Re: [osg-users] render depth buffer to image for one time
Sergey, thank you so much for your help. Its been very useful and has helped me focus my attention on the right things. I have almost finished what I needed to do. I have one last question: I now have an RTT camera which I take its depth and color attachments from. The RTT camera is a slave to the master scene camera and takes its data from there also. My problem is that when I just leave the natural settings of the master camera then it seems that the depth range changes according to the bounding box of the scene data. [Image: http://forum.openscenegraph.org/files/capture2_125.png ] The range in the above image it gives me is great but I dont want it to change. I want to fix that depth range and also be in control of it. In the next image I have set viewer.getCamera()-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR); I assumed this had to do with the near and far culling planes but it seems to affect the depth range also. [Image: http://forum.openscenegraph.org/files/capture1_105.png ] So now my question is how do I set and fix the depth range to what I choose? ... Thank you! Cheers, aaron[img][/img] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41117#41117 Attachments: http://forum.openscenegraph.org//files/capture1_105.png http://forum.openscenegraph.org//files/capture2_125.png ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
I was being silly. I simply didnt pick the right values for the near and far planes. This was my solution: Code: viewer.getCamera()-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR); double left,right,bottom,top,fovy,aspectratio,near,far; viewer.getCamera()-getProjectionMatrixAsPerspective(fovy,aspectratio,near,far); viewer.getCamera()-setProjectionMatrixAsPerspective(fovy,aspectratio,20,25); ... Thank you! Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41118#41118 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi Sergey I would like to understand exactly how the graphics pipeline works and am struggling to figure this out by digging through the code (are there free books that deal with OSG and its implementation details in-depth? I dont mean the QSG by Paul Martz...). Also, my understanding of OpenGL is lacking in some places especially in implementation details so perhaps this will help clear things up for me. In the prerender example we have something like this: 0: camera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); 1: camera-attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0), image); 2: camera-setPostDrawCallback(new MyCameraPostDrawCallback(image)); 3: textureRect[tex_to_get]-setImage(0, image); As far as I understand this works as follows 0: This generates an FBO which has no data storage until I attach data storage to it (next step) ? Is this true? What happens then when I attach a color attachment but dont attach a depth buffer attachment? Does OSG automatically generate one for me? I ask because in regular OpenGL when you dont attach a depth attachment to an FBO then rendering to the FBO using glEnable(GL_DEPTH_TEST) produces incorrect results... 1: The image attached to the camera is the data storage for the FBO created in step 0. If this is the case then it means the FBO sits in RAM and not on the GPU. Is that true? 2:Here we set a post render callback using the image as our input. As far as I understand this means that the image (which is sitting in RAM) is edited in place. That means that as long as we dont need the data for actual rendering then we are being efficient because we dont copy to the GPU. Which brings up the next line... 3: We specify that a texture has the image as its image. I dont entirely understand what this means. When we create the original texture then OpenGL allocates space on the GPU for that texture. By using setImage(0,image) then does that mean that whatever is in that image (which sits on RAM) must always be copied to the GPU texture before the texture can be used at render time? All in all I feel quite confused and would like to understand how to do the above process efficiently. Ideally I would like to : pass dynamic geometry to the GPU every frame and have that rendered to textures inside the GPU. Occassionally I would like to ask the GPU to send the RTT textures back to the CPU, update them on the CPU and then send them back to the GPU. How should I be doing that in the most efficient way possible? Thank you! Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41103#41103 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi aaron 0: osg can manage missing attachments for you if they are needed. This behaviour is configurable with env variables and in code. I dont actually remember default behaviour, but i think it will attach color and\or depth renderbuffers if they needed and missing, not sure about stencil. 