Re: [osg-users] How to getting the number of vertices
Hi Kim, Have a look at the osgUtil::StatsVisitor, you'll find it in the include/osgUtil/Statistics header. Robert. On 2 December 2013 06:49, Kim JongBum osgfo...@tevs.eu wrote: Hi, i would like to know the number of vertices in the scene. i know how to see the value of vertices as i press 's'button. but i wanna know how can i get the value (ex_for storing into variable) Thank you! Cheers, Kim -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57508#57508 ___ 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] [osgOcean] Regulate the Ocean Reflection intensity.
Hi, Nice, I've seen now the mod, I'll try them as soon Thank you! Cheers, Dario -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57512#57512 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgOcean] Regulate the Ocean Reflection intensity.
Hi, Looking the patch, I've seen that this is the same mod that I've tried but doesn't looks good to me...I'm using the trunk version, so the patch is different because some stuffs are moved in Technique file, but the mod is the same and I'm not really able to tone down (mean: add a lower reflection intensity) the reflection. Playing with fresnel mul and reflection mul don't move to me along a right final effect. Have you tried some other parameters combination? Have you a snapshot to see your result? Thank you! Cheers, Dario -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=57513#57513 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] rendering millions of spheres
Hi Community, I remember someone has faced this problem and I think with some solution. Anyone knowing some pointers willing to share some hints, techniques? Thanks a bunch Nick -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
Hi Nick, On 2 December 2013 13:49, Trajce Nikolov NICK trajce.nikolov.n...@gmail.com wrote: I remember someone has faced this problem and I think with some solution. Anyone knowing some pointers willing to share some hints, techniques? What approach you want to take depends upon what you want in terms of the visual, how close you plan to allow users to get the spheres, do you need them to be lit etc. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
In order to render a large amount of identical primitives, you probably want to use either instancing or geometry shaders. If your target hardware supports OpenGl 3.x features, then the latter is better. You can use arrays of per-vertex data to specify the differences between your spheres (radius, colour etc), create your osg::geometry as a list of points and have your geometry shader expand that into spheres. For the spheres themselves, it's far quicker to create them as camera-facing impostors, and have your fragment shader just draw spheres for each of them (various examples are available on the web), which can be lit as needs be. The trouble is that they will be flat, which might not be ideal if many of your spheres intersect. You could at least save some triangles by generating camera-facing hemispheres. I'm not sure what the effect would be if you changed the z-values in the fragment shader, but I am advised that's not a good idea, because it means z-buffer-testing can't be done before your fragment shader is run. If you're stuck with older or mobile hardware, then (extensions permitting) you can use shader instancing to do the same thing. Create a single sphere (or hemisphere or quad, for an impostor) , put your per-instance data into a texture, and sample that texture in your vertex shader (ensure you set your texture filtering modes appropriately). There is an example osgdrawinstanced supplied with the OpenSceneGraph distribution that shows you basically how that is done. If you don't have the instancing extension available (MESA software rendering, some older mobile OpenGLES 2 chipsets, VERY old desktop hardware) you need to just make sure you render them in large batches of vertices, which means making 1, or only a few Geometries containing multiple spheres (or quads if you can still use a vertex shader to orient them). Quite a lot of ideas there for things to try, I think, apologies if any of that is a bit confusing. Alistair Baxter Software Engineer Have you downloaded your FREE copy of FieldMove Clino? Find out more about our app for iPhone and Android smartphones: http://news.mve.com/fieldmoveclino Midland Valley Exploration Ltd. 144 West George Street Glasgow G2 2HG United Kingdom Tel: +44 (0) 141 332 2681 Fax:+44 (0) 141 332 6792 The structural geology experts From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Trajce Nikolov NICK Sent: 02 December 2013 13:50 To: OpenSceneGraph Users Subject: [osg-users] rendering millions of spheres Hi Community, I remember someone has faced this problem and I think with some solution. Anyone knowing some pointers willing to share some hints, techniques? Thanks a bunch Nick -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
