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] TexGen for screen coordinates.
Paul Martz wrote: On 12/10/2010 5:21 AM, Chris Denham wrote: I've been trying to apply a 2d texture to an object where I want the UVs to correspond to screen position. A bit like using EYE_LINEAR texgen, but with the texture projected 'orthographically' through the screen. What I want would in effect be like applying the texture so it always spans the window, but without applying the perspective of the camera. I guess, a bit like using the texture as a stencil. I've tried using EYE_LINEAR, and that very nearly does what I want, but I want to remove the effect of perspective on the way the texcoords are calculated. In other words, I think I want calculated texture UV's to be something like: texcoord.x = (worldPosition * (projectionMatrix * modelViewMatrix)).x texcoord.y = (worldPosition * (projectionMatrix * modelViewMatrix)).y What's the best way to implement this without using stencil buffer or shaders? Is there a way to do it by adjusting the texture matrix object to remove the perspective projection? Or would it be better to recalculate texCoords on geometries prior to each frame? Hope this makes some kind of sense. With those restrictions, it seems like the texture matrix is your only path to a solution, though I couldn't type it here off the top of my head. It would take some dev time to get it right. What you want to do would be trivial with a shader. Is there a reason why you've ruled out use of shaders for this problem? -- -Paul Martz Skew Matrix Software http://www.skew-matrix.com/ Thanks Paul, I may use a shader if it comes down to it, but I was trying (if possible) to get a solution that works on Joe Public's bargin basement laptop that probably has poor (if any) shader support. I have experimented with texmat object to get the projection right, but I can't seem to get the matrix right (probably cos of my flakey maths). Maybe I'll post a cut down example an someone can see if they spot the problem. I've had some success with recalculating the texcoords on geometries and assigning them with UVs based on screen coords. It's very nearly what I want but I'm getting some odd distortions due to uv interpolation (I think). Possibly a result of the texture mapping perspective correction, though I tried switching that off with GL_PERSPECTIVE_CORRECTION_HINT = GL_FASTEST to no avail :( Ho hum maybe as you say, a shader is the answer, well, if I can make it fail tidy on old craptops. Cheers Chris. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=34722#34722 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
