Re: [osg-users] osg-users Digest, Vol 55, Issue 12
Hi Terry,
On 9 January 2012 18:35, Terry Welsh wrote:
> Ideally, I would like to have total control over the paths to search
> just using environment variables, but I don't see a way to do this.
> Are there any ways to control the plugin search paths other than with
> setLibraryFilePathList() and OSG_LIBRARY_PATH? Would it be alright to
> modify or amend the way OSG searches plugin paths? Maybe we can come
> up with something more flexible.
Something like the FindFileCallback found in include/osgDB/Callbacks?
You can assign a FindFileCallback to osgDB::Options or the Registry.
class OSGDB_EXPORT FindFileCallback : public virtual osg::Referenced
{
public:
virtual std::string findDataFile(const std::string& filename,
const Options* options, CaseSensitivity caseSensitivity);
virtual std::string findLibraryFile(const std::string&
filename, const Options* options, CaseSensitivity caseSensitivity);
protected:
virtual ~FindFileCallback() {}
};
I don't recall using it in conjunction with loading libraries but as
there is the findLibraryFile method I guess I must have thought about
it! Below is my svn entry from 2009 for include/osgDB/Options.
-- svn entry for include/osgDB/Options:
r10171 | robert | 2009-05-09 09:49:27 +0100 (Sat, 09 May 2009) | 8 lines
Refactored the Registry::ReadFileCallback, WriteFileCallback and
ReaderWriter::Options to they are now defined in their own header and
in the osgDB namespace.
Introduced a new FindFileCallback to Registry to compliement the
existing ReadFileCallback and WriteFileCallback.
Added support for assign Find, Read and WriteFileCallbacks to
osdDB::Options to enable plugins/applications to override the
callbacks just for that
read/write call and any nested file operations
--
Hope this helps,
Robert.
___
osg-users mailing list
osg-users@lists.openscenegraph.org
http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG website unresponsive
Hi All, On the version control front I've sought feedback on the various contenders and git looks to be the one of the best combinations for our needs. I don't think we need to go on debating the topic further as we've debated it plenty of the years. I'm curious, are their scripts available for subversion for keeping a svn repository in sync with a git one, in the same way that the current osg github repository is kept in sync with the osg one. I'm in two minds about whether we should attempt such a mirror, but if it's possible and desired by the community then it's something we consider as trying to support during the transition. In terms of commits I we'll just need to have a drop dead date for the existing subversion repository beyond which all commits then happen to the git repository. I would suggest that I complete the merges of the current pending submissions to the existing svn repository make a dev release then transfer across. I'll get myself a github account and start learning about it. However, I'm still deep in doing office admin work that I've been putting aside for many months so I need to clear this backlog first. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Draw line in 3D screen
Hi Lalit, In the past I've tackled problems like drawing from mouse coords into 3D by creating a ray from the mouse coords and then intersecting this with a plane. The maths for computing the intersection point can be handled by the osg::Plane class, there is no need to use the high level scene graph intersection routines. For you application only you will be able to answer how you want to constrain the points you want to generate - would a plane that is orthogonal to the image plane and going through the mid point of the data cloud be appropriate? You'll need to decide yourself what is appropriate. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] What callback for setting the viewMatrix of the camera every frame?
Hi robert, I know that this is possible in general. The Problem is that all the views and viewers are managed by a main application. I do not have access to this while-loop of the viewer. Besides I need the Manipulator. I just have to manipulate the viewMatrix sometimes. Anyway, thanks for your attendance. I may have found the solution. I just can't test it right now. Instead of setting a cameraCallback with: Code: ...->getViewerCamera()->setInitilDrawCallback(new MyInitialDrawCallback()); I should have used: Code: ...->getViewerCamera()->setPreDrawCallback(new MyPreDrawCallback()); It sounds way better. I didn't know that this callback exists. I hope this helps somebody.[/code] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44732#44732 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Scene graph structure vs. performance question
On 01/10/2012 02:06 AM, Joel Graff wrote: The application isn't designed to create particularly large scene graphs, but it is a shader development tool. I can't really guess at the effect of a bloated structure, but I have the funny feeling it won't really matter. I also don't really know how flexible I may want my application node to be, but I see significant advantages to using the latter method and letting profiling after the fact bear out the bottlenecks. I think you're right. For your use case, I don't think a few nodes that are technically redundant will matter all that much. You can always streamline later if it becomes a problem, but I doubt you'll need to. --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] What callback for setting the viewMatrix of the camera every frame?
HI Sebas, On 10 January 2012 15:38, Sebas Walther wrote: > Hi robert, > > I know that this is possible in general. The Problem is that all the views > and viewers are managed by a main application. I do not have access to this > while-loop of the viewer. Besides I need the Manipulator. I just have to > manipulate the viewMatrix sometimes. Anyway, thanks for your attendance. Why not use a custom camera manipulator? Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] What callback for setting the viewMatrix of the camera every frame?
