[osg-users] How to force reloading the texture in the shader
Hello to All,
I'm having a very specific issue using OpenSceneGraph. While using a texture
shader I developped, I need to attach a texture to my object. But my texture
need to be changed at each frame. However, I noticed that my texture is not
updated in the next viewer.update() if my computer is very fast. If I slow down
my computer it is correctly synchronized.
In other word, I'm looking for a way to way for a texture object to be
propagated in the gpu buffer before rendering the frame.
As I'm using OpenSceneGraph for simulation purpose even 1 frame offset is not
acceptable for me.
Basically the code can be summed up this way:
Code:
osg::Image IMAGE;
IMAGE-setImage(..., imageData, osg::Image::AllocationMode::NO_DELETE);
osg::StateSet *mystate = new osg::StateSet();
osg::Texture2D *texture = new osg::Texture2D();
texture-setImage(IMAGE);
(...)
for(int i=0;i!viewer-done();++i)
{
IMAGE-setImage(..., ImageData[i], osg::Image::AllocationMode::NO_DELETE);
viewer-frame(ctime);
}
In this example when rendering the scene OSG sometimes uses the ImageData of
index i-1 instead of index i
If anyone can help me I would be very happy.
Regards.
--
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http://forum.openscenegraph.org/viewtopic.php?p=42294#42294
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Re: [osg-users] How to force reloading the texture in the shader
Sergey. Thanks really A LOT for your fast and VERY EFFICIENT help. This problem drove me crazy for a while. The setting texture-setDataVariance(osg::Object::DYNAMIC) did not help but the viewer-setThreadingModel(osgViewer::ViewerBase::SingleThreaded) worked very well. Thanks again for your help. Regards. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=42301#42301 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Windows of the viewer freezing when in a separate thread (Boost)
Hey. Thanks Robert for your help. I just figured out what was the problem. In fact I was calling the constructor of the osgViewer in a different thread that the viewer.frame() function. This cause a quite strange issue as the viewer correctly render the scene but does not response to any manipulator. I guess this is due to the fact that the windows handlers are linked to the creation thread and not the execution thread. Thanks any way for your help. Have a great day. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=42259#42259 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Windows of the viewer freezing when in a separate thread (Boost)
Hello to All, I recently wanted to use OSG in a separate thread (a thread created with the Boost library) although I encounter a new issue. When I run the viewer in this separate thread the window that is created is completely frozen. The scene is correctly rendered in the window (and the scene is animated also) but the window is frozen meaning that I can't move/reduced/maximize the window. Also I can't anymore use the mouse to navigate in my scene (i have a camera manipulator). Of course I tested everything outside of this thread (in the main thread) and all the bugs disappeared. Can anyone help me about this problem ? I'm sure that I'm not the only one to face this problem but I couldn't find a post related in the forum. Feel free to redirect me to any pre-existing post if you know any. Thanks a lot for any answer. Have a good day. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=42247#42247 ___ 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
Hey Paul. Thanks for your answer no mater it is late or not. I'll test this during the week end and see whether I can achieve what I want. Your idea seems good although a bit tricky as I thought previously that it may an easy way to do this. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41591#41591 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Depth texture for Pixel/Fragment Shader
I may not have been clear enough. In few words I'd like to know how I can retrieve the depth texture corresponding to a spot light so I could implement light occlusion and light focusing. Any ideas ? Thanks. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41592#41592 ___ 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
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
[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] 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] 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
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