1: as far as i remember this works by creating renderbuffer and then using glReadPixels from fbo to ram (image data storage). You can use image with pbo to make use of asynchronous dma transfers. Render to texture works faster, but you dont get your data on cpu side. 2: cant say much because didnt looked at example sources 3: texture-setImage(...) works like initializing gl texture with data stored in osg image with glTexImage(...), it will be copied in gpu memory and updated by osg if image changes. In this step you could also benefit from using image with pbo to get asynchronous copy. How should I be doing that in the most efficient way possible? Depends on data size, frequency of gpu-ram transfers and image processing speed on cpu. If you can process your image on gpu i'd stick with that and skip cpu processing altogether. Transfers gpu-ram not so fast in any case, though pbo usage can help hide latency. Cheers, Sergey. 01.07.2011, 19:49, aaron wetzler aaronwetz...@gmail.com: Hi Sergey I would like to understand exactly how the graphics pipeline works and am struggling to figure this out by digging through the code (are there free books that deal with OSG and its implementation details in-depth? I dont mean the QSG by Paul Martz...). Also, my understanding of OpenGL is lacking in some places especially in implementation details so perhaps this will help clear things up for me. In the prerender example we have something like this: 0: camera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); 1: camera-attach(osg::Camera::BufferComponent(osg::Camera::COLOR_BUFFER0), image); 2: camera-setPostDrawCallback(new MyCameraPostDrawCallback(image)); 3: textureRect[tex_to_get]-setImage(0, image); As far as I understand this works as follows 0: This generates an FBO which has no data storage until I attach data storage to it (next step) ? Is this true? What happens then when I attach a color attachment but dont attach a depth buffer attachment? Does OSG automatically generate one for me? I ask because in regular OpenGL when you dont attach a depth attachment to an FBO then rendering to the FBO using glEnable(GL_DEPTH_TEST) produces incorrect results... 1: The image attached to the camera is the data storage for the FBO created in step 0. If this is the case then it means the FBO sits in RAM and not on the GPU. Is that true? 2:Here we set a post render callback using the image as our input. As far as I understand this means that the image (which is sitting in RAM) is edited in place. That means that as long as we dont need the data for actual rendering then we are being efficient because we dont copy to the GPU. Which brings up the next line... 3: We specify that a texture has the image as its image. I dont entirely understand what this means. When we create the original texture then OpenGL allocates space on the GPU for that texture. By using setImage(0,image) then does that mean that whatever is in that image (which sits on RAM) must always be copied to the GPU texture before the texture can be used at render time? All in all I feel quite confused and would like to understand how to do the above process efficiently. Ideally I would like to : pass dynamic geometry to the GPU every frame and have that rendered to textures inside the GPU. Occassionally I would like to ask the GPU to send the RTT textures back to the CPU, update them on the CPU and then send them back to the GPU. How should I be doing that in the most efficient way possible? Thank you! Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=41103#41103 ___ 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] render depth buffer to image for one time
SOLUTION For anyone who struggled with this here is my solution. I really have no idea how correct it is but it works for me Code: //Setup of the viewer and scenedata here osg::ref_ptrosg::Camera osgCam = viewer.getCamera(); osg::ref_ptrosg::Image colorImage= new osg::Image; osg::ref_ptrosg::Image zImage = new osg::Image; colorImage-allocateImage(1024, 768, 1, GL_RGBA, GL_UNSIGNED_BYTE); zImage-allocateImage(1024, 768, 1, GL_DEPTH_COMPONENT , GL_UNSIGNED_BYTE); osgCam-attach(osg::Camera::COLOR_BUFFER, colorImage.get()); osgCam-attach(osg::Camera::DEPTH_BUFFER, zImage.get()); /* */ viewer.frame(); Sleep(100); osgDB::writeImageFile(*colorImage.get(),color.bmp); osgDB::writeImageFile(*zImage.get(),depth.bmp); Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40935#40935 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi, Aaron If you set singlethreaded mode and stop threading on viewer you can skip Sleep() step. Used same thing couple of times :) Cheers, Sergey. 27.06.2011, 20:11, aaron wetzler aaronwetz...@gmail.com: SOLUTION For anyone who struggled with this here is my solution. I really have no idea how correct it is but it works for me Code: //Setup of the viewer and scenedata here osg::ref_ptrosg::Camera osgCam = viewer.getCamera(); osg::ref_ptrosg::Image colorImage= new osg::Image; osg::ref_ptrosg::Image zImage = new osg::Image; colorImage-allocateImage(1024, 768, 1, GL_RGBA, GL_UNSIGNED_BYTE); zImage-allocateImage(1024, 768, 1, GL_DEPTH_COMPONENT , GL_UNSIGNED_BYTE); osgCam-attach(osg::Camera::COLOR_BUFFER, colorImage.get()); osgCam-attach(osg::Camera::DEPTH_BUFFER, zImage.get()); /* */ viewer.frame(); Sleep(100); osgDB::writeImageFile(*colorImage.get(),color.bmp); osgDB::writeImageFile(*zImage.get(),depth.bmp); Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40935#40935 ___ 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] render depth buffer to image for one time
