Re: [osg-users] OSG and shaders
Hello everybody! Afeter some research on the net, I gathered some clues, day after day and I managed to make the shader i had to... just in part. I have no more problem with shaders! My only concern is now Openscenegraph. I don't understand AT ALL who has the knowledge of this language?? The research system on openscenegraph.org is UN-understandable, tutorials are cruelly missing in every field... The class guide is very useful... when you know what does the class and methods already! A simple explanation of one sentence could be great but there isn't any! So I'm back on the forum trying to get some help because it's impossible to do it alone. In my shader, i have to build a radial wave on textures (using normal light changes) by clicking. With fixed coordinates of the click, I managed to do it. I have the idea of how doing it for several clicks but I need arrays... I do know how to push_back but i don't know how to withdraw elements... I am stunned I can't find this information anywhere. Thank you if you can help me! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16131#16131 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Hi Hadrien, The learning curve for the OSG is pretty steep, I think we can all agree on that. However, if you have a good knowledge of graphics in general or OpenGL in particular, the transition to the OSG is fairly straightforward. Documentation can be sparse in some areas, but one should remember that the OSG is a free, fully featured scenegraph that is fully capable of rivalling the commercial alternatives. Providing comprehensive documentation of every function and class is an extremely time consuming task and I think it is more desirable to have extra functionality than a lesser featured scenegraph with masses of documentation. But anyway.. the way I and I think the majority of the people here learnt how to use the OSG is by looking at the examples in the source and then if that doesn't help, by looking at the OSG source itself. I have the idea of how doing it for several clicks but I need arrays... I do know how to push_back but i don't know how to withdraw elements... To be honest this doesn't sound like an OSG question but more of a general programming issue. Try looking at the documentation for osg::Array or indeed the STL vector. Regards, Kim. 2009/8/12 Hadrien Thomas thomas.hadr...@gmail.com: Hello everybody! Afeter some research on the net, I gathered some clues, day after day and I managed to make the shader i had to... just in part. I have no more problem with shaders! My only concern is now Openscenegraph. I don't understand AT ALL who has the knowledge of this language?? The research system on openscenegraph.org is UN-understandable, tutorials are cruelly missing in every field... The class guide is very useful... when you know what does the class and methods already! A simple explanation of one sentence could be great but there isn't any! So I'm back on the forum trying to get some help because it's impossible to do it alone. In my shader, i have to build a radial wave on textures (using normal light changes) by clicking. With fixed coordinates of the click, I managed to do it. I have the idea of how doing it for several clicks but I need arrays... I do know how to push_back but i don't know how to withdraw elements... I am stunned I can't find this information anywhere. Thank you if you can help me! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16131#16131 ___ 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] OSG and shaders
Hi, also see here: http://mew.cx/osg_glsl_july2005.pdf OpenSceneGraph Quick Start Guide http://www.lulu.com/content/paperback-book/openscenegraph-quick-start-guide/767629 Mail archives http://news.gmane.org/gmane.comp.graphics.openscenegraph.user OpenGL Shading Language http://www.amazon.com/OpenGL-Shading-Language-Randi-Rost/dp/0321637631/ To use GLSL and OSG effectively you will have to read a lot: books, web pages, mailing list archives and even code. All the information is out there. jp Hadrien Thomas wrote: Hello everybody! Afeter some research on the net, I gathered some clues, day after day and I managed to make the shader i had to... just in part. I have no more problem with shaders! My only concern is now Openscenegraph. I don't understand AT ALL who has the knowledge of this language?? The research system on openscenegraph.org is UN-understandable, tutorials are cruelly missing in every field... The class guide is very useful... when you know what does the class and methods already! A simple explanation of one sentence could be great but there isn't any! So I'm back on the forum trying to get some help because it's impossible to do it alone. In my shader, i have to build a radial wave on textures (using normal light changes) by clicking. With fixed coordinates of the click, I managed to do it. I have the idea of how doing it for several clicks but I need arrays... I do know how to push_back but i don't know how to withdraw elements... I am stunned I can't find this information anywhere. Thank you if you can help me! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16131#16131 ___ 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. MailScanner thanks Transtec Computers for their support. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
