Hi, Marcus:
First, I set up the render to color texture camera, and set the render order
to PRE_RENDER, and the render target to FRAME_BUFFER_OBJECT, then I set up
the render to normal and depth texture camera, with the same render order
and render target. I use the uniform variable to tell the GLSL what to set
to gl_FragColor, if RENDERNORMALANDDEPTH is set false, the gl_FragColor is
set to the shaded color, otherwise, I set the normalized normal vector in
the RGB tunnel of the gl_FragColor, and the depth value in the A tunnel of
the gl_FragColor.
Now, I have the color and depth texture, I can set a POST_RENDER hud to
render synthetic texture and use these two textures as the input, and do
some calculation in this camera's shader.
I'm not sure whether I have expressed this clear or not, anyway, I'm just
gonna paste my code here, and if you have any questions, feel free to
discuss.
Actually, I got a problem myself here, I want to do some more post render
process like antialias even after the silhouette pass, I don't know how to
set some later render camera. Anyone who knows please tell me.
/***************************************************************************
***********************************/
osg::ref_ptr<osg::Texture2D> colorTexture = new osg::Texture2D;
colorTexture->setTextureSize(windowWidth, windowHeight);
colorTexture->setInternalFormat(GL_RGBA);
colorTexture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR);
colorTexture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR);
colorTexture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_TO_BORDER
);
colorTexture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_TO_BORDER
);
colorTexture->setBorderColor(osg::Vec4(1.0f,1.0f,1.0f,1.0f));
// set up the render to color texture camera.
{
osg::ref_ptr<osg::Camera> colorCamera = new osg::Camera;
colorCamera->setName("ColorCamera");
colorCamera->setClearColor(clearColor);
colorCamera->setViewport(0,0,windowWidth,windowHeight);
//colorCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
//colorCamera->setViewport(the_viewport.get());
//colorCamera->setProjectionMatrix(proj_matrix);
//colorCamera->setViewMatrix(view_matrix);
colorCamera->setRenderOrder(osg::Camera::PRE_RENDER);
colorCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT)
;
colorCamera->attach(osg::Camera::COLOR_BUFFER,
colorTexture.get());
colorCamera->addChild(viewnode);
osg::ref_ptr<osg::StateSet> stateset =
colorCamera->getOrCreateStateSet();
stateset->addUniform(new
osg::Uniform("RENDERNORMALANDDEPTH",false),osg::StateAttribute::ON);
root->addChild(colorCamera.get());
}
osg::ref_ptr<osg::Texture2D> normalAndDepthTexture = new
osg::Texture2D;
normalAndDepthTexture->setTextureSize(windowWidth, windowHeight);
normalAndDepthTexture->setInternalFormat(GL_RGBA);
normalAndDepthTexture->setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::
LINEAR);
normalAndDepthTexture->setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::
LINEAR);
normalAndDepthTexture->setWrap(osg::Texture2D::WRAP_S,osg::Texture2D::CLAMP_
TO_BORDER);
normalAndDepthTexture->setWrap(osg::Texture2D::WRAP_T,osg::Texture2D::CLAMP_
TO_BORDER);
// set up the render to normal and depth texture camera.
{
osg::ref_ptr<osg::Camera> normalAndDepthCamera = new
osg::Camera;
normalAndDepthCamera->setName("NormalAndDepthCamera");
normalAndDepthCamera->setClearColor(clearColor);
normalAndDepthCamera->setViewport(0,0,windowWidth,windowHeight);
//normalAndDepthCamera->setViewport(the_viewport.get());
//normalAndDepthCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
//normalAndDepthCamera->setProjectionMatrix(proj_matrix);
//normalAndDepthCamera->setViewMatrix(view_matrix);
normalAndDepthCamera->setRenderOrder(osg::Camera::PRE_RENDER);
normalAndDepthCamera->setRenderTargetImplementation(osg::Camera::FRAME_BUFFE
R_OBJECT);
normalAndDepthCamera->attach(osg::Camera::COLOR_BUFFER,
normalAndDepthTexture.get());
normalAndDepthCamera->addChild(viewnode);
osg::ref_ptr<osg::StateSet> depstateset =
normalAndDepthCamera->getOrCreateStateSet();
depstateset->addUniform(new
osg::Uniform("RENDERNORMALANDDEPTH",true),osg::StateAttribute::OVERRIDE);
root->addChild(normalAndDepthCamera.get());
}
// set hud to render synthetic texture
{
osg::ref_ptr<osg::Geode> geode = new osg::Geode;
osg::ref_ptr<osg::Geometry> geom =