Hi Aaron, Is there any reason why an osg::Camera FinalDrawCallback wouldn't work fine for handling the writes when required? This would work fine for multi-threaded usage and any length of time the the rendering would take. Robert. On Mon, Jun 27, 2011 at 5:11 PM, aaron wetzler aaronwetz...@gmail.com wrote: SOLUTION For anyone who struggled with this here is my solution. I really have no idea how correct it is but it works for me Code: //Setup of the viewer and scenedata here osg::ref_ptrosg::Camera osgCam = viewer.getCamera(); osg::ref_ptrosg::Image colorImage= new osg::Image; osg::ref_ptrosg::Image zImage = new osg::Image; colorImage-allocateImage(1024, 768, 1, GL_RGBA, GL_UNSIGNED_BYTE); zImage-allocateImage(1024, 768, 1, GL_DEPTH_COMPONENT , GL_UNSIGNED_BYTE); osgCam-attach(osg::Camera::COLOR_BUFFER, colorImage.get()); osgCam-attach(osg::Camera::DEPTH_BUFFER, zImage.get()); /* */ viewer.frame(); Sleep(100); osgDB::writeImageFile(*colorImage.get(),color.bmp); osgDB::writeImageFile(*zImage.get(),depth.bmp); Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40935#40935 ___ 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] render depth buffer to image for one time
Thanks hybr and robertosfield for your comments. Both useful and I will use those tips. Although my solution does work its not enough and Im now stuck on a couple of things. If you could point me in the right direction or to the right links that would be great 1)How do I render the depth image to the screen instead of rendering the color buffer? Whats the name of the function that lets me define which buffer I want rendered to the screen (or FBO for that matter) 2) I actually want to invert my depth image and edit its values. How do I do that before writing the image? 3) The dimensions I put in the allocateImage call i.e. (1024, 768) have no effect on the size of the written image. How can I change that? Looking forward to hearing from you Aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40958#40958 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi, Aaron. 1) You can render scene depth to texture(using additional camera), then render screen aligned quad with this texture on screen. Or you can use osgPPU nodekit to do this, in this case you will need to make pipeline of two units: UnitDepthBufferBypass and UnitOut (iirc) 2) You have two options: first you can work with raw data in your image before writing (there are interfaces to pointer to raw data), second - you can preprocess it with shaders (again, using osgPPU (add one UnitInOut with correct shader between two mentioned earlier) or add shader that will process data when drawing screen aligned quad mentioned earlier) 3) iirc image will resize if it is not large enough to capture entire window(with framebuffer rendering) or viewport (with fbo rendering) so you may need to setup your window correctly or create camera that render to fbo with correct dimensions and use it for image capture. Cheers, Sergey. 28.06.2011, 01:55, aaron wetzler aaronwetz...@gmail.com: Thanks hybr and robertosfield for your comments. Both useful and I will use those tips. Although my solution does work its not enough and Im now stuck on a couple of things. If you could point me in the right direction or to the right links that would be great 1)How do I render the depth image to the screen instead of rendering the color buffer? Whats the name of the function that lets me define which buffer I want rendered to the screen (or FBO for that matter) 2) I actually want to invert my depth image and edit its values. How do I do that before writing the image? 3) The dimensions I put in the allocateImage call i.e. (1024, 768) have no effect on the size of the written image. How can I change that? Looking forward to hearing from you Aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40958#40958 ___ 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] render depth buffer to image for one time