Thanks Robert, and Alistair for the detailed info. I have done this in the past as you mentioned with geometry shaders by passing the centers and radiuses as vertex array and attribs and expanding them into spheres in a geometry shader. Can not use it now though. So your another hint was the sample from the osg repo. I will have a look at it. I have to model rain drops on wind shield, and not aligned to screen but in 3d. I have set of rain drop models from Modo and looking around for the best approach to get these models randomly placed in 3D on a geometry (the wind shield) as many as possible. Thanks a bunch again for the hints. Nick On Mon, Dec 2, 2013 at 5:44 PM, Alistair Baxter alist...@mve.com wrote: In order to render a large amount of identical primitives, you probably want to use either instancing or geometry shaders. If your target hardware supports OpenGl 3.x features, then the latter is better. You can use arrays of per-vertex data to specify the differences between your spheres (radius, colour etc), create your osg::geometry as a list of points and have your geometry shader expand that into spheres. For the spheres themselves, it’s far quicker to create them as camera-facing impostors, and have your fragment shader just draw spheres for each of them (various examples are available on the web), which can be lit as needs be. The trouble is that they will be flat, which might not be ideal if many of your spheres intersect. You could at least save some triangles by generating camera-facing hemispheres. I’m not sure what the effect would be if you changed the z-values in the fragment shader, but I am advised that’s not a good idea, because it means z-buffer-testing can’t be done before your fragment shader is run. If you’re stuck with older or mobile hardware, then (extensions permitting) you can use shader instancing to do the same thing. Create a single sphere (or hemisphere or quad, for an impostor) , put your per-instance data into a texture, and sample that texture in your vertex shader (ensure you set your texture filtering modes appropriately). There is an example osgdrawinstanced supplied with the OpenSceneGraph distribution that shows you basically how that is done. If you don’t have the instancing extension available (MESA software rendering, some older mobile OpenGLES 2 chipsets, VERY old desktop hardware) you need to just make sure you render them in large batches of vertices, which means making 1, or only a few Geometries containing multiple spheres (or quads if you can still use a vertex shader to orient them). Quite a lot of ideas there for things to try, I think, apologies if any of that is a bit confusing. Alistair Baxter Software Engineer Have you downloaded your FREE copy of *FieldMove Clino? *Find out more about our app for iPhone and Android smartphones: http://news.mve.com/fieldmoveclino Midland Valley Exploration Ltd. 144 West George Street Glasgow G2 2HG United Kingdom Tel: +44 (0) 141 332 2681 Fax:+44 (0) 141 332 6792 The structural geology experts *From:* osg-users-boun...@lists.openscenegraph.org [mailto: osg-users-boun...@lists.openscenegraph.org] *On Behalf Of *Trajce Nikolov NICK *Sent:* 02 December 2013 13:50 *To:* OpenSceneGraph Users *Subject:* [osg-users] rendering millions of spheres Hi Community, I remember someone has faced this problem and I think with some solution. Anyone knowing some pointers willing to share some hints, techniques? Thanks a bunch Nick -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
Hi Nick, On 2 December 2013 15:18, Trajce Nikolov NICK trajce.nikolov.n...@gmail.com wrote: I have to model rain drops on wind shield, and not aligned to screen but in 3d. I have set of rain drop models from Modo and looking around for the best approach to get these models randomly placed in 3D on a geometry (the wind shield) as many as possible. I wouldn't personally render rain drops with traditional geometry, rather I'd try and create quads that are textured and using pixel shaders that do motion blur and refraction effects that are required. On the wind shield rain drops are only briefly round and will quickly coalesce with other drops and then run across the screen with gravity and wind effects, here sphere's wouldn't appropriate at all. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