carnibirdy wrote: Hello everybody! Afeter some research on the net, I gathered some clues, day after day and I managed to make the shader i had to... just in part. I have no more problem with shaders! My only concern is now Openscenegraph. I don't understand AT ALL who has the knowledge of this language?? The research system on openscenegraph.org is UN-understandable, tutorials are cruelly missing in every field... The class guide is very useful... when you know what does the class and methods already! A simple explanation of one sentence could be great but there isn't any! So I'm back on the forum trying to get some help because it's impossible to do it alone. In my shader, i have to build a radial wave on textures (using normal light changes) by clicking. With fixed coordinates of the click, I managed to do it. I have the idea of how doing it for several clicks but I need arrays... I do know how to push_back but i don't know how to withdraw elements... I am stunned I can't find this information anywhere. Thank you if you can help me! Hi, As Kim and I told you, if you want to be cumfortable with OpenSceneGraph, the best is to cumfortable with OpenGL. Cheers, Max -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16137#16137 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
I've asked a friend what to do. He told me to look in the sources, which I am doing right now and might help me for every problem instead of coming here whining about the lack of documentation (which I now understand thanks to you Kim Bale). Beign a noob, I forgot OSG was opensource... He told me about the STL vector too, I hope I will find something there :P Thanks for your answers :) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16138#16138 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
OSG its self has over 140 examples, plus applications like OsgViewer , there are many more examples on the web, there are more tutorials on web and on the OSG Web site these will give you over 200 working examples and tutorials on how to use/ learn OSG. There's several FAQ's out on the web as well as the OSG site There is a an excellent Quick start Guide to OSG written by Paul Martz which you can down load for free But like anything you actually need to take the time and run the examples, work through tutorials to get an understanding. OSG is like many programming things you learn by doing and you have the advantage of access to the FULL source code so no black boxes, but to fully appreciate OSG or any other scene graph you need to have at least a good understanding of basic OpenGl , OSG in simplistic terms just wraps and extend Opengl to be more useful, You will find a lot of people here will help you and are much more tolerant than many other user groups ( http://www.catb.org/~esr/faqs/smart-questions.html ) , but just coming on and attacking OSG will likely turn many off helping out http://www.osgbooks.com/books/osg_qs.html http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials http://www.vis-sim.com/osg/index.htm http://www.openscenegraph.org/projects/osg/wiki/Support/UserGuides http://www.openscenegraph.org/projects/osg/wiki/Support/ProgrammingGuide s http://www.openscenegraph.org/projects/osg/wiki/Support/ReferenceGuides http://www.openscenegraph.org/projects/osg/wiki/Support/KnowledgeBase Gordon Product Manager 3d __ Gordon Tomlinson Email : gtomlinson @ overwatch.textron.com __ -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Hadrien Thomas Sent: Wednesday, August 12, 2009 7:33 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] OSG and shaders I've asked a friend what to do. He told me to look in the sources, which I am doing right now and might help me for every problem instead of coming here whining about the lack of documentation (which I now understand thanks to you Kim Bale). Beign a noob, I forgot OSG was opensource... He told me about the STL vector too, I hope I will find something there :P Thanks for your answers :) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=16138#16138 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.or g ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Thank you for the book reference. I will think about purchasing it. I can afford it but it's a big expense for me :-* For now, I'm still blocked with OSG. I want to map the same texture to the 6 faces of a cube. I made a Geometry called cube and 6 DrawElementsUInt called face1/2/.../6. I don't know how to setTexCoords to each QUADS. I thought about making 6 Geometry so I can use a same vertice several times but I don't find any method able to link them into a cube as a single geometry. Is there any other solution? Maybe I can do it with shaders but with so few experience I can't see the possibilities they bring. Thanks again for your help :) -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15889#15889 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
