Re: [osg-users] Problem passing matrices as uniform
Hi
I think its wrong matrix multiplication order:
mvmatrix = _viewercam-getProjectionMatrix()*vmatrix*wmatrix;
should be
mvmatrix = wmatrix*vmatrix*_viewercam-getProjectionMatrix();
in osg to transform vertex you use v = v * m, in shaders it's opposite
Cheers,
Sergey.
12.08.2012, 12:59, Felix Meißgeier felixmeissge...@web.de:
Hey,
I can't find a solution. Maybe it helps if I post some code I extracted from
my project. It demonstrates my camera- and shader-setup. In the case I only
pass prjection-matrix to vertex-shader and replace testmatrix*gl_Vertex
with gl_ProjectionMatrix*testmatrix*gl_Vertex everything works fine. But
when I try to pass the whole modelviewprojection matrix it failed and nothing
of the scene is rendered.
Thanks for help!
osg-code:
Code:
struct TestCallback : public osg::Uniform::Callback{
TestCallback(osg::Camera* viewercam, osg::Camera* othercam)
:_viewercam(viewercam),_othercam(othercam){
}
virtual void operator () (osg::Uniform* uniform, osg::NodeVisitor* nv){
osg::Matrixd vmatrix=_viewercam-getViewMatrix();
//vmatrix=vmatrix.rotate(- M_PI / 2.0, 1, 0, 0);
osg::Matrixd wmatrix=osg::computeLocalToWorld(nv-getNodePath());
osg::Matrixd mvmatrix = _viewercam-getProjectionMatrix()*vmatrix*wmatrix;
uniform-set(mvmatrix);
}
osg::Camera* _viewercam;
osg::Camera* _othercam;
};
class MovementPostDrawCallback : public osg::Camera::DrawCallback{
public:
MovementPostDrawCallback(osg::PositionAttitudeTransform* patnode, double
velocity)
:_patnode(patnode),_velocity(velocity){
_startpos=_patnode-getPosition();
}
virtual void operator()(osg::RenderInfo renderinfo) const{
osg::Vec3 crtpos=_patnode-getPosition();
double
crttimestp=renderinfo.getState()-getFrameStamp()-getSimulationTime();
double bankangle=0.7;
crtpos[0]=_startpos[0]+sin(crttimestp)*100.0*_velocity;
bankangle=-sin(crttimestp)/2;
_patnode-setPosition(crtpos);
_patnode-setAttitude(osg::Quat(0.0, osg::X_AXIS, bankangle, osg::Y_AXIS,
0.0, osg::Z_AXIS));
}
osg::PositionAttitudeTransform* _patnode;
osg::Vec3 _startpos;
double _velocity;
};
bool loadShaderSrcFiles(std::string vssrcfile, osg::Shader* vs, std::string
fssrcfile, osg::Shader* fs){
bool returnval=true;
if(!vs-loadShaderSourceFromFile(vssrcfile)){
osg::notify(osg::WARN)Error while loading vertexshader-sourcefile
(vssrcfile)...;
returnval=false;
}
if(!fs-loadShaderSourceFromFile(fssrcfile))
osg::notify(osg::WARN)Error while loading fragmentshader-sourcefile
(fssrcfile)...;
return returnval;
}
int _tmain(int argc, _TCHAR* argv[])
{
osg::setNotifyLevel( osg::WARN );
int width=800;
int height=600;
osg::Vec2 displayres(width,height);
std::coutsetup scene...\n;
//setup scene
SceneBuilder sbuilder;
osg::Node* root = sbuilder.buildSubgraph();
std::coutscene built...\n;
//setup texture
osg::ref_ptrosg::Texture2D texture = new osg::Texture2D();
texture-setTextureSize(width,height);
texture-setInternalFormat(GL_RGBA);
texture-setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture-setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
//rtt cam
osg::ref_ptrosg::Camera rttcam = new osg::Camera();
rttcam-setViewport(0,0,width, height);
rttcam-setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
rttcam-setClearColor(osg::Vec4(105/255.0,125/255.0,202/255.0,1.0));
rttcam-setRenderOrder(osg::Camera::PRE_RENDER,1);
rttcam-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
rttcam-setReferenceFrame(osg::Transform::RELATIVE_RF);