Alright, for whom it may concerns, it's all in the GraphicsContext especially in the pixel buffer. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12367#12367 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi, Please excuse all my spam... I tried the almost same code than mister Jojo. I tried 2 instances: -One using a created camera diffrent from the viewer's one. -The other using the viewer's camera. In the first case, I can grab the color image, but the camera isn't oriented at all as I tell it to (bad bad camera). In the second case I got nothing. Thus, I guess the only solution is using the viewer, isn't it? If you have nice documentation about the viewer, please, let me know! Thank you! Cheers, Maxime -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12388#12388 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi! jojo wrote: As I understand, the command camera-attach(osg::Camera::COLOR_BUFFER, depth.get(),0,0); tells osg, that I want the color buffer of the camera to be stored in the image depth. This works, but when I change it to camera-attach(osg::Camera::DEPTH_BUFFER, depth.get(),0,0); I get the same result. A colored picture. Regards, jojo I've read your post with great interest! I work with the COLOR_BUFFER (for now...) and I've a question for you. I tried to reproduce your code in mine (thus I don't exactly do the same things) and it seems my _depth image (that I use to store colors...) is initialized at allocationImage but the buffer data is never refreshed. I tried: Code: _depth-allocateImage(vec-x(), vec-y(), 1, GL_COLOR, GL_INT); and Code: _depth-allocateImage(vec-x(), vec-y(), 1, GL_RGBA, GL_INT); Is there any instruction to do that that I skiped? Thanks! Max -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12203#12203 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi Max, I think you should use _depth-allocateImage(vec-x(), vec-y(), 1, GL_RGBA, GL_UNSIGNED_BYTE); instead of GL_INT because the color buffer of your graphics card has 8 bit per color channel. Regards, jojo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12205#12205 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Thanks. I tried but it does'nt change the results. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12208#12208 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi, I think you should use GL_LUMINANCE instead of GL_RGBA too. Best regards Raymond Johannes Leidheiser wrote: Hi Max, I think you should use _depth-allocateImage(vec-x(), vec-y(), 1, GL_RGBA, GL_UNSIGNED_BYTE); instead of GL_INT because the color buffer of your graphics card has 8 bit per color channel. Regards, jojo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12205#12205 ___ 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] render depth buffer to image for one time
GL_LUMINANCE is for gray scale images. For example if you want to save the depth buffer. Besides you should post a little bit more code. I don't know how much experience your have with open scene graph. Maybe you didn't call the frame() method of your viewer, the camera is not attached to a node or maybe there is just nothing to see in the viewing frustum? Did you display the camera normaly which means with turned off offscreen rendering? Regards, Johannes -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12216#12216 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi Johannes, Uhm, it's a little confusing who you are addressing with 'you'. You do that twice and I think you mean 2 different people... Anyway, I was trying to help in another direction. I have indeed used GL_LUMINANCE for grabbing depth images. I guess I was mislead somehow by the subject of the message, as well as the lack of context because the history is not in the messages. good luck Raymond Johannes Leidheiser wrote: GL_LUMINANCE is for gray scale images. For example if you want to save the depth buffer. Besides you should post a little bit more code. I don't know how much experience your have with open scene graph. Maybe you didn't call the frame() method of your viewer, the camera is not attached to a node or maybe there is just nothing to see in the viewing frustum? Did you display the camera normaly which means with turned off offscreen rendering? Regards, Johannes -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12216#12216 ___ 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] render depth buffer to image for one time
jojo wrote:
GL_LUMINANCE is for gray scale images. For example if you want to save the
depth buffer.
Ok, thus, I should use GL_RGBA.
jojo wrote:
Besides you should post a little bit more code. I don't know how much
experience your have with open scene graph. Maybe you didn't call the frame()
method of your viewer, the camera is not attached to a node or maybe there is
just nothing to see in the viewing frustum?
My camera is attached to the root of the scene graph.
I retrieve the image during the rendering loop (it's true I didn't do it at
first...), thus after 5 viewer.frame ('cause I setted it at 5).
There is something to see from my camera.
jojo wrote:
Did you display the camera normaly which means with turned off offscreen
rendering?
However, I don't know what you mean here, it seems to be a key point...
I've read things about pre-render, but you don't do any, right?