I agree with Paul, the Orange book is a *must have* title if you're learning shaders. http://books.google.co.uk/books?id=kDXOXv_GeswCdq=opengl+shader+languageprintsec=frontcoversource=bnhl=enei=E5Z6Svb-K5Cy-AbQ87lSsa=Xoi=book_resultct=resultresnum=5#v=onepageq=opengl%20shader%20languagef=false 2009/8/5 Paul Speed psp...@progeeks.com: And it deserves saying, if you can get your hands on an OpenGL Orange Book you'll be that many more steps ahead. I thought it was really good at explaining things in depth while also being easily navigated to drill in on target areas. I had complex shaders up and running in a few days with that book... I have had some embedded-style coding experience before, though. -Paul Maxime BOUCHER wrote: Well, I'm doing an internship too. At the beginning I didn't know osg at all, neither shaders. There are still an extraordinary amount of things I ignore about OSG (my advice: when you try to do or understand something, take a look at how it's done in OpenGL). Shaders aren't as hard to use as OSG, I discovered about one month ago and I can now write some modests but nice effects. The essential is to read code and tutorials. Don't try to go fast, it's the best way to misunderstand what you manipulate and to write bad code, failing your internship. You have 6 months, you can waste it OR spend 2 months to understand osg and shaders and then writting good code, masterizing your internship. Thus, first read a few osg tutorials (to understand how textures are mapped for example, it seems you don't), I think the 4 or 5 firsts should be enough. After, try to understand what is a shader (I guess you don't really). Then try to understand the shader tutorials from typhoonlabs, or this (http://www.siteduzero.com/tutoriel-3-8879-communiquer-avec-l-application-attributs-et-uniforms.html?bcsi-ac-20A76BC15DBD50F6=194870AE0303lbVE9ryZWUuZzrBgMzY7DS6IPWi9BwMAAMDCRwEQDgAAINVbBwA=), it's in french. I advice to look at osgshader example ONLY to understand (or copy the code) how to load and activate a shader, it's 5 lines. Don't take me for moralistic, I did these errors. Good luck and take your time, it's the best way to success. Cheers, Maxime -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15849#15849 ___ 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 mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Hi, carnibirdy wrote: For now, I'm still blocked with OSG. I want to map the same texture to the 6 faces of a cube. I made a Geometry called cube and 6 DrawElementsUInt called face1/2/.../6. I don't know how to setTexCoords to each QUADS. I thought about making 6 Geometry so I can use a same vertice several times but I can't find any method able to link them into a cube as a single geometry. Is there any other solution? Look at this: http://faculty.nps.edu/jasullivan/osgtutorials/ carnibirdy wrote: Maybe I can do it with shaders but with so few experience I can't see the possibilities they bring. It depends on what you want to do. It seems to me you don't want to do it this way. Cheers, Max -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15893#15893 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Hi, @btrall: Where do you find this ShaderGen? I found it neither in the classlist nor the osg examples. @carnibirdy: Rewritting the lights effects and texture mapping in the shader is quite easy. You can find implementation examples here (http://www.typhoonlabs.com/), in the OpenGL Shading Language Course part or here (http://www-evasion.imag.fr/Membres/Sebastien.Barbier/Enseignement/tp_glsl.zip) for several shaders, including a phong lighting. For the texture mapping see this post (http://forum.openscenegraph.org/viewtopic.php?t=3293). Have fun! Cheers, Maxime -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15829#15829 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
