[osg-users] Is OSG for iOS a good candidate for displaying PLY files?
Hi I have asked some students under my supervision to display PLY files that they have created and are stored on a server. The idea is they have built an app in iOS and then they connect to the server, download the PLY files and then display them on the iPhone\iPad. They have no experience with computer graphics of any sort so I figured I would look for a good solution and point them in the right direction. My question is this: Can OSG be used easily within an XCode project that they have already coded? Can OSG be used to read and display PLY files? ... Thank you! Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57766#57766 ___ 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
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
[osg-users] Displaying depth buffer
Hi, I would like to render the depth buffer of my scene instead of the color buffer. I would also like to be able to save the depth buffer and the colorbuffer to a file (i.e. bmp or jpg or whatever). How can I do this? Cheers, aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40922#40922 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] unable to save render-to-texture image
Hi loveRiceee Did you manage to get this working? Aaron loveRiceee wrote: Hi,all I was trying to save a render-to-texture image file many ways, however, failed each time. when i attach texture to camera.it works fine. but i attach image to camera. it doesn't work right. I saved the image data to .jpg, .png, .bmp format . but when i double-click the saved image file, there's nothing but blank.and when i tried do the same thing in the osg example osgprerender, the problem was still that. i use osgDB::writeImageFile(*image, d:\\data\\test.bmp); why? Is there someone met this problem? How did you fix it? Code: osg::ref_ptrosg::Texture2D colorMap = new osg::Texture2D; colorMap-setTextureSize(width, height); colorMap-setInternalFormat(GL_RGBA); colorMap-setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); colorMap-setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); osg::ref_ptrosg::Texture2D depthMap = new osg::Texture2D; depthMap-setTextureSize(width,height); depthMap-setInternalFormat(GL_DEPTH_COMPONENT); depthMap-setFilter(osg::Texture2D::MIN_FILTER, osg::Texture2D::LINEAR); depthMap-setFilter(osg::Texture2D::MAG_FILTER, osg::Texture2D::LINEAR); osg::ref_ptrosg::Camera camera = new osg::Camera; camera-setClearColor(osg::Vec4(1.0f, 1.0f, 1.0f, 1.0f)); camera-setClearMask(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT); camera-setReferenceFrame(osg::Transform::RELATIVE_RF); camera-setProjectionMatrixAsFrustum(-proj_right, proj_right, -proj_top, proj_top, znear, zfar); //camera-setReferenceFrame(osg::Transform::ABSOLUTE_RF); camera-setProjectionMatrix(osg::Matrixd::identity()); camera-setViewMatrixAsLookAt(bs.center()-osg::Vec3(0.0f,2.0f,0.0f)*bs.radius(),bs.center(),osg::Vec3(0.0f,0.0f,1.0f)); camera-setViewMatrix(osg::Matrixd::identity()); camera-setViewport(0, 0, width, height); camera-setRenderOrder(osg::Camera::PRE_RENDER); camera-setRenderTargetImplementation(osg::Camera::FRAME_BUFFER_OBJECT); camera-attach(osg::Camera::DEPTH_BUFFER, depthMap); camera-attach(osg::Camera::COLOR_BUFFER, colorMap); osg::ref_ptrosg::Image image = new osg::Image; image-allocateImage(width, height, 1, GL_RGBA, GL_FLOAT); image-setInternalTextureFormat(GL_RGBA); camera-attach(osg::Camera::COLOR_BUFFER, image.get()); osg::ref_ptrosg::Geode geo = createCube(colorMap, depthMap); camera-addChild(modelNode.get()); osg::ref_ptrosg::Group parent = new osg::Group; parent-addChild(geo.get()); parent-addChild(camera.get()); osgDB::writeImageFile(*image, test.bmp); //colorMap-setImage(0, image); return parent.get(); ... Thank you! Cheers, sun -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40925#40925 ___ 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
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] [osgPlugins] Export Blender to OSG