Here's a bit of my code:
I create the camera:
Code:
ref_ptrCamera MyPTMutils::createCamera(Matrix cameraIntrinsic, Matrix
cameraPosition)
{
// parameters for MyPTM
double width = cameraIntrinsic(0, 2)*2;
double height = cameraIntrinsic(1, 2)*2;
double fy = cameraIntrinsic(1, 1);
// create camera for MyPTM
ref_ptrCamera new_camera = new Camera();
new_camera-setComputeNearFarMode(osg::CullSettings::DO_NOT_COMPUTE_NEAR_FAR);
new_camera-setViewport(0, 0, width, height);
new_camera-setProjectionMatrixAsPerspective((360./PI)*atan(height/(2*fy)) ,
(double)width/height, 1.0, 1000.0);
new_camera-setViewMatrix(Matrix::inverse(cameraPosition));
return (new_camera);
}
I modify the camera (I know this can seem strange out of the context):
Code:
MyPTM::MyPTM(Geode* _arg_geode, std::string imgpath , int _arg_textureUnit,
float focal, Quat rotation, Vec3d position)
{
ref_ptrosg::Image img = osgDB::readImageFile(imgpath);
cu = img-s();
cv = img-t();
Vec2f *vec = new Vec2f(cu,cv);
MyPTMutils::setClosestPowerOfTwo(vec);
...
_camera = MyPTMutils::createCamera(cameraIntrinsic, transform);
_texture = new Texture2D(osgDB::readImageFile(imgpath));
_camera-setReferenceFrame(Transform::ABSOLUTE_RF);
_camera-setDataVariance(Object::DYNAMIC);
_depth = new Image();
_depth-allocateImage(vec-x(), vec-y(), 1, GL_RGBA, GL_UNSIGNED_BYTE);
_camera-attach(osg::Camera::COLOR_BUFFER, _depth.get(),0,0);
And the print:
Code:
float* bl = (float*)(_depth-data());
osgDB::writeImageFile(*_depth.get(),depth.png);
This makes me think: why a float* ?
And the main
Code:
MyPTM* myptm2 = new MyPTM((Geode*) (root-getChild(2)),
../Media/Data_Calibrage/Image/IMG_5316_small.jpg, 0, 720.0, r, camposition);
myptm2-_camera-setView(viewer);
viewer.addSlave(myptm2-_camera.get());
viewer.setSceneData( root.get());
viewer.realize();
int once = 0;
while( !viewer.done() )
{
viewer.frame();
if (once == 50)
myptm2-printDepthImage();
once++;
}
--
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http://forum.openscenegraph.org/viewtopic.php?p=12271#12271
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Re: [osg-users] render depth buffer to image for one time
I forgot: thanks for everything! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12272#12272 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
As I understand, the command camera-attach(osg::Camera::COLOR_BUFFER, depth.get(),0,0); tells osg, that I want the color buffer of the camera to be stored in the image depth. This works, but when I change it to camera-attach(osg::Camera::DEPTH_BUFFER, depth.get(),0,0); I get the same result. A colored picture. Regards, jojo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11173#11173 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
Hi, I tried to fix it a few more times, but I can't. It's working for color but not for the depth buffer. When I execute the following code I get the variables texture2D and depth filled with white color. I draw the image and the texture on a rectangle. Thanks for help, jojo Code: osgViewer::Viewer* v = new osgViewer::Viewer; v-setCameraManipulator(new osgGA::TrackballManipulator()); v-getCameraManipulator()-setHomePosition(getCameraPosition2(), getLookAtPoint(), getUpVector()); osg::ref_ptrosg::GraphicsContext::Traits traits = new osg::GraphicsContext::Traits; traits-target = osg::Camera::FRAME_BUFFER_OBJECT; traits-x =0; traits-y = 0; traits-width = 720; traits-height = 576; traits-windowDecoration = false; traits-doubleBuffer = false; traits-sharedContext = 0; traits-pbuffer = true; osg::GraphicsContext* _gc= osg::GraphicsContext::createGraphicsContext(traits.get()); v-getCamera()-setGraphicsContext(_gc); osg::Camera* camera = v-getCamera(); camera-setViewport(new osg::Viewport(0,0,720,576)); double fovy, aspectRatio, zNear, zFar; camera-getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar); std::cout fovy aspectRatiozNear zFar\n; fovy+=41.0; camera-setProjectionMatrixAsPerspective(fovy, aspectRatio, zNear, zFar); std::cout fovy