On 5/08/09 11:41 AM, Maxime BOUCHER wrote: @btrall: Where do you find this ShaderGen? I found it neither in the classlist nor the osg examples. It could be that it's not part of 2.8 but in trunk it's in: src/osgUtil/ShaderGen.cpp include/osgUtil/ShaderGen examples/osgshadergen/osgshadergen.cpp Cheers, /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Thank you for the links. I have already read them and found nothing useful at this stage. As every link I've read... The shaders codes are given without the mains, the mains without the shaders, the openscenegraph.org tutorials are with osgGL2 (which I can't work with), and there is no other tutorial on openscenegraph WITH shaders. I opened something like 300 links these past three days. I had to combine 5 of them to get to understand what is a shader, to load it and to write: gl_Position = ftransform(); gl_FragColor = gl_Color; for .vert and .frag One more day to know how to send the texture. And now I'm stuck with the mapping. Has anyone a long rope? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15845#15845 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Well, I'm doing an internship too. At the beginning I didn't know osg at all, neither shaders. There are still an extraordinary amount of things I ignore about OSG (my advice: when you try to do or understand something, take a look at how it's done in OpenGL). Shaders aren't as hard to use as OSG, I discovered about one month ago and I can now write some modests but nice effects. The essential is to read code and tutorials. Don't try to go fast, it's the best way to misunderstand what you manipulate and to write bad code, failing your internship. You have 6 months, you can waste it OR spend 2 months to understand osg and shaders and then writting good code, masterizing your internship. Thus, first read a few osg tutorials (to understand how textures are mapped for example, it seems you don't), I think the 4 or 5 firsts should be enough. After, try to understand what is a shader (I guess you don't really). Then try to understand the shader tutorials from typhoonlabs, or this (http://www.siteduzero.com/tutoriel-3-8879-communiquer-avec-l-application-attributs-et-uniforms.html?bcsi-ac-20A76BC15DBD50F6=194870AE0303lbVE9ryZWUuZzrBgMzY7DS6IPWi9BwMAAMDCRwEQDgAAINVbBwA=), it's in french. I advice to look at osgshader example ONLY to understand (or copy the code) how to load and activate a shader, it's 5 lines. Don't take me for moralistic, I did these errors. Good luck and take your time, it's the best way to success. Cheers, Maxime -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15849#15849 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Thank you very much, I was so desperate :\ -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15851#15851 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
And it deserves saying, if you can get your hands on an OpenGL Orange Book you'll be that many more steps ahead. I thought it was really good at explaining things in depth while also being easily navigated to drill in on target areas. I had complex shaders up and running in a few days with that book... I have had some embedded-style coding experience before, though. -Paul Maxime BOUCHER wrote: Well, I'm doing an internship too. At the beginning I didn't know osg at all, neither shaders. There are still an extraordinary amount of things I ignore about OSG (my advice: when you try to do or understand something, take a look at how it's done in OpenGL). Shaders aren't as hard to use as OSG, I discovered about one month ago and I can now write some modests but nice effects. The essential is to read code and tutorials. Don't try to go fast, it's the best way to misunderstand what you manipulate and to write bad code, failing your internship. You have 6 months, you can waste it OR spend 2 months to understand osg and shaders and then writting good code, masterizing your internship. Thus, first read a few osg tutorials (to understand how textures are mapped for example, it seems you don't), I think the 4 or 5 firsts should be enough. After, try to understand what is a shader (I guess you don't really). Then try to understand the shader tutorials from typhoonlabs, or this (http://www.siteduzero.com/tutoriel-3-8879-communiquer-avec-l-application-attributs-et-uniforms.html?bcsi-ac-20A76BC15DBD50F6=194870AE0303lbVE9ryZWUuZzrBgMzY7DS6IPWi9BwMAAMDCRwEQDgAAINVbBwA=), it's in french. I advice to look at osgshader example ONLY to understand (or copy the code) how to load and activate a shader, it's 5 lines. Don't take me for moralistic, I did these errors. Good luck and take your time, it's the best way to success. Cheers, Maxime -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15849#15849 ___ 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] OSG and shaders
Hi,
I found this tutorial which was very convenient:
http://www.openscenegraph.org/documentation/NPSTutorials/osgGL2ShaderIntro.htm
But the problem was the path of my shader files.