Hi Robert, > Why not use a custom camera manipulator? The main application manages the camera manipulators itself. My program is only a plugin for this application. What if another programer wants to build a new camera manipulator for the main application? It will be difficult and annoying to write a custom manipulator for every manipulator the main application knows and uses. Cheers, Sebas -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44736#44736 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] What callback for setting the viewMatrix of the camera every frame?
Hi Sebas, On 10 January 2012 17:54, Sebas Walther wrote: > The main application manages the camera manipulators itself. My program is > only a plugin for this application. What if another programer wants to build > a new camera manipulator for the main application? It will be difficult and > annoying to write a custom manipulator for every manipulator the main > application knows and uses. There is a limit to how much one can provide in just a plugin, if you want to modify the viewer then you really need access to the viewer. You can be access to the current view in the event and cull traversals so perhaps this would the way forward. Or have the application publish an API for you to use to modify the views. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Help:How to control rasterization stage through osg?
Hello, we know that in openGL rendering pipeline, there is a stage called rasterization after per-vertex operation and before per-fragment operation. In rasterization stage, openGl generates certain properties (e.g. texture coordinates)for each fragment as a linear function of the eye-space or object-space or windows space coordinates. My question is , how to check which coordinate is used in osg implementations? And how to change the coordinate that is used? Thank you in advance. Best regards Shuiying ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
On 01/10/2012 02:55 PM, wang shuiying wrote: Hello, we know that in openGL rendering pipeline, there is a stage called rasterization after per-vertex operation and before per-fragment operation. In rasterization stage, openGl generates certain properties (e.g. texture coordinates)for each fragment as a linear function of the eye-space or object-space or windows space coordinates. My question is , how to check which coordinate is used in osg implementations? And how to change the coordinate that is used? The per-fragment attributes you're talking about are just interpolated from the same attributes that are assigned to the surrounding vertices. AFAIK, there's no way to change how these are computed, even with shaders (they're just simple linear interpolations). It sounds like you might actually be talking about TexGen (texture coordinate generation), which in the fixed-function world can be set to OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP. TexGen will automatically compute the texture coordinates on the vertices (which will then be interpolated for each fragment, as mentioned above). In OSG, the TexGen StateAttribute controls texture coordinate generation. If you're using shaders, it's up to you to do the texture coordinate generation math yourself. --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] What callback for setting the viewMatrix of the camera every frame?
Hi Robert, > if you want to modify the viewer then you really need access to the viewer I am not sure if I understand you correctly. I do have limited access to the viewer. It is for example possible to change the viewMatrix of the camera permanently if no camera manipulator is attached. The Problem is that my changes of the viewmatrix are overwritten if I use for example a TrackballManipulator. That is nothing new. That is the way it works. What is wrong with attaching a callback to my camera? I wrote a class that inherits from osg::Camera::DrawCallback(). So now I have the opportunity to set this callback as preDrawCallback to the camera. Isn't is possible that I change the viewmatrix in the operator()-method of my class if it is necessary? Or do I have an error in reasoning here? I want to change the viewMatrix AFTER the manipulator changed it but right BEFORE the frame is rendered. Thank you! Cheers, Sebas[/quote] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44741#44741 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
Hi, To Jason Daly, Thank you for your reply. In my case, I record positions of the vertexes in eye coordinate in vertex shader, and I want the rasterization to perform the linear interpolation function with eye coordinate so that I can get the position value of certain "vertex produced by interpolation". In a nutshell, I want to change the way how opengl interpolates such attributes as those defined by "varying variables" in vertex shader. So from your reply, only texture coordinates can be generated in different ways. As to general attributes, one has no way to change the interpolation method performed on them? Can I at least get to know, if can not change, the interpolation method used by the openGl in my implemention? Thank you. Shuiying Message: 16 Date: Tue, 10 Jan 2012 15:00:12 -0500 From: Jason Daly To: OpenSceneGraph Users Subject: Re: [osg-users] Help:How to control rasterization stage through osg? Message-ID:<4f0c98cc.8010...@ist.ucf.edu> Content-Type: text/plain; charset="ISO-8859-1"; format=flowed On 01/10/2012 02:55 PM, wang shuiying wrote: Hello, we know that in openGL rendering pipeline, there is a stage called rasterization after per-vertex operation and before per-fragment operation. In rasterization stage, openGl generates certain properties (e.g. texture coordinates)for each fragment as a linear function of the eye-space or object-space or windows space coordinates. My question is , how to check which coordinate is used in osg implementations? And how to change the coordinate that is used? The per-fragment attributes you're talking about are just interpolated from the same attributes that are assigned to the surrounding vertices. AFAIK, there's no way to change how these are computed, even with shaders (they're just simple linear interpolations). It sounds like you might actually be talking about TexGen (texture coordinate generation), which in the fixed-function world can be set to OBJECT_LINEAR, EYE_LINEAR, SPHERE_MAP, NORMAL_MAP, or REFLECTION_MAP. TexGen will automatically compute the texture coordinates on the vertices (which will then be interpolated for each fragment, as mentioned above). In OSG, the TexGen StateAttribute controls texture coordinate generation. If you're using shaders, it's up to you to do the texture coordinate generation math yourself. --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
