Re: [osg-users] Problem using osg::ColorMatrix
Hi Rahul. If I recall correctly the color matrix isn't working on most
consumer cards. You need the the GL_ARB_IMAGING extension.
Alternatively you can achieve the desired effect with a shader.
cheers
psy
Hi all,
I am trying to use OpenFL color matrix functionality through
osg::ColorMatrix but not able to do so. When i apply this to a node
|(cessna.osg) i do not see any effect. I am pasting the code below for
you guys to have a look.
I don't know what am i doing wrong in this simple piece of code .
cheers RJ
int main(int argc, char** argv)
{
osg::MatrixTransform* cessnaMT = new osg::MatrixTransform;
osg::Node* cessna = osgDB::readNodeFile(cessna.osg);
cessnaMT-addChild(cessna);
// Set color matrix
osg::ColorMatrix* colorMatrix = new osg::ColorMatrix;
const osg::Matrix cm (0.15, 0.0, 0.0, 0.0,
0.0, 0.3, 0.0, 0.0,
0.05, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0);
colorMatrix-setMatrix(cm);
cessnaMT-getOrCreateStateSet()-setAttributeAndModes(colorMatrix,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
osgViewer::Viewer viewer;
// add model to viewer.
viewer.setSceneData(cessnaMT);
viewer.run();
return 0;
}
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Re: [osg-users] Problem using osg::ColorMatrix
Hi Ulrich, Thanks for the reply, you are absolutely right, color matrix is part of imaging subset which is used during pixel transfer operation. The concept just slipped out of my mind ;) thanks for the correcting my thoughts cheers RJ Ulrich Hertlein wrote: Hi Rahul, Rahul Jain wrote: Color matrix in OpenGL is used for color space conversion, for example using color matric you can convert RGB to BGR , RGB to CMY. Unfortunately i do not have any screen grabs for the moment, but i am trying to achieve night vision effect using this code , doesn't the color matrix only affect pixel transfer operations? Like texture upload/download, framebuffer reads and such? So you can't use it to modify object appearance on the fly. /ulrich ___ 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] Problem using osg::ColorMatrix
Hi all,
I am trying to use OpenFL color matrix functionality through
osg::ColorMatrix but not able to do so. When i apply this to a node
|(cessna.osg) i do not see any effect. I am pasting the code below for
you guys to have a look.
I don't know what am i doing wrong in this simple piece of code .
cheers RJ
int main(int argc, char** argv)
{
osg::MatrixTransform* cessnaMT = new osg::MatrixTransform;
osg::Node* cessna = osgDB::readNodeFile(cessna.osg);
cessnaMT-addChild(cessna);
// Set color matrix
osg::ColorMatrix* colorMatrix = new osg::ColorMatrix;
const osg::Matrix cm (0.15, 0.0, 0.0, 0.0,
0.0, 0.3, 0.0, 0.0,
0.05, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0);
colorMatrix-setMatrix(cm);
cessnaMT-getOrCreateStateSet()-setAttributeAndModes(colorMatrix,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
osgViewer::Viewer viewer;
// add model to viewer.
viewer.setSceneData(cessnaMT);
viewer.run();
return 0;
}
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Re: [osg-users] Problem using osg::ColorMatrix
Having never used a ColorMatrix in OpenGL or OSG
What effect is this supposed to produce ?
Do you have screen grabs of what it should look like if done in raw Opengl ?
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rahul Jain
Sent: Monday, July 28, 2008 10:40 AM
To: 'OpenSceneGraph Users'
Subject: [osg-users] Problem using osg::ColorMatrix
Hi all,
I am trying to use OpenFL color matrix functionality through
osg::ColorMatrix but not able to do so. When i apply this to a node
|(cessna.osg) i do not see any effect. I am pasting the code below for
you guys to have a look.
I don't know what am i doing wrong in this simple piece of code .
cheers RJ
int main(int argc, char** argv)
{
osg::MatrixTransform* cessnaMT = new osg::MatrixTransform;
osg::Node* cessna = osgDB::readNodeFile(cessna.osg);
cessnaMT-addChild(cessna);
// Set color matrix
osg::ColorMatrix* colorMatrix = new osg::ColorMatrix;
const osg::Matrix cm (0.15, 0.0, 0.0, 0.0,
0.0, 0.3, 0.0, 0.0,
0.05, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0);
colorMatrix-setMatrix(cm);
cessnaMT-getOrCreateStateSet()-setAttributeAndModes(colorMatrix,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
osgViewer::Viewer viewer;
// add model to viewer.
viewer.setSceneData(cessnaMT);
viewer.run();
return 0;
}
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Re: [osg-users] Problem using osg::ColorMatrix
Hi Gordon,
Color matrix in OpenGL is used for color space conversion, for example
using color matric you can convert RGB to BGR , RGB to CMY.
Unfortunately i do not have any screen grabs for the moment, but i am
trying to achieve night vision effect using this code ,
RJ
Gordon Tomlinson wrote:
Having never used a ColorMatrix in OpenGL or OSG
What effect is this supposed to produce ?
Do you have screen grabs of what it should look like if done in raw Opengl ?
-Original Message-
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Rahul Jain
Sent: Monday, July 28, 2008 10:40 AM
To: 'OpenSceneGraph Users'
Subject: [osg-users] Problem using osg::ColorMatrix
Hi all,
I am trying to use OpenFL color matrix functionality through
osg::ColorMatrix but not able to do so. When i apply this to a node
|(cessna.osg) i do not see any effect. I am pasting the code below for
you guys to have a look.
I don't know what am i doing wrong in this simple piece of code .
cheers RJ
int main(int argc, char** argv)
{
osg::MatrixTransform* cessnaMT = new osg::MatrixTransform;
osg::Node* cessna = osgDB::readNodeFile(cessna.osg);
cessnaMT-addChild(cessna);
// Set color matrix
osg::ColorMatrix* colorMatrix = new osg::ColorMatrix;
const osg::Matrix cm (0.15, 0.0, 0.0, 0.0,
0.0, 0.3, 0.0, 0.0,
0.05, 0.0, 0.0, 0.0,
0.0, 0.0, 0.0, 1.0);
colorMatrix-setMatrix(cm);
cessnaMT-getOrCreateStateSet()-setAttributeAndModes(colorMatrix,
osg::StateAttribute::OVERRIDE | osg::StateAttribute::ON);
osgViewer::Viewer viewer;
// add model to viewer.
viewer.setSceneData(cessnaMT);
viewer.run();
return 0;
}
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Re: [osg-users] Problem using osg::ColorMatrix
Hi Rahul, Rahul Jain wrote: Color matrix in OpenGL is used for color space conversion, for example using color matric you can convert RGB to BGR , RGB to CMY. Unfortunately i do not have any screen grabs for the moment, but i am trying to achieve night vision effect using this code , doesn't the color matrix only affect pixel transfer operations? Like texture upload/download, framebuffer reads and such? So you can't use it to modify object appearance on the fly. /ulrich ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