Now I have solved that, it compiles but there is still a problem remaining:
Code:
VERTEX glCompileShader FAILED
VERTEX Shader infolog:
0(3) : error C1008: undefined variable glPosition
0(3) : error C1008: undefined variable glProjectionMatrix
0(3) : error C1008: undefined variable glModelViewMatrix
0(3) : error C1008: undefined variable glVertex
glLinkProgram FAILED
Program infolog:
Vertex info
---
0(3) : error C1008: undefined variable glPosition
0(3) : error C1008: undefined variable glProjectionMatrix
0(3) : error C1008: undefined variable glModelViewMatrix
0(3) : error C1008: undefined variable glVertex
I give you my new code:
Code:
#include osgViewer/Viewer
#include osgViewer/ViewerEventHandlers
#include osgGA/StateSetManipulator
#include osgDB/ReadFile
#include osg/Uniform
#include osg/Geode
#include osg/Node
#include osg/Group
#include osg/Vec3
#include osg/Vec4
#include osg/ShapeDrawable
#include osg/Shader
#include osg/Program
#include osg/ref_ptr
int main(int ac, char **av)
{
osg::Vec4 red(1.0, 0.0, 0.0, 1.0);
osg::setNotifyLevel(osg::NOTICE);
// Viewer init
osgViewer::Viewer viewer;
viewer.addEventHandler(new
osgGA::StateSetManipulator(viewer.getCamera()-getOrCreateStateSet()));
viewer.addEventHandler(new osgViewer::StatsHandler());
//viewer.addEventHandler(new osgViewer::ThreadingHandler);
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
viewer.setUpViewInWindow(100, 100, 800, 600);
//root
osg::Group* rootNode = new osg::Group();
//objet de la scene
osg::Geode* MaGeode = new osg::Geode();
rootNode-addChild(MaGeode);
// Sphere
osg::ShapeDrawable* sd = new osg::ShapeDrawable;
osg::Sphere* mySphere = new osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f),
1.5f);
sd-setShape(mySphere);
sd-setColor(red);
MaGeode-addDrawable(sd);
//code to load and apply basic shader
osg::StateSet* rootState = rootNode-getOrCreateStateSet();
osg::ref_ptrosg::Program defaultProgramObject = new osg::Program;
//Read and attach the FRAGMENT shader
osg::Shader* shaderFrag = osgDB::readShaderFile(osg::Shader::FRAGMENT,
C:\\hadrien\\point.frag);
if (shaderFrag == NULL)
{
osg::notify(osg::NOTICE) Effect(frag) Not Supported ! std::endl;
return -1;
}
defaultProgramObject-addShader(shaderFrag);
//Read and attach the VERTEX shader
osg::Shader* shaderVert = osgDB::readShaderFile(osg::Shader::VERTEX,
C:\\hadrien\\vertshader.vert);
if (shaderVert == NULL)
{
osg::notify(osg::NOTICE) Effect(vert) Not Supported ! std::endl;
return -1;
}
defaultProgramObject-addShader(shaderVert);
//rootState-addUniform( new osg::Uniform( x, 50 ));
//rootState-addUniform( new osg::Uniform( y, 50 ));
//widgetState-addUniform(new osg::Uniform(drawWidth, 1));
//widgetState-addUniform(new osg::Uniform(drawColor,
osg::Vec4(255,0,0,255)));
rootState-setAttributeAndModes(defaultProgramObject,
osg::StateAttribute::ON);
viewer.setSceneData(rootNode);
viewer.run();
return (0);
}
vertshader.vert file:
Code:
void main ( )
{
glPosition=glProjectionMatrix*glModelViewMatrix*glVertex ;
}
point.frag file:
Code:
#version 110
uniform vec4 drawColor;
uniform int drawWidth;
uniform int x;
uniform int y;
void main(void)
{
gl_FragColor = gl_Color;
gl_FragColor.w = 1.0;
if (x = int(gl_FragCoord.x)-drawWidth x =
int(gl_FragCoord.x)+drawWidth
y = int(gl_FragCoord.y)-drawWidth y =
int(gl_FragCoord.y)+drawWidth)
{
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
}
Is there something missing?
--
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http://forum.openscenegraph.org/viewtopic.php?p=15766#15766
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Re: [osg-users] OSG and shaders
Hi Hadrien
0(3) : error C1008: undefined variable glPosition
0(3) : error C1008: undefined variable glProjectionMatrix
0(3) : error C1008: undefined variable glModelViewMatrix
0(3) : error C1008: undefined variable glVertex
GLSL functions all have the prefix gl_ not gl. i.e. glPosition should
be gl_Position.
Kim.
2009/8/4 Hadrien Thomas thomas.hadr...@gmail.com:
Hi,
I found this tutorial which was very convenient:
http://www.openscenegraph.org/documentation/NPSTutorials/osgGL2ShaderIntro.htm
But the problem was the path of my shader files.