osg::createTexturedQuadGeometry(osg::Vec3(0,0,0),osg::Vec3(windowWidth,0.0,0
.0),osg::Vec3(0.0,windowHeight,0.0));
geom->getOrCreateStateSet()->setMode(GL_LIGHTING,osg::StateAttribute::OFF);
geode->addDrawable(geom.get());
osg::ref_ptr<osg::Camera> viewCamera = new osg::Camera;
viewCamera->setName("ViewCamera");
viewCamera->setClearColor(clearColor);
viewCamera->setProjectionMatrix(osg::Matrix::ortho2D(0,windowWidth,0,windowH
eight));
viewCamera->setReferenceFrame(osg::Transform::ABSOLUTE_RF);
viewCamera->setViewMatrix(osg::Matrix::identity());
viewCamera->setViewport(0,0,windowWidth,windowHeight);
viewCamera->setRenderOrder(osg::Camera::POST_RENDER);
viewCamera->addChild(geode.get());
osg::ref_ptr<osg::StateSet> viewstateset =
viewCamera->getOrCreateStateSet();
osg::ref_ptr<osg::Program> program = new osg::Program;
program->addShader(Shaders::Instance()->getSilhouetteFragmentShader());
viewstateset->setAttributeAndModes(program.get(),osg::StateAttribute::ON);
viewstateset->setTextureAttributeAndModes(0,colorTexture.get(),osg::StateAtt
ribute::ON);
viewstateset->setTextureAttributeAndModes(1,normalAndDepthTexture.get(),osg:
:StateAttribute::ON);
viewstateset->addUniform(new
osg::Uniform("colorTexture",0));
viewstateset->addUniform(new
osg::Uniform("normalAndDepthTexture",1));
viewstateset->addUniform(new
osg::Uniform("windowWidth",(int)windowWidth));
viewstateset->addUniform(new
osg::Uniform("windowHeight",(int)windowHeight));
viewstateset->addUniform(new
osg::Uniform("SILHOUETTEONLY",false));
viewstateset->addUniform(new osg::Uniform("DepthThreshold",
(float)0.5));
viewstateset->addUniform(new osg::Uniform("NormalThreshold",
(float)0.5));
viewstateset->addUniform(new
osg::Uniform("DEPTHONLY",false));
viewstateset->addUniform(new
osg::Uniform("NORMALONLY",false));
viewstateset->addUniform(new
osg::Uniform("DEPTHANDNORMAL",true));
viewstateset->addUniform(new
osg::Uniform("silhouettecolor",osg::Vec4f(0.0f,0.0f,0.0f,1.0f)));
viewstateset->addUniform(new
osg::Uniform("backgroundcolor",clearColor));
root->addChild(viewCamera.get());
}
/***************************************************************************
***********************************/
-----Original Message-----
From: [EMAIL PROTECTED]
[mailto:[EMAIL PROTECTED] On Behalf Of Marcus Fritzen
Sent: Wednesday, July 18, 2007 3:20 PM
To: osg users
Subject: Re: [osg-users] multipass rendering
Hi Shuxing Xiao,
I have a similar problem, perhaps you can help me. I have a prerender
camera with a texture attached and make computations on it with a
fragment shader. Now I want to use the output of the shader as the input
of another shader. I am not really sure how I can do this. Do I need
another Camera or what? It would be usefull to me if you could explain
me how you did it.
Thank,
Marcus
Shuxing Xiao schrieb:
> I used to implement the silhouette calculating by multipass rendering.
>
> I calculated the rendering image and the normal and depth buffer in some
pre
> render camera, respectively, and save them in some textures, which are the
> inputs of the post render camera.(all of these three cameras are rendered
by
> GLSL shader.)
>
> I don't know what exact problem you have encountered, but if you want to
> discuss, feel free.
>
>
> -----Original Message-----
> From: [EMAIL PROTECTED]
> [mailto:[EMAIL PROTECTED] On Behalf Of Andreas
Hollmann
> Sent: Monday, July 16, 2007 10:21 PM
> To: osg-users@openscenegraph.net
> Subject: [osg-users] multipass rendering
>
> I need to implement post process effect.
>
> I have to change the color of rendered picture depending on the depth
> buffer. So I wrote shader for my post process, but as input it needs the
> rendered image and depth buffer.
>
> Is there some another technique to render post process as differing
shading?
>
> I looked at osg prereder and reflection examples, but I do not have real
> strategy. :-(
>
> Help!!!
> _____________________________________________________________________
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--
----------------------------------------------------------------
Marcus Fritzen E-mail: [EMAIL PROTECTED]
University Koblenz
Triererstr. 105, 56072 Koblenz,
HIWI FB4 Herr Jackel
----------------------------------------------------------------
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