rttcam-setProjectionMatrix(osg::Matrixd::identity());
rttcam-attach(osg::Camera::COLOR_BUFFER, texture.get());
rttcam-addChild(root);
rttcam-setPostDrawCallback(new
MovementPostDrawCallback(sbuilder.getCessnaPAT(),0.8));
rttcam-setName(RTTCam);
std::coutrttcam created...\n;
//setup postrender-geode
osg::ref_ptrosg::Geometry prquad =
osg::createTexturedQuadGeometry(osg::Vec3(),osg::Vec3(width,0.0,0.0),osg::Vec3(0.0,height,0.0));
osg::ref_ptrosg::Geode prgeode = new osg::Geode();
prgeode-addDrawable(prquad.get());
prgeode-setName(PostRenderDisplayGeode);
prquad-getOrCreateStateSet()-setTextureAttributeAndModes(0,texture.get(),osg::StateAttribute::ON);
prquad-setName(PostRenderDisplayQuad);
//visualisation
osg::ref_ptrosg::Camera scenecam = new osg::Camera();
scenecam-setViewport(0,0,width, height);
scenecam-setClearMask(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT);
scenecam-setClearColor(osg::Vec4(1.0,1.0,1.0,1.0));
scenecam-setRenderOrder(osg::Camera::NESTED_RENDER);
scenecam-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
scenecam-setReferenceFrame(osg::Camera::ABSOLUTE_RF);
scenecam-setProjectionMatrix(osg::Matrix::ortho2D(0,width,0,height));
scenecam-addChild(prgeode.get());
Re: [osg-users] Problem passing matrices as uniform
Hi, yes I also recognized this as the main-mistake this morning... anyway thanks for help ! regards, Felix -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49244#49244 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Problem passing matrices as uniform
Hey,
I can't find a solution. Maybe it helps if I post some code I extracted from my
project. It demonstrates my camera- and shader-setup. In the case I only pass
prjection-matrix to vertex-shader and replace testmatrix*gl_Vertex with
gl_ProjectionMatrix*testmatrix*gl_Vertex everything works fine. But when I
try to pass the whole modelviewprojection matrix it failed and nothing of the
scene is rendered.
Thanks for help!
osg-code:
Code:
struct TestCallback : public osg::Uniform::Callback{
TestCallback(osg::Camera* viewercam, osg::Camera* othercam)
:_viewercam(viewercam),_othercam(othercam){
}
virtual void operator () (osg::Uniform* uniform, osg::NodeVisitor* nv){
osg::Matrixd vmatrix=_viewercam-getViewMatrix();
//vmatrix=vmatrix.rotate(- M_PI / 2.0, 1, 0, 0);
osg::Matrixd wmatrix=osg::computeLocalToWorld(nv-getNodePath());
osg::Matrixd mvmatrix = _viewercam-getProjectionMatrix()*vmatrix*wmatrix;
uniform-set(mvmatrix);
}
osg::Camera* _viewercam;
osg::Camera* _othercam;
};
class MovementPostDrawCallback : public osg::Camera::DrawCallback{
public:
MovementPostDrawCallback(osg::PositionAttitudeTransform* patnode, double
velocity)
:_patnode(patnode),_velocity(velocity){
_startpos=_patnode-getPosition();
}
virtual void operator()(osg::RenderInfo renderinfo) const{
osg::Vec3 crtpos=_patnode-getPosition();
double
crttimestp=renderinfo.getState()-getFrameStamp()-getSimulationTime();
double bankangle=0.7;
crtpos[0]=_startpos[0]+sin(crttimestp)*100.0*_velocity;
bankangle=-sin(crttimestp)/2;
_patnode-setPosition(crtpos);
_patnode-setAttitude(osg::Quat(0.0, osg::X_AXIS, bankangle, osg::Y_AXIS,
0.0, osg::Z_AXIS));
}
osg::PositionAttitudeTransform* _patnode;
osg::Vec3 _startpos;
double _velocity;
};
bool loadShaderSrcFiles(std::string vssrcfile, osg::Shader* vs, std::string
fssrcfile, osg::Shader* fs){
bool returnval=true;
if(!vs-loadShaderSourceFromFile(vssrcfile)){
osg::notify(osg::WARN)Error while loading vertexshader-sourcefile
(vssrcfile)...;