Now I have solved that, it compiles but there is still a problem remaining:
Code:
VERTEX glCompileShader FAILED
VERTEX Shader infolog:
0(3) : error C1008: undefined variable glPosition
0(3) : error C1008: undefined variable glProjectionMatrix
0(3) : error C1008: undefined variable glModelViewMatrix
0(3) : error C1008: undefined variable glVertex
glLinkProgram FAILED
Program infolog:
Vertex info
---
0(3) : error C1008: undefined variable glPosition
0(3) : error C1008: undefined variable glProjectionMatrix
0(3) : error C1008: undefined variable glModelViewMatrix
0(3) : error C1008: undefined variable glVertex
I give you my new code:
Code:
#include osgViewer/Viewer
#include osgViewer/ViewerEventHandlers
#include osgGA/StateSetManipulator
#include osgDB/ReadFile
#include osg/Uniform
#include osg/Geode
#include osg/Node
#include osg/Group
#include osg/Vec3
#include osg/Vec4
#include osg/ShapeDrawable
#include osg/Shader
#include osg/Program
#include osg/ref_ptr
int main(int ac, char **av)
{
osg::Vec4 red(1.0, 0.0, 0.0, 1.0);
osg::setNotifyLevel(osg::NOTICE);
// Viewer init
osgViewer::Viewer viewer;
viewer.addEventHandler(new
osgGA::StateSetManipulator(viewer.getCamera()-getOrCreateStateSet()));
viewer.addEventHandler(new osgViewer::StatsHandler());
//viewer.addEventHandler(new osgViewer::ThreadingHandler);
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
viewer.setUpViewInWindow(100, 100, 800, 600);
//root
osg::Group* rootNode = new osg::Group();
//objet de la scene
osg::Geode* MaGeode = new osg::Geode();
rootNode-addChild(MaGeode);
// Sphere
osg::ShapeDrawable* sd = new osg::ShapeDrawable;
osg::Sphere* mySphere = new osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f),
1.5f);
sd-setShape(mySphere);
sd-setColor(red);
MaGeode-addDrawable(sd);
//code to load and apply basic shader
osg::StateSet* rootState = rootNode-getOrCreateStateSet();
osg::ref_ptrosg::Program defaultProgramObject = new osg::Program;
//Read and attach the FRAGMENT shader
osg::Shader* shaderFrag = osgDB::readShaderFile(osg::Shader::FRAGMENT,
C:\\hadrien\\point.frag);
if (shaderFrag == NULL)
{
osg::notify(osg::NOTICE) Effect(frag) Not Supported ! std::endl;
return -1;
}
defaultProgramObject-addShader(shaderFrag);
//Read and attach the VERTEX shader
osg::Shader* shaderVert = osgDB::readShaderFile(osg::Shader::VERTEX,
C:\\hadrien\\vertshader.vert);
if (shaderVert == NULL)
{
osg::notify(osg::NOTICE) Effect(vert) Not Supported ! std::endl;
return -1;
}
defaultProgramObject-addShader(shaderVert);
//rootState-addUniform( new osg::Uniform( x, 50 ));
//rootState-addUniform( new osg::Uniform( y, 50 ));
//widgetState-addUniform(new osg::Uniform(drawWidth, 1));
//widgetState-addUniform(new osg::Uniform(drawColor,
osg::Vec4(255,0,0,255)));
rootState-setAttributeAndModes(defaultProgramObject,
osg::StateAttribute::ON);
viewer.setSceneData(rootNode);
viewer.run();
return (0);
}
vertshader.vert file:
Code:
void main ( )
{
glPosition=glProjectionMatrix*glModelViewMatrix*glVertex ;
}
point.frag file:
Code:
#version 110
uniform vec4 drawColor;
uniform int drawWidth;
uniform int x;
uniform int y;
void main(void)
{
gl_FragColor = gl_Color;
gl_FragColor.w = 1.0;
if (x = int(gl_FragCoord.x)-drawWidth x =
int(gl_FragCoord.x)+drawWidth
y = int(gl_FragCoord.y)-drawWidth y =
int(gl_FragCoord.y)+drawWidth)
{
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
}
Is there something missing?