On 01/10/2012 03:57 PM, wang shuiying wrote: So from your reply, only texture coordinates can be generated in different ways. As to general attributes, one has no way to change the interpolation method performed on them? I don't know of any way to change the rasterization behavior. As far as I know, that's still part of the fixed-function pipeline. I don't think there are even any parameters to control it, outside of the shade model, and anti-aliasing and multisampling parameters. Can I at least get to know, if can not change, the interpolation method used by the openGl in my implemention? Section 3.6 of the current OpenGL specification has all of the equations for this: http://www.opengl.org/registry/doc/glspec42.core.20110808.pdf --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
On 01/10/2012 03:57 PM, wang shuiying wrote: So from your reply, only texture coordinates can be generated in different ways. As to general attributes, one has no way to change the interpolation method performed on them? I don't know of any way to change the interpolation functions used for rasterization. As far as I know, that's still part of the fixed-function pipeline. I don't think there are even any parameters to control it, Can I at least get to know, if can not change, the interpolation method used by the openGl in my implemention? Section 3.6 of the current OpenGL specification has all of the equations for this: http://www.opengl.org/registry/doc/glspec42.core.20110808.pdf --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
On 1/10/2012 1:55 PM, Jason Daly wrote: On 01/10/2012 03:57 PM, wang shuiying wrote: Can I at least get to know, if can not change, the interpolation method used by the openGl in my implemention? Section 3.6 of the current OpenGL specification has all of the equations for this: http://www.opengl.org/registry/doc/glspec42.core.20110808.pdf Other sections too, 3.10.1 for example. Try searching the spec for "centroid" or "noperspective"; information on shader variable interpolation is scattered around in several places. I'd think simple linear interpolation could be accomplished using the noperspective qualifier: noperspective out vec3 eyeCoord; // for example ...but I haven't played with this. You might consider searching/posting at the opengl.org discussion boards. -Paul ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Help:How to control rasterization stage through osg?
On 01/10/2012 04:39 PM, Paul Martz wrote: Other sections too, 3.10.1 for example. Try searching the spec for "centroid" or "noperspective"; information on shader variable interpolation is scattered around in several places. I'd think simple linear interpolation could be accomplished using the noperspective qualifier: noperspective out vec3 eyeCoord; // for example ...but I haven't played with this. You might consider searching/posting at the opengl.org discussion boards. Good call, Paul. I don't remember hearing about the interpolation qualifiers. Those are covered in section 4.5 of the GLSL spec... http://www.opengl.org/registry/doc/GLSLangSpec.4.20.8.clean.pdf --"J" ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [vpb] Large VPB Database build fails without
Just a followup on this problem... If I run osgdem directly on the dted files, things build just fine. If I run vpbmaster on exactly the same dted files, it blows up with the error "no destination graph built, cannot proceed with build" in one of the tasks. It's not clear to me why osgdem works and vpbmaster does not on the same data set... :? Shayne -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44747#44747 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Sony Move.me
Greetings! Well, since no one reponded to my question, I assume that the answer is no - or they are too buzy hacking Kinects. Thanks! D Glenn David Glenn --- D Glenn 3D Computer Graphics & Media Systems. www.dglenn.com -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44748#44748 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [vpb] Large VPB Database build fails without
Hi Shayne, Yesterday me large database finished after more then one month precessing on 12 threads. Maybe we can now fix this issue. It's interesting that osgdem can build the identical database without errors! I'll try to recreate the problem in a small DB in the next week. Thank you! Cheers, Torben -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=44749#44749 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Search for plugins in . first
Sorry about the incorrect subject line before. I hate it when I do that :( > But I'm not talking about that usage. I'm talking to set it just for > your application. I have seen many commercial applications doing that ?a > launcher script that sets LD_LIBRARY_PATH *in that shell* and then > executes the process, so it uses the dynamic objects bundled with the > application instead of system ones. > > -- > Alberto > That's a good point; that's probably a safe way to use it. I tried setting LD_LIBRARY_PATH=. and it makes it so ./osgPlugins-version is searched but not . I haven't figured out why yet, but it must be some detail inside of OSG. However, I'm still leaning toward solving this problem with internal OSG functionality if possible since I want this app to be cross-platform and Windows does not have a direct equivalent to LD_LIBRARY_PATH. I'd rather use OSG behavior that is guaranteed to be consistent across platforms. > > Something like the FindFileCallback found in include/osgDB/Callbacks? > You can assign a FindFileCallback to osgDB::Options or the Registry. > I just tried this out and I think it gives me full flexibility. It looks like I can search however I want now and still keep using OSG_LIBRARY_PATH. I should have remembered this since I was experimenting with the findDataFile half of the callback a few months ago. Thank you both for the help. - Terry ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