returnval=false;
}
if(!fs-loadShaderSourceFromFile(fssrcfile))
osg::notify(osg::WARN)Error while loading fragmentshader-sourcefile
(fssrcfile)...;
return returnval;
}
int _tmain(int argc, _TCHAR* argv[])
{
osg::setNotifyLevel( osg::WARN );
int width=800;
int height=600;
osg::Vec2 displayres(width,height);
std::coutsetup scene...\n;
//setup scene
SceneBuilder sbuilder;
osg::Node* root = sbuilder.buildSubgraph();
std::coutscene built...\n;
//setup texture
osg::ref_ptrosg::Texture2D texture = new osg::Texture2D();
texture-setTextureSize(width,height);
texture-setInternalFormat(GL_RGBA);
texture-setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR);
texture-setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR);
//rtt cam
osg::ref_ptrosg::Camera rttcam = new osg::Camera();
rttcam-setViewport(0,0,width, height);
rttcam-setClearMask(GL_COLOR_BUFFER_BIT|GL_DEPTH_BUFFER_BIT);
rttcam-setClearColor(osg::Vec4(105/255.0,125/255.0,202/255.0,1.0));
rttcam-setRenderOrder(osg::Camera::PRE_RENDER,1);
rttcam-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
rttcam-setReferenceFrame(osg::Transform::RELATIVE_RF);
rttcam-setProjectionMatrix(osg::Matrixd::identity());
rttcam-attach(osg::Camera::COLOR_BUFFER, texture.get());
rttcam-addChild(root);
rttcam-setPostDrawCallback(new
MovementPostDrawCallback(sbuilder.getCessnaPAT(),0.8));
rttcam-setName(RTTCam);
std::coutrttcam created...\n;
//setup postrender-geode
osg::ref_ptrosg::Geometry prquad =
osg::createTexturedQuadGeometry(osg::Vec3(),osg::Vec3(width,0.0,0.0),osg::Vec3(0.0,height,0.0));
osg::ref_ptrosg::Geode prgeode = new osg::Geode();
prgeode-addDrawable(prquad.get());
prgeode-setName(PostRenderDisplayGeode);
prquad-getOrCreateStateSet()-setTextureAttributeAndModes(0,texture.get(),osg::StateAttribute::ON);
prquad-setName(PostRenderDisplayQuad);
//visualisation
osg::ref_ptrosg::Camera scenecam = new osg::Camera();
scenecam-setViewport(0,0,width, height);
scenecam-setClearMask(GL_DEPTH_BUFFER_BIT|GL_COLOR_BUFFER_BIT);
scenecam-setClearColor(osg::Vec4(1.0,1.0,1.0,1.0));
scenecam-setRenderOrder(osg::Camera::NESTED_RENDER);
scenecam-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT);
scenecam-setReferenceFrame(osg::Camera::ABSOLUTE_RF);
scenecam-setProjectionMatrix(osg::Matrix::ortho2D(0,width,0,height));
scenecam-addChild(prgeode.get());
scenecam-setName(SceneCam);
std::coutscenecam created...\n;
osg::ref_ptrosg::Group rootgroup = new osg::Group();
rootgroup-setName(RootGroup);
rootgroup-addChild(rttcam.get());
rootgroup-addChild(scenecam.get());
osgViewer::Viewer viewer;
viewer.setUpViewInWindow(250,50,width,height);
viewer.setSceneData(rootgroup.get());
osg::ref_ptrosg::Shader testverts = new osg::Shader(osg::Shader::VERTEX);
Re: [osg-users] Problem passing matrices as uniform
Hi, Felix I dont know for sure what matrix get returned from state, but if you get view\projection matrix from camera (or , for projection matrix - from osg::Projection) - it works perfectly fine, at least for me. Cheers, Sergey. 11.08.2012, 02:52, Felix Meißgeier felixmeissge...