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Re: [osg-users] OSG and shaders
Thank you very much! I think I copied an error... what a big mistake :P That works! I can finally begin to see the effects of shaders! Fantastic! :P -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15773#15773 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Good afternoon, It's me again ^^ I tried some available shaders and i'm afraid that i don't understand at all how it works. It blows away all the textures and the lighting. Am I supposed to put them in the shaders? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15777#15777 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
If you add a shader to an object it removes all of the effects of OpenGL's fixed pipeline rendering. As a result if you want any of that fixed pipeline rendering back (such as lighting, texture mapping etc.) you will have to write an equivalent implementation within the shader. K. 2009/8/4 Hadrien Thomas thomas.hadr...@gmail.com: Good afternoon, It's me again ^^ I tried some available shaders and i'm afraid that i don't understand at all how it works. It blows away all the textures and the lighting. Am I supposed to put them in the shaders? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15777#15777 ___ 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] OSG and shaders
Ok. It's going to be a lot of work for me I guess :P Thank you for your help! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15780#15780 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Hadrien Thomas wrote on Tuesday, August 04, 2009 10:57 AM: Ok. It's going to be a lot of work for me I guess :P Thank you for your help! Perhaps osgUtil::ShaderGenVisitor and the osgshadergen example can help you out? They were designed to reproduce the fixed functionality pipeline in shaders. -- Bryan Thrall FlightSafety International bryan.thr...@flightsafety.com ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] OSG and shaders
Hi! I just registered to this forum. I hope I am not a kind of intruder or something. I am starting right now a 6 month internship. I have to build a library of effects with GLSL and OSG. The problem is that I'm not used to OSG (but I had some courses for OpenInventor which has the same system of graphs) at all and worst: I've never used shaders before. What do you recommand me to do? I don't understand any results of my searchs on openscenegraph.org about shaders. The search engine may have some issues, or I don't know how it works. Perhaps can you enlight me on some tutorials about how to use shaders from A to Z (just simple, I'm not begging for a complex thing but just how it works!) or where I can find any documentation. Thank you very much for your help. Hadrien. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15717#15717 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Hello Hadrien, You can find a basic introduction in the OSG Tutorials: http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials Another Tutorials about GLSL-Shaders can you find on the lighthouse website: http://www.lighthouse3d.com/opengl/glsl/ And the Quickref-Doc of GLSL is very useful. www.opengl.org/sdk/libs/OpenSceneGraph/glsl_quickref.pdf Cheers, Martin Am 03.08.2009 12:28, schrieb Hadrien Thomas: Hi! I just registered to this forum. I hope I am not a kind of intruder or something. I am starting right now a 6 month internship. I have to build a library of effects with GLSL and OSG. The problem is that I'm not used to OSG (but I had some courses for OpenInventor which has the same system of graphs) at all and worst: I've never used shaders before. What do you recommand me to do? I don't understand any results of my searchs on openscenegraph.org about shaders. The search engine may have some issues, or I don't know how it works. Perhaps can you enlight me on some tutorials about how to use shaders from A to Z (just simple, I'm not begging for a complex thing but just how it works!) or where I can find any documentation. Thank you very much for your help. Hadrien. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15717#15717 ___ 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] OSG and shaders
