[osg-users] Vertices Selection
Hi, I would like to know if it is possible to selects vertices of an osg::Geometry and to transform them (translation and rotation). I know that it is possible to select objects (osgpick example) but don-t know about vertices. Is there an example or documentation dealing with vertices selection . Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41558#41558 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] osgWidget documentation?
Hi community, I've bumped into using osgWidget for an application I'm developing. It seems very powerful and customizable, yet I can't find any documentation / tutorial on how to use it. Is there any documentation available for osgWidget? Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41560#41560 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Vertices Selection
Hi, In osgpick example for selection LineSegmentIntersectorhttp://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00388.htmlis used. To pick a point you need to use PolytopeIntersectorhttp://www.openscenegraph.org/documentation/OpenSceneGraphReferenceDocs/a00526.htmlso that you can pick point also. Regards Santosh G. On Fri, Jul 22, 2011 at 1:28 PM, Miguel Lokida mlok...@yahoo.fr wrote: Hi, I would like to know if it is possible to selects vertices of an osg::Geometry and to transform them (translation and rotation). I know that it is possible to select objects (osgpick example) but don-t know about vertices. Is there an example or documentation dealing with vertices selection . Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41558#41558 ___ 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] Vertices Selection
Hi, check in MovieEventHandler::handle in osgmovie example. There is an example of how you can get vertex indices for the part of the geometry that was picked. jp On 22/07/2011 09:58, Miguel Lokida wrote: Hi, I would like to know if it is possible to selects vertices of an osg::Geometry and to transform them (translation and rotation). I know that it is possible to select objects (osgpick example) but don-t know about vertices. Is there an example or documentation dealing with vertices selection . Thank you! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41558#41558 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- This message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osg-users Digest, Vol 49, Issue 32
On 7/21/2011 10:31 PM, caijun2002108 wrote: Hello,everyone! I've used the OSG in my project for one week.And I found it is powerful,and it's cool. My project is a 3D GIS system,I want to make the manipulator like google earth(GE).So I used the trackballmanipulator.But it has some difference with GE.When I look the source code of trackballmanipulator,I do not understand the meaning of trackball function! Can anyone tell me the meaning of the function? Waiting for your answers,thank you very much! I'd start by trying out osgEarth. It already has a lot of what you'll need, and your entire question may go away. Good luck! -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Retrieving value from a shader
Hello, I developped a texture projective mapping (TPM) using vertex and fragment shader and what I would like to do now is to get the information whether an object has been lit or not by the TPM. I was thinking of setting a uniform value to 0 in osg through the setUniform function and change it to 1 in the pixel shader if any of the pixel has been lit by the tpm shader. Setting the value to 0 is not complicate but I can't retrieve the value of the uniform modified by my shader. Is it possible ? Or is what I'm doing completely stupid ? Thanks for your help. Wallysx -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41572#41572 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
On 7/22/2011 9:32 AM, Fred Maulir wrote: I developped a texture projective mapping (TPM) using vertex and fragment shader and what I would like to do now is to get the information whether an object has been lit or not by the TPM. I was thinking of setting a uniform value to 0 in osg through the setUniform function and change it to 1 in the pixel shader if any of the pixel has been lit by the tpm shader. Setting the value to 0 is not complicate but I can't retrieve the value of the uniform modified by my shader. Is it possible ? Or is what I'm doing completely stupid ? You can't set a uniform. The most common method of extracting data from shaders is to write to a (possibly small) texture that is then read back and analyzed by the host code. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
Great advice. Do you mean than I can I retrieve the modified texture through a getUniform call after the update() call ? In fact I'll have about 200 objects that I need to know if each of them have been lit or not. Do you think I can do a 15*15 texture and associate one pixel with each object ? Thus how can I retrieve a custom value in pixel shader that we'll indicate me which is the index of the current object on which the shader is applied to ? Thanks again for your help. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41575#41575 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgWidget documentation?
