[osg-users] sending array as uniform to GLSL
hello! By looking into Uniform class reference I figured out that there is no overloaded constructor for arrays (or int*, float* etc.). Is it even possible to have an array (stack and/or heap) as uniform? lg Christian -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=51323#51323 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Shader reloading
hello!
I'm trying to simulate noise effects in real time using OSG and GLSL.
I rendered to texture a scene to get a sampler2D. Mu and Sigma for noise
simulation are static. My idea is to reload fragment shader in a while loop
with a random number as uniform because GLSL's noise() function doesn't seem to
work on my computer. Therefore I wrote a function "randomNumber(int from, int
to)" which returns a random int between "from" and "to".
Code:
void loadNoiseShader(int width, int height, osg::Vec3d& mue, osg::Vec3d& sigma,
osg::Geode* geode)
{
osg::ref_ptr vertShader =
osgDB::readShaderFile(osg::Shader::VERTEX, "noise.vert");
osg::ref_ptr fragShader =
osgDB::readShaderFile(osg::Shader::FRAGMENT, "noise.frag");
osg::ref_ptr program = new osg::Program;
program->addShader(vertShader.get());
program->addShader(fragShader.get());
osg::StateSet* ss = geode->getOrCreateStateSet();
ss->setAttributeAndModes(program.get());
osg::ref_ptr texUniform = new osg::Uniform("RTScene", 0);
osg::ref_ptr windowSize = new osg::Uniform("screen",
osg::Vec2(width, height));
osg::ref_ptr mueUniform = new osg::Uniform("mue", mue);
osg::ref_ptr sigmaUniform = new osg::Uniform("sigma",
sigma);
osg::ref_ptr randomUniform = new osg::Uniform("random",
randomNumber(-255, 255));
ss->addUniform(texUniform.get());
ss->addUniform(windowSize.get());
ss->addUniform(sigmaUniform.get());
ss->addUniform(mueUniform.get());
ss->addUniform(randomUniform.get());
}
/*...*/
while(!viewer.done())
{
loadNoiseShader(width, height, mu, sigma, geode.get());
viewer.frame();
}
I thought that this would work, but unfortunately the executive crashes at the
beginning. Can someone explain me that please?
lg Chris
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[osg-users] image processing with OSG
Hello!
For one of my project I want to create an average image consisting of 10 images
captured by a static camera to erase camera noise. I tried this stuff with
OpenCV (http://opencv.willowgarage.com/wiki/) and its cv::Mat class and it
worked well.
I want to do the same with OSG by loading 10 PNGs into an array with
osgDB::readImageFile("pic.png") and recognized a big problem. For some reasons
osg::Image doesn't use methods to change pixel color, but only to get pixel
color (osg::Image::getColor(...)), and it doesn't return a reference.
Do you have any idea how to change pixel colors?
lg Christian
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Re: [osg-users] Render to texture, display pre-rendered scene
robertosfield wrote:
> Hi Christian,
>
> thank you
>
> Have a look at the osgdistortion example.
>
> Robert.
>
> On 25 June 2012 11:20, Christian Rumpf <> wrote:
>
> > Hey again. As I posted before I managed to render to texture a scene and
> > projected it onto a Geometry. But it is just an image of a scene and the
> > RTT camera can't move around my object ("cessna.osg").
> >
> > Is there a way to move the camera freely around like you would do with
> > viewer's camera?
> >
> > lg Christian
> >
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> > http://forum.openscenegraph.org/viewtopic.php?p=48474#48474
> >
> >
> >
> >
> >
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Re: [osg-users] Render to texture, display pre-rendered scene
Hey again. As I posted before I managed to render to texture a scene and
projected it onto a Geometry. But it is just an image of a scene and the RTT
camera can't move around my object ("cessna.osg").
Is there a way to move the camera freely around like you would do with viewer's
camera?
lg Christian
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Re: [osg-users] Render to texture, display pre-rendered scene
No need anymore, Robert. I finally a homepage which explains everything about render to texture: http://beefdev.blogspot.de/2012/01/render-to-texture-in-openscenegraph.html It really helped me, and I finally could load my shader files with texture as uniform sampler2D. Nevertheless thank you very much, Robert. lg Christian -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48176#48176 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Render to texture, display pre-rendered scene
This really sounds helpful, Robert, but for some reason this examples you recommended aren't understandable for me. They all tells about reflecting, printing it into a flag and so on. isn't there an example which just renders a single node, a single box or something else into a texture and projects it into the viewer? Just a single object, no camera effects, no artefacts, no movements, nothing but a single object. My problem is that all this examples (and I found a lot in the internet) explains how useful this RTT technique is, but aren't understandable after all. This sounds like I'm not good in graphics programming, but sometimes small steps are necessary. I can't take this big stuffs as start. lg Christian -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=48171#48171 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Render to texture, display pre-rendered scene
Hey!