Hi Robert, you are right, and probably that is the best approach. How would you approach the coalescing of drops? I am aware of papers of properly doing it as well. However, I took the fastest approach :-) ... Tried that in Modo based on some modeling tutorial and now trying to mimic it into real-time. Don't care about the physic that much, and to make it accurate, just to make it as soon as possible with some good visual. In Modo it works in a way you model few drops and you morph them as they run across the screen, and also the models are fired on the screen with particle effect choosing random models and positions. This is what I am trying to mimic. The results visually are great, and I can agree with you it is not the best approach, but let see how far I get. At the moment I am worrying only about performance. So for the first run I am to learn about the techniques of instancing etc. that's why I have asked for the simple case of rendering spheres, At the end I am not going to have spheres but some other geometries, maybe even your suggested textured quads. also want to ask the community, specially those with advanced GLSL skills, if someone can rewrite the vertex program into GLSL example, please email me Nick On Mon, Dec 2, 2013 at 7:02 PM, Robert Osfield robert.osfi...@gmail.comwrote: Hi Nick, On 2 December 2013 15:18, Trajce Nikolov NICK trajce.nikolov.n...@gmail.com wrote: I have to model rain drops on wind shield, and not aligned to screen but in 3d. I have set of rain drop models from Modo and looking around for the best approach to get these models randomly placed in 3D on a geometry (the wind shield) as many as possible. I wouldn't personally render rain drops with traditional geometry, rather I'd try and create quads that are textured and using pixel shaders that do motion blur and refraction effects that are required. On the wind shield rain drops are only briefly round and will quickly coalesce with other drops and then run across the screen with gravity and wind effects, here sphere's wouldn't appropriate at all. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] rendering millions of spheres
the vertex program from osgvertexprogram sample ;-) .. forgot to mention Nick On Mon, Dec 2, 2013 at 7:21 PM, Trajce Nikolov NICK trajce.nikolov.n...@gmail.com wrote: Hi Robert, you are right, and probably that is the best approach. How would you approach the coalescing of drops? I am aware of papers of properly doing it as well. However, I took the fastest approach :-) ... Tried that in Modo based on some modeling tutorial and now trying to mimic it into real-time. Don't care about the physic that much, and to make it accurate, just to make it as soon as possible with some good visual. In Modo it works in a way you model few drops and you morph them as they run across the screen, and also the models are fired on the screen with particle effect choosing random models and positions. This is what I am trying to mimic. The results visually are great, and I can agree with you it is not the best approach, but let see how far I get. At the moment I am worrying only about performance. So for the first run I am to learn about the techniques of instancing etc. that's why I have asked for the simple case of rendering spheres, At the end I am not going to have spheres but some other geometries, maybe even your suggested textured quads. also want to ask the community, specially those with advanced GLSL skills, if someone can rewrite the vertex program into GLSL example, please email me Nick On Mon, Dec 2, 2013 at 7:02 PM, Robert Osfield robert.osfi...@gmail.comwrote: Hi Nick, On 2 December 2013 15:18, Trajce Nikolov NICK trajce.nikolov.n...@gmail.com wrote: I have to model rain drops on wind shield, and not aligned to screen but in 3d. I have set of rain drop models from Modo and looking around for the best approach to get these models randomly placed in 3D on a geometry (the wind shield) as many as possible. I wouldn't personally render rain drops with traditional geometry, rather I'd try and create quads that are textured and using pixel shaders that do motion blur and refraction effects that are required. On the wind shield rain drops are only briefly round and will quickly coalesce with other drops and then run across the screen with gravity and wind effects, here sphere's wouldn't appropriate at all. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- trajce nikolov nick -- trajce nikolov nick ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Compile error, DDS plugin, GL_RG_SNORM and GL_RED_SNORM
Hey Robert -- If no one else has any strong feelings on this, then I'll request you proceed to apply my Fixes for GL3 build as posted to osg-submissions. (As time allows, of course.) Thanks! ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Compile error, DDS plugin, GL_RG_SNORM and GL_RED_SNORM
Hi Paul On 2 December 2013 17:49, Paul Martz skewmat...@gmail.com wrote: Hey Robert -- If no one else has any strong feelings on this, then I'll request you proceed to apply my Fixes for GL3 build as posted to osg-submissions. (As time allows, of course.) Thanks! I haven't had a chance to review your submission yet so will defer specific comments for when I do the review. For general information the symbols are related to the texture_snorm extension: https://www.opengl.org/registry/specs/EXT/texture_snorm.txt Like other extensions it should just be a case of adding a #ifndef #define #endif block to the appropriate header and extension check on passing to OpenGL. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