aspectRatiozNear zFar\n; v-setSceneData(osgDB::readNodeFile(Scene1.osg)); v-setDataVariance(osg::Object::DYNAMIC); v-setThreadingModel(osgViewer::Viewer::SingleThreaded); v-realize(); osg::ref_ptrosg::Image depth = new osg::Image; osg::ref_ptrosg::Image color = new osg::Image; color-allocateImage(720, 576, 1, GL_RGBA, GL_UNSIGNED_BYTE); depth-allocateImage(720, 576, 1, GL_DEPTH_COMPONENT, GL_FLOAT); camera-attach(osg::Camera::COLOR_BUFFER, color.get()); camera-attach(osg::Camera::DEPTH_BUFFER, depth.get()); osg::ref_ptrosg::Texture2D texture2D = new osg::Texture2D; texture2D-setTextureSize(720, 576); texture2D-setInternalFormat(GL_DEPTH_COMPONENT); texture2D-setFilter(osg::Texture2D::MIN_FILTER,osg::Texture2D::LINEAR); texture2D-setFilter(osg::Texture2D::MAG_FILTER,osg::Texture2D::LINEAR); camera-attach(osg::Camera::DEPTH_BUFFER, texture2D.get(), 0, 0, false); //camera-attach(osg::Camera::DEPTH_BUFFER, depth.get(),0,0); v-frame(); -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11207#11207 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
depthReadP-readPixels(0,0,719,575, GL_RGB ,GL_UNSIGNED_BYTE);
Shouldn't the type be GL_DEPTH instead of GL_RGB? I think you can find this
info under glReadPixels in the OpenGL blue book.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com
+1 303 859 9466
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Johannes
Leidheiser
Sent: Thursday, April 30, 2009 2:38 PM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] render depth buffer to image for one time
Hi,
for my current project I need to render the depth buffer of a scene off
screen into a texture or an image. During the last few days I tried to solve
it but I couldn't get a good result. I got it work to render the color
buffer into an image, but I need the depth buffer. In the following code I
tried different ways to solve the problem, so it's a little bit mixed. Maybe
somebody can give me a hint? I think I'm not far away from the solution.
Thank you in advance,
Jojo
Code:
osg::Image* renderToImage()
{
osgViewer::Viewer* v = new osgViewer::Viewer;
v-setCameraManipulator(new osgGA::TrackballManipulator());
v-getCameraManipulator()-setHomePosition(getCameraPosition2(),
getLookAtPoint(), getUpVector());
osg::ref_ptrosg::GraphicsContext::Traits traits = new
osg::GraphicsContext::Traits;
traits-x =0;
traits-y = 0;
traits-width = 720;
traits-height = 576;
traits-windowDecoration = false;
traits-doubleBuffer = false;
traits-sharedContext = 0;
traits-pbuffer = true;
osg::GraphicsContext* _gc=
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::Camera* camera = v-getCamera();
camera-setGraphicsContext(_gc);
camera-setViewport(new osg::Viewport(0,0,720,576));
double fovy, aspectRatio, zNear, zFar;
camera-getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear,
zFar);
std::cout fovy aspectRatiozNear
zFar\n;
fovy+=41.0;
camera-setProjectionMatrixAsPerspective(fovy, aspectRatio, zNear,
zFar);
std::cout fovy aspectRatiozNear
zFar\n;
//camera-setViewMatrixAsLookAt(getCameraPosition2(),
getLookAtPoint(), getUpVector());
v-setSceneData(osgDB::readNodeFile(Scene1.osg));
v-setDataVariance(osg::Object::DYNAMIC);
v-setThreadingModel(osgViewer::Viewer::SingleThreaded);
v-realize();
osg::ref_ptrosg::Image depth = new osg::Image;
//depth-allocateImage(720, 576, 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
camera-attach(osg::Camera::DEPTH_BUFFER, depth.get(),0,0);
v-frame();
float* bl =(float*)depth-data();
for(int i=0; i 1; i++)
std::cout Depth: bl[i]\n;
osgDB::writeImageFile(*depth.get(),depth.png);
osg::ref_ptrosg::Image depthReadP = new osg::Image;
depthReadP-readPixels(0,0,719,575, GL_RGB ,GL_UNSIGNED_BYTE);
osgDB::writeImageFile(*depthReadP.get(),depthReadP.png);
delete v;
osg::notify(osg::NOTICE)Successstd::endl;
return new osg::Image();
}
[/code]
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Re: [osg-users] render depth buffer to image for one time
In my previous post, that should be GL_DEPTH_COMPONENT, sorry.