On Fri, 2011-07-22 at 10:50 +0200, Daniel Cámpora wrote: Hi community, I've bumped into using osgWidget for an application I'm developing. It seems very powerful and customizable, yet I can't find any documentation / tutorial on how to use it. Is there any documentation available for osgWidget? Not yet. :( But feel free to use the lists to ask any question, or add me via googletalk (cubic...@gmail.com) and ask me directly... Thank you! Cheers, Daniel -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41560#41560 ___ 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
[osg-users] Depth texture for Pixel/Fragment Shader
Hello everybody, I'm new to osg and glsl but I wrote a shader for Texture Projection. So far everything is working as expected but I'd like now to implement the occlusion of different objects (depth order). Can any one help me with this. I couldn't managed to find a osg/glsl tutorial about that. Here is what I currently have: [Image: http://s1.postimage.org/12pl9jd0/im1.jpg ] (http://postimage.org/image/12pl9jd0/) Here is what I would like to obtain: [Image: http://s1.postimage.org/1243a0xw/im2.jpg ] (http://postimage.org/image/1243a0xw/) Thank you wallys -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41577#41577 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] 33 days till OpenScengraph BOF at SIGGRAPH 2011
Hi John, 37 days till OpenScengraph BOF at SIGGRAPH 2011. 10 AM Wed 10 Aug 2011. Anyone thinking of presenting at the BOF? Slots are 5 to 20 minutes. Sorry for not getting back to you sooner. Our presence at Siggraph was not certain until pretty recently, and I didn't want to prepare stuff that wouldn't be used. Do you still have some presentation slots available? I would probably like to keep it pretty short, maybe me talking for about 5 minutes and if people have questions afterwards, so maybe 10 minutes overall. I'd present our recent projects and what we're doing with OSG. Thanks in advance, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.dyndns-web.com/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] 33 days till OpenScengraph BOF at SIGGRAPH 2011
Hi John, Unfortunately I won't be attending this years BOF. Do you, or others, wish for me to prepare a presentation, or perhaps coordinate with another person to convey a few key points that might be of use to the attendees? Is there going to be any web access at the BOF? I'm just wondering if we might be able to stream video/audio in or out of the BOF room. Cheersm Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
On 7/22/2011 10:09 AM, Fred Maulir wrote: Great advice. Do you mean than I can I retrieve the modified texture through a getUniform call after the update() call ? Not through getUniform, but you can retrieve the modified texture after rendering completes. I'm trying to remember which example might show this. If you don't even care to see the onscreen data, look at the osgscreencapture example. It renders to a texture and then grabs that texture as an image and writes it to disk, In fact I'll have about 200 objects that I need to know if each of them have been lit or not. Do you think I can do a 15*15 texture and associate one pixel with each object ? Yes. Also, with the non-power-of-two texture extensions, you could make a 20x10 or even 200x1 texture just fine. Thus how can I retrieve a custom value in pixel shader that we'll indicate me which is the index of the current object on which the shader is applied to ? Stick a Uniform on each object called ObjectID and set it to a number in the range of [0,199]. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
Thanks for the ObjectID Uniform idea. It is working well. However, I still can't find a way to retrieve data from the shader. The texture seems a good idea but I don't know how to do it. Any idea ? As for the screencapture examples they are doing one pass to render the scene in the texture although I think it is really ressources consumming for what I wanna do. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41581#41581 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] 33 days till OpenScengraph BOF at SIGGRAPH 2011
Hi Robert, Unfortunately I won't be attending this years BOF. Do you, or others, wish for me to prepare a presentation, or perhaps coordinate with another person to convey a few key points that might be of use to the attendees? If you want I can volunteer to present this. I know in past years you prepared a quick presentation about new developments and what's upcoming in OSG. I think that would be very important for project visibility, as there are often quite a few walk-ins (people who don't use OSG but come in to see what it's like) to the BOF. Is there going to be any web access at the BOF? I'm just wondering if we might be able to stream video/audio in or out of the BOF room. In past years internet access at the conference was kind of sketchy, it could work fine for 5 minutes then go down to 1 byte per second, go back up and then drop out completely, etc. So I wouldn't rely on this. If you want to present video better to give it to the presenter beforehand. Also we might be able to capture some video we could post on the OSG site afterwards... J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.dyndns-web.com/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
On 7/22/2011 1:39 PM, Fred Maulir wrote: However, I still can't find a way to retrieve data from the shader. The texture seems a good idea but I don't know how to do it. Any idea ? As for the screencapture examples they are doing one pass to render the scene in the texture although I think it is really ressources consumming for what I wanna do. I'm not sure why you're saying their technique won't work for you. Rendering something into a texture is exactly what you want, right? -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
In fact it seems very painful as I have to render the scene twice: the first time render the scene in the texture file to retrieve the data, and the second time for the actual viewer. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41584#41584 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
On 7/22/2011 2:22 PM, Fred Maulir wrote: In fact it seems very painful as I have to render the scene twice: the first time render the scene in the texture file to retrieve the data, and the second time for the actual viewer. I see. I didn't realized you wanted to see AND analyze the scene simultaneously. Then what you probably want is multiple render targets. There's and example called osgmultiplerendertergets, but I've never dug into how it works. -- Chris 'Xenon' Hanson, omo sanza lettere. xe...@alphapixel.com http://www.alphapixel.com/ Digital Imaging. OpenGL. Scene Graphs. GIS. GPS. Training. Consulting. Contracting. There is no Truth. There is only Perception. To Perceive is to Exist. - Xen ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
Exact, that's what I would like to do. I have a scene I want to render and in the same time I have a value I want to get back from the shader. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41586#41586 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Retrieving value from a shader
I've been told that to solve my issue I should maybe use Frame Buffer Object (FBO). I don't know FBO at all but I wonder whether it could work or not. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41587#41587 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