This is for anyone who is struggling to install osgExport on windows or mac for use with Blender. The configuration which currently works for me uses Blender 2.49 (thanks Cedric!) Windows 7 1)Download and install Blender 2.49 2)The scripts folder is in your hidden AppData folder. So on my PC that is found at C:\Users\Aaron\AppData\Roaming\Blender Foundation\Blender\.blender\scripts 3)Download https://bitbucket.org/cedricpinson/osgexport/get/tip.zip 4)Copy the folder blenderExporter to the directory in step 2 If you run blender you will now see you have OpenSceneGraph (.osg) as an export option. Mac OSX Snow Leopard 1)Download Blender 2.49 2)Drag the Blender executable to Applications or run it as is in its downloaded location 3)The folder we are looking for is in blender.app So on my Mac for example the script folder is here /Users/aw/Downloads/blender-2.49b-OSX-10.5-py2.5-intel/blender.app/Contents/MacOS/.blender/scripts If you have put it in Applications then the above will be /Applications/blender.app/Contents/MacOS/.blender/scripts 4)Download https://bitbucket.org/cedricpinson/osgexport/get/tip.zip 5)Copy the folder blenderExporter to the directory in step 3 If you run blender you will now see you have OpenSceneGraph (.osg) as an export option. A note on Blender 2.57 : I installed the script given by damyon here- http://forum.openscenegraph.org/viewtopic.php?p=39897#39897 but unfortunately it doesnt work with armatures and a number of other test files I tried so until that happens 2.57 isnt a viable option. However if at some point it is fixed then one should note that currently the install location is slightly different. This might change again but basically instead of copying the folder blenderExporter to the scripts folder you need to copy the contents of the folder blenderExporter to the scripts/addons folder and then enable the script under User Preferences -Add-ons -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=40070#40070 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Export Blender to OSG
Hi Alberto You are right. I found the osgExport and osgAnimation. Im currently really stuck on the osgExport though and would really like to be able to find a version of blender and a version of osgExport that work together. Do you have any experience with this? Do you know which versions of both I could download for windows 7 that will work? Thanks Aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=39940#39940 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgexport for blender?
damyon wrote: Hi Alberto, Here is an updated script that should fix this crash. Cheers, Damyon Hi Damyon I have been struggling to install the exporter. Could you tell me what the steps are for using the file you have attached above are in Blender 2.57 on Windows 7? The steps I took : 1)Downloaded osgexport-no-mercurial-20100527_r6.tar.gz 2)Unzipped it onto my desktop. 3)Went into Blender, User Preferences -Add-ons and clicked Install Add-on. Then in the file selection screen I found the osgExport.py file on my desktop and clicked install Add-on 4)A new line appears with the running figure and a grey checkbox with the description Import-Export: Export OSG format (.osg) 5)I tried clicking on the checkbox but it doesnt activate. What should I do? Also, I thought I should have a folder called /.blender/scripts in my blender folder but I dont have anything there. The only folder I have is 2.57 Im really stuck and its really important for me because I need to export a hand armature that has been skinned in Blender into OSG for some research we are trying to do. Any help will be appreciated! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=39897#39897 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] Export Blender to OSG
Hi, I have the following task to do: 1. Import a mesh of a hand (.obj) into blender. Create an armature in Blender 2. Skin the armature with the hand mesh. 3. Export this armature and mesh into OSG. 4. Alter the armature poses in OSG and output a set of jpgs or bmps of the depth maps of the resulting poses. I have done 1 and 2 but dont know how to do 3 and 4. What format can I output from Blender that OSG will be able to understand? What part of OSG should I be using? OSGAnimation? I imagine step 3 is totally standard so thats the most critical part for me because I have no idea how to go about it. I am a relative newbie to the world of meshes and animation and would really appreciate some help because I have been stuck on this for two weeks and I cant do it by myself. Thanks! Looking forward to hearing from the forum :) Aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=39877#39877 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] osgexport for blender?
Hi Damyon Thanks for your reply. I didnt manage on windows so Im now trying on Mac OSX. I did as you suggested and copied the folder osg and the file osgExport.py into /Applications/blender.app/contents/MacOS/2.57/scripts/addons and once again the line for the osgExporter appears inside blender. However, when I try to click on the checkbox to enable it it doesnt change. it doesnt respond at all. I restarted Blender but that didnt help. Am I missing a step? Do I have to do something else? Thanks Aaron -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=39904#39904 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