I read nearly everything about render to texture techniques and what you can do
with them, but not how to SIMPLY display it. My intention is to pre-render the
scene into a texture and sending this texture into my fragment shader (GLSL) to
simulate blur effects.
But before I can do this shading stuff I need to display this pre-rendered
scene and I don't know how to do it. Here my code so you can see what I
programmed:
Code:
#include
#include
#include
#include
#include
#include
osg::Camera* createRTTCamera(int width, int height, osg::Texture2D* texture)
{
texture->setTextureSize(width, height);
texture->setInternalFormat(GL_RGB);
texture->setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture->setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
osg::ref_ptr rttCamera = new osg::Camera;
rttCamera->setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
rttCamera->setClearColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f));
rttCamera->setViewport(0, 0, width, height);
rttCamera->setRenderOrder(osg::Camera::PRE_RENDER);
rttCamera->setReferenceFrame(osg::Transform::RELATIVE_RF);
rttCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
rttCamera->attach(osg::Camera::COLOR_BUFFER, texture);
return rttCamera.release();
}
int main(int argc, char** argv)
{
osg::ref_ptr model = osgDB::readNodeFile("cessna.osg");
osg::ref_ptr texture = new osg::Texture2D;
osg::ref_ptr camera = createRTTCamera(1600, 900,
texture.get());
camera->addChild(model.get());
osg::StateSet* ss = model->getOrCreateStateSet();
ss->setTextureAttributeAndModes(0, texture.get(),
osg::StateAttribute::ON);
osg::ref_ptr root = new osg::Group;
root->addChild(camera.get());
osgViewer::Viewer viewer;
viewer.setSceneData(root.get());
return viewer.run();
}
By running this code I get nothing, only if I add this line before my viewer my
plane appears:
Code:
root->addChild(model.get());
Can someone help me out?
lg Christian
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[osg-users] [osgPPU] Problems installing osgPPU using cmake 2.8.4
I tried to install the latest osgPPU version I found today, using cmake 2.8.4 and Visual Studio 10, but when i started to configure the folder I got the following cmake-error: > Check for working C compiler using: Visual Studio 10 > Check for working C compiler using: Visual Studio 10 -- works > Detecting C compiler ABI info > Detecting C compiler ABI info - done > Check for working CXX compiler using: Visual Studio 10 > Check for working CXX compiler using: Visual Studio 10 -- works > Detecting CXX compiler ABI info > Detecting CXX compiler ABI info - done > Found OpenGL: opengl32 > CUDA installation wasn't found > Could not find nvcc, CUDA examples wouldn't be built > Could not find cudart library (cudart) > Could not find cuda libraries. > CMake Warning (dev) at CMakeLists.txt:45 (INCLUDE): > Policy CMP0011 is not set: Included scripts do automatic cmake_policy PUSH > and POP. Run "cmake --help-policy CMP0011" for policy details. Use the > cmake_policy command to set the policy and suppress this warning. > > The included script > > C:/osgPPU-0.4.0/CMakeModules/cuda/FindCuda.cmake > > affects policy settings. CMake is implying the NO_POLICY_SCOPE option for > compatibility, so the effects are applied to the including context. > This warning is for project developers. Use -Wno-dev to suppress it. > > CMake Error: The following variables are used in this project, but they are > set to NOTFOUND. > Please set them or make sure they are set and tested correctly in the CMake > files: > OPENTHREADS_LIBRARY_RELEASE > linked by target "osgppu_hdr" in directory C:/osgPPU-0.4.0/src/example/hdr > linked by target "osgppu_viewer" in directory > C:/osgPPU-0.4.0/src/example/viewer > linked by target "osgppu_dof" in directory C:/osgPPU-0.4.0/src/example/dof > linked by target "osgppu_cubemap" in directory > C:/osgPPU-0.4.0/src/example/cubemap > linked by target "osgppu_texture3D" in directory > C:/osgPPU-0.4.0/src/example/texture3D > linked by target "osgppu_video" in directory > C:/osgPPU-0.4.0/src/example/video > linked by target "osgppu_ssao" in directory > C:/osgPPU-0.4.0/src/example/ssao > linked by target "osgppu_glow" in directory > C:/osgPPU-0.4.0/src/example/glow > linked by target "osgPPU" in directory C:/osgPPU-0.4.0/src/osgPPU > OSGDB_LIBRARY_RELEASE > linked by target "osgppu_hdr" in directory C:/osgPPU-0.4.0/src/example/hdr > linked by target "osgppu_viewer" in directory > C:/osgPPU-0.4.0/src/example/viewer > linked by target "osgppu_dof" in directory C:/osgPPU-0.4.0/src/example/dof > linked by target "osgppu_cubemap" in directory > C:/osgPPU-0.4.0/src/example/cubemap > linked by target "osgppu_texture3D" in directory > C:/osgPPU-0.4.0/src/example/texture3D > linked by target "osgppu_video" in directory > C:/osgPPU-0.4.0/src/example/video > linked by target "osgppu_ssao" in directory > C:/osgPPU-0.4.0/src/example/ssao > linked by target "osgppu_glow" in directory > C:/osgPPU-0.4.0/src/example/glow > linked by target "osgPPU" in directory C:/osgPPU-0.4.0/src/osgPPU > OSGGA_LIBRARY_RELEASE > linked by target "osgppu_hdr" in directory C:/osgPPU-0.4.0/src/example/hdr > linked by target "osgppu_viewer" in directory > C:/osgPPU-0.4.0/src/example/viewer > linked by target "osgppu_dof" in directory C:/osgPPU-0.4.0/src/example/dof > linked by target "osgppu_cubemap" in directory > C:/osgPPU-0.4.0/src/example/cubemap > linked by target "osgppu_texture3D" in directory > C:/osgPPU-0.4.0/src/example/texture3D > linked by target "osgppu_video" in directory > C:/osgPPU-0.4.0/src/example/video > linked by target "osgppu_ssao" in directory > C:/osgPPU-0.4.0/src/example/ssao > linked by target "osgppu_glow" in directory > C:/osgPPU-0.4.0/src/example/glow > OSGTEXT_LIBRARY_RELEASE > linked by target "osgppu_hdr" in directory C:/osgPPU-0.4.0/src/example/hdr > linked by target "osgppu_viewer" in directory > C:/osgPPU-0.4.0/src/example/viewer > linked by target "osgppu_dof" in directory C:/osgPPU-0.4.0/src/example/dof > linked by target "osgppu_cubemap" in directory > C:/osgPPU-0.4.0/src/example/cubemap > linked by target "osgppu_texture3D" in directory > C:/osgPPU-0.4.0/src/example/texture3D > linked by target "osgppu_video" in directory > C:/osgPPU-0.4.0/src/example/video > linked by target "osgppu_ssao" in directory > C:/osgPPU-0.4.0/src/example/ssao > linked by target "osgppu_glow" in directory > C:/osgPPU-0.4.0/src/example/glow > linked by target "osgPPU" in directory C:/osgPPU-0.4.0/src/osgPPU > OSGUTIL_LIBRARY_RELEASE > linked by target "osgppu_hdr" in directory C:/osgPPU-0.4.0/src/example/hdr > linked by target "osgppu_viewer" in directory > C:/osgPPU-0.4.0/src/example/viewer > linked by target "osgppu_dof" in directory C:/osgPPU-0.4.0/src/example/dof > linked by target "osgppu_cubemap" in directory > C:/osgPPU
[osg-users] osgDB::readImageFile don't work correctly
Hi,
I wanted to experiment a little bit with osg::Image, but when I used
osgDB::readImageFile("..."); in my beginner's guide to read a png, I got the
following message:
> Warning: Could not find plugin to read objects from file "clockface.jpg".
I installed osg-library according to osg guide with cmake for VS 2010. Does
somebody know what the issue could be?
lg Christian
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Re: [osg-users] OSG fragment shader
the image processing effect should work in realtime (i.e. blur shading). shall I send the texture coordinates from vertex shader into fragment shader or is it ok to just use a fragment shader for image processing? My intenstion: I have to create a scene where I can freely move my camera. I can either load one of the prepared *.osg files OR create some drawables and let them display it with osg::Viewer (as I know you just need 5-10 lines for that). I heard of a method called render-to-texture, but I'm not sure if this is efficient for realtime shading. lg Christian -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=47969#47969 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] OSG fragment shader
Hello everyone!
I just learned GLSL and image processing using different filter masks. Now I
want to implement this into my OSG-project, but my test object (a cow ^^) is
black, totally black.
For the beginning I used the following code for fragment shader:
Code:
uniform sampler2D image;
void main()
{
gl_FragColor = texture2D(image, gl_FragCoord.xy);
}
glShaderCompiler said that this code is ok, no errors, but still my test object
is black.
My Question:
How do I uniform sampler2D which should be my realtime output image?
lg Christian
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