http://www.typhoonlabs.com/ Download chapters 1 through 5 and ShaderDesigner. Very very handy. There's also the orange book: (though I've not read it myself) http://www.amazon.com/OpenGL-Shading-Language-Randi-Rost/dp/0321637631 2009/8/3 Hadrien Thomas thomas.hadr...@gmail.com: Hi! I just registered to this forum. I hope I am not a kind of intruder or something. I am starting right now a 6 month internship. I have to build a library of effects with GLSL and OSG. The problem is that I'm not used to OSG (but I had some courses for OpenInventor which has the same system of graphs) at all and worst: I've never used shaders before. What do you recommand me to do? I don't understand any results of my searchs on openscenegraph.org about shaders. The search engine may have some issues, or I don't know how it works. Perhaps can you enlight me on some tutorials about how to use shaders from A to Z (just simple, I'm not begging for a complex thing but just how it works!) or where I can find any documentation. Thank you very much for your help. Hadrien. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15717#15717 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Thank you very much. I'll visit your links this afternoon! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15722#15722 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Simon Hammett wrote: http://www.typhoonlabs.com/ Download chapters 1 through 5 and ShaderDesigner. Very very handy. There's also the orange book: (though I've not read it myself) http://www.amazon.com/OpenGL-Shading-Language-Randi-Rost/dp/0321637631 That's exactly what I've done, these tutorials are really good. From the osg's shaders' example, I would say the most important is learning how to set the shaders in the scene graph. Have fun! Max -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15726#15726 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] OSG and shaders
Good evening ^^
I tried to paste some code from a co-worker but it doesnt seem to work and I
dont know why:
Main.cpp:
Code:
#include osgViewer/Viewer
#include osgViewer/ViewerEventHandlers
#include osgGA/StateSetManipulator
#include osgDB/ReadFile
#include osg/Uniform
#include osg/Geode
#include osg/Node
#include osg/Group
#include osg/Vec3
#include osg/Vec4
#include osg/ShapeDrawable
#include osg/Shader
#include osg/Program
#include osg/ref_ptr
#include iostream
int main(int ac, char **av)
{
osg::Vec4 red(1.0, 0.0, 0.0, 1.0);
osg::setNotifyLevel(osg::NOTICE);
// Viewer init
osgViewer::Viewer viewer;
viewer.addEventHandler(new
osgGA::StateSetManipulator(viewer.getCamera()-getOrCreateStateSet()));
viewer.addEventHandler(new osgViewer::StatsHandler());
//viewer.addEventHandler(new osgViewer::ThreadingHandler);
viewer.addEventHandler(new osgViewer::WindowSizeHandler);
viewer.setUpViewInWindow(100, 100, 800, 600);
//root
osg::Group* root = NULL;
root = new osg::Group();
//objet de la scene
osg::Geode* MaGeode=new osg::Geode();
// Sphere
osg::ShapeDrawable* sd = new osg::ShapeDrawable;
osg::Sphere* sphere = new osg::Sphere(osg::Vec3(0.0f, 0.0f, 0.0f),
1.5f);
sd-setShape(sphere);
sd-setColor(red);
MaGeode-addDrawable(sd);
//code to load and apply basic shader
osg::StateSet* widgetState = MaGeode-getOrCreateStateSet();
osg::ref_ptrosg::Program pgm = new osg::Program;
//Read the shader
osg::Shader* magnifierFrag = osgDB::readShaderFile(osg::Shader::FRAGMENT,
point.frag);
if (magnifierFrag == NULL)
{
osg::notify(osg::NOTICE) Effect Not Supported ! std::endl;
return 0;
}
pgm-addShader(magnifierFrag);
widgetState-addUniform( new osg::Uniform( x, 50 ));
widgetState-addUniform( new osg::Uniform( y, 50 ));
widgetState-addUniform(new osg::Uniform(drawWidth, 1));
widgetState-addUniform(new osg::Uniform(drawColor,
osg::Vec4(255,0,0,255)));
widgetState-setAttributeAndModes(pgm, osg::StateAttribute::ON );
root-addChild(MaGeode);
viewer.setSceneData(root);
viewer.run();
return (0);
}
I thought it was the includes but I have included everything.
The program runs without the part on the shaders.
I have my red Sphere.
But as soon as i input the shader part, i have the error Effect Not Supported
!
Here is the shader:
Code:
#version 110
uniform vec4 drawColor;
uniform int drawWidth;
uniform int x;
uniform int y;
void main(void)
{
gl_FragColor = gl_Color;
gl_FragColor.w = 1.0;
if (x = int(gl_FragCoord.x)-drawWidth x =
int(gl_FragCoord.x)+drawWidth
y = int(gl_FragCoord.y)-drawWidth y =
int(gl_FragCoord.y)+drawWidth)
{
gl_FragColor = vec4(1.0, 0.0, 0.0, 1.0);
}
}
Sorry if my mistake is so obvious, but it's out of my range for the moment.
Thank you if you can help!
I'll come back tomorrow.
Have a nice evening!
Ps: I just noticed that i dont know what are: drawWidth and drawColor. But if
it's not the main problem, can you tell me?
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Re: [osg-users] OSG and shaders
Ps: I just noticed that i dont know what are: drawWidth and drawColor. But if it's not the main problem, can you tell me? You're missing a vertex shader. Your program isn't linking. -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