Paul Martz
Skew Matrix Software LLC
http://www.skew-matrix.com
+1 303 859 9466
-Original Message-
From: osg-users-boun...@lists.openscenegraph.org
[mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Johannes
Leidheiser
Sent: Thursday, April 30, 2009 2:38 PM
To: osg-users@lists.openscenegraph.org
Subject: [osg-users] render depth buffer to image for one time
Hi,
for my current project I need to render the depth buffer of a scene off
screen into a texture or an image. During the last few days I tried to solve
it but I couldn't get a good result. I got it work to render the color
buffer into an image, but I need the depth buffer. In the following code I
tried different ways to solve the problem, so it's a little bit mixed. Maybe
somebody can give me a hint? I think I'm not far away from the solution.
Thank you in advance,
Jojo
Code:
osg::Image* renderToImage()
{
osgViewer::Viewer* v = new osgViewer::Viewer;
v-setCameraManipulator(new osgGA::TrackballManipulator());
v-getCameraManipulator()-setHomePosition(getCameraPosition2(),
getLookAtPoint(), getUpVector());
osg::ref_ptrosg::GraphicsContext::Traits traits = new
osg::GraphicsContext::Traits;
traits-x =0;
traits-y = 0;
traits-width = 720;
traits-height = 576;
traits-windowDecoration = false;
traits-doubleBuffer = false;
traits-sharedContext = 0;
traits-pbuffer = true;
osg::GraphicsContext* _gc=
osg::GraphicsContext::createGraphicsContext(traits.get());
osg::Camera* camera = v-getCamera();
camera-setGraphicsContext(_gc);
camera-setViewport(new osg::Viewport(0,0,720,576));
double fovy, aspectRatio, zNear, zFar;
camera-getProjectionMatrixAsPerspective(fovy, aspectRatio, zNear,
zFar);
std::cout fovy aspectRatiozNear
zFar\n;
fovy+=41.0;
camera-setProjectionMatrixAsPerspective(fovy, aspectRatio, zNear,
zFar);
std::cout fovy aspectRatiozNear
zFar\n;
//camera-setViewMatrixAsLookAt(getCameraPosition2(),
getLookAtPoint(), getUpVector());
v-setSceneData(osgDB::readNodeFile(Scene1.osg));
v-setDataVariance(osg::Object::DYNAMIC);
v-setThreadingModel(osgViewer::Viewer::SingleThreaded);
v-realize();
osg::ref_ptrosg::Image depth = new osg::Image;
//depth-allocateImage(720, 576, 1, GL_LUMINANCE, GL_UNSIGNED_BYTE);
camera-attach(osg::Camera::DEPTH_BUFFER, depth.get(),0,0);
v-frame();
float* bl =(float*)depth-data();
for(int i=0; i 1; i++)
std::cout Depth: bl[i]\n;
osgDB::writeImageFile(*depth.get(),depth.png);
osg::ref_ptrosg::Image depthReadP = new osg::Image;
depthReadP-readPixels(0,0,719,575, GL_RGB ,GL_UNSIGNED_BYTE);
osgDB::writeImageFile(*depthReadP.get(),depthReadP.png);
delete v;
osg::notify(osg::NOTICE)Successstd::endl;
return new osg::Image();
}
[/code]
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Re: [osg-users] render depth buffer to image for one time
Hi Paul, you are right, I only used that for testing. But also with GL_DEPTH_COMPONENT it doesn't work. In my experience the readPixel command doesn't work for of screen rendering?! I would prefer the version with the variable depth which is attached to the camera. In my first post I forgot to say that I still use version 2.6 of osg. Regards, jojo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11149#11149 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] render depth buffer to image for one time
I'm not sure why the code you posted doesn't work. When I want to read the screen (color, depth, whatever), I use a post draw callback attached to the Camera. This should work whether your framebuffer is a window or an FBO. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -Original Message- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Johannes Leidheiser Sent: Thursday, April 30, 2009 3:30 PM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] render depth buffer to image for one time Hi Paul, you are right, I only used that for testing. But also with GL_DEPTH_COMPONENT it doesn't work. In my experience the readPixel command doesn't work for of screen rendering?! I would prefer the version with the variable depth which is attached to the camera. In my first post I forgot to say that I still use version 2.6 of osg. Regards, jojo -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=11149#11149 ___ 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