@web.de: Hey, i've got a problem passing modelview-matrix as uniform to a vertexshader. I want to realize a object-motion-blur-effect and so I need the previous-mv-matrix. More precisely I guess (not to say I'm sure) that my passed matrix doesn't work. I read about some difference between the orientations of the opengl- and osg-coordinate system. Could this be a reason, why the fixed-builtin-uniforms gl_ProjectionMatrix, gl_ModelViewMatrix,... work perfectly and my matrix doesn't?? For testing purpose I created a simple shader which bypasses the clipcoords of a vertex to fragmentshader (gl_Position) and sets gl_FragColor to white (using my own projection-matrix). The computation gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex worked fine, but gl_Position = myownprojmat * gl_ModelViewMatrix * gl_Vertex failed. I tried different ways to generate the proj-matrix. I got it from my (pre-render-) camera which is the parent of my scene-root and I tried Code: osgViewer::Viewer::Contexts contexts; _viewer-getContexts(contexts); pmatrix=contexts[0]-getState()-getProjectionMatrix(); During my tests passing the modelview-matrix I used the view-matrix of the parental-camera and the computelocaltoworld(osg::Nodepath)-function... Maybe anybody has an idea where I've got the mistake or has a tip how to implement this. Thank you! Cheers, Felix -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49235#49235 ___ 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] Problem passing matrices as uniform
Thanks for help! But the problem already exists. Actually the main-problem seems to be, that either the view-matrix or the world-(model-)matrix is not passed to the shader correctly. I have a scenegraph consisting of two rendertotexture-prerender-cams (one to compute a velocity map and one to actually render the scene to a texture) and of one nested-cam (scenecam, which adds the prerendered texture to a geometry and displays it). All cams are added to a group-node and latter is used as scenedata of a osgViewer::Viewer. Because of the fact, that I think, that something is wrong with the viewmatrix I want to make sure, that it's right to use the viewercam (viewer.getCamera()) or could there be a problem with the nested-cam??? thanks, regards Felix -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49237#49237 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Problem passing matrices as uniform
Hey, i've got a problem passing modelview-matrix as uniform to a vertexshader. I want to realize a object-motion-blur-effect and so I need the previous-mv-matrix. More precisely I guess (not to say I'm sure) that my passed matrix doesn't work. I read about some difference between the orientations of the opengl- and osg-coordinate system. Could this be a reason, why the fixed-builtin-uniforms gl_ProjectionMatrix, gl_ModelViewMatrix,... work perfectly and my matrix doesn't?? For testing purpose I created a simple shader which bypasses the clipcoords of a vertex to fragmentshader (gl_Position) and sets gl_FragColor to white (using my own projection-matrix). The computation gl_Position = gl_ProjectionMatrix * gl_ModelViewMatrix * gl_Vertex worked fine, but gl_Position = myownprojmat * gl_ModelViewMatrix * gl_Vertex failed. I tried different ways to generate the proj-matrix. I got it from my (pre-render-) camera which is the parent of my scene-root and I tried Code: osgViewer::Viewer::Contexts contexts; _viewer-getContexts(contexts); pmatrix=contexts[0]-getState()-getProjectionMatrix(); During my tests passing the modelview-matrix I used the view-matrix of the parental-camera and the computelocaltoworld(osg::Nodepath)-function... Maybe anybody has an idea where I've got the mistake or has a tip how to implement this. Thank you! Cheers, Felix -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=49235#49235 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
