Re: [osg-users] More lights in scene!
Hi, all. This is very good site about lighting and another graphic effects: http://sunandblackcat.com/other.php -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69177#69177 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
Neat. I did the same thing for a game I wrote, but I used custom shader-based lights instead of OpenGL lights, and I used 4 lights instead of 8. The most interesting takeaway was that applying shaders for 0, 1, 2, 3, or 4 lights (5 different shaders) was very slow due to shader swapping. The fastest combination I found was to only compile shaders for 0 or 4 lights, and if I only needed to apply 1, 2, or 3 lights I could set some of their color uniforms to black. -- Terry Welsh http://www.reallyslick.com > > Hi, > > Check out my solution - no shaders needed: > http://forum.openscenegraph.org/viewtopic.php?t=15339 > > Cheers, > Jannik > > -- > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=69123#69123 > ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
Nickolai, here is good link I have started with, with code samples http://www.ozone3d.net/tutorials/glsl_lighting_phong.php On Mon, Oct 24, 2016 at 5:37 PM, Robert Osfield wrote: > On 24 October 2016 at 16:20, Nickolai Medvedev > wrote: > > I need colour of the surface geometry of objects in the scene. > > gl_Color with GL2, or osg_Color if you have enabled the vertex to > vertex attrib aliasing. This aliasing is on by default for GLcore or > GLES2 profiles. > > Go look at the shaders in the OpenSceneGraph-Data/shader examples. > > 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] More lights in scene!
On 24 October 2016 at 16:20, Nickolai Medvedev wrote: > I need colour of the surface geometry of objects in the scene. gl_Color with GL2, or osg_Color if you have enabled the vertex to vertex attrib aliasing. This aliasing is on by default for GLcore or GLES2 profiles. Go look at the shaders in the OpenSceneGraph-Data/shader examples. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
I need colour of the surface geometry of objects in the scene. I experiment with shaders and trying to create light sources with their help. And, Robert, thank you for your patience. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69147#69147 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
HI Nickolai, On 24 October 2016 at 11:37, Nickolai Medvedev wrote: > If we need diffuse lighting, we need get color of the scene, send him into > shader as uniform, then, for example, if we need point light, add color with > radius. > > So, question is: how to get our scene color? Need create light shader for > each light? I really don't know what exactly you mean. Are you already using shaders for lighting? Using old OpenGL fixed function for lighting? What you mean by colour of the scene? The colour of the light source? The colour of the surface geometry of objects in the scene? I really can't provide answers to open ended questions. Robert. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
Hi, Robert. If we need diffuse lighting, we need get color of the scene, send him into shader as uniform, then, for example, if we need point light, add color with radius. So, question is: how to get our scene color? Need create light shader for each light? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69138#69138 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
HI Nickolai, The limit to 8 lights is part of the GL fixed function pipeline so if you uses shaders you can address this. By co-incidence I've started some experiments with extending the #pragma(tic) shader composition framework to blurr the line between fixed function and shaders which may provide a possible route to adding more than 8 lights. If this goes well then I'll be introducing this work to the community. It's bleeding edge work though, I really don't know yet whether I can make it all work. Robert. On 23 October 2016 at 20:12, Nickolai Medvedev wrote: > Hi, community! > > I have a question: how i can create more than 8 lights in scene. Need new > shader-based light system? If so, how i can make these? > > -- > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=69119#69119 > > > > > > ___ > 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] More lights in scene!
Hi, Jannik. Thanks! OpenMW - amazing project! Good luck to you and your team! -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69124#69124 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
Hi, Check out my solution - no shaders needed: http://forum.openscenegraph.org/viewtopic.php?t=15339 Cheers, Jannik -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69123#69123 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
yes ! .. That is very nice project. Here is the video https://www.youtube.com/watch?v=HIrq4sF5QO8 On Sun, Oct 23, 2016 at 9:52 PM, Nickolai Medvedev wrote: > Hi, Trajce! > > Here i found: > > https://github.com/bcrusco/Forward-Plus-Renderer > > Well, deferred renderer is more suitable for a large number of light > sources. > And it is necessary to create also new materials system... > > -- > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=69121#69121 > > > > > > ___ > 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] More lights in scene!
Hi, Trajce! Here i found: https://github.com/bcrusco/Forward-Plus-Renderer Well, deferred renderer is more suitable for a large number of light sources. And it is necessary to create also new materials system... -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=69121#69121 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] More lights in scene!
Hi Nickolai, this is the topic that I am still learning ... Do a search for Forward+. Here is some opensource OSG implementation: http://openig.compro.net the source is here: https://github.com/CCSI-CSSI/MuseOpenIG .. Look there for the ForwardPlus plugin. Short story, without digging into the details of F+ itself, you encode your light attributes (color, direction, range ..) into float texture (or TextureBufferObject) and in your shaders you unpack the light attributes from these and perform your lighting. This way you are not limited to the OpenGL constructs for lights. It is really advanced topic but interesting as well indeed ... Cheers, Nick On Sun, Oct 23, 2016 at 9:12 PM, Nickolai Medvedev wrote: > Hi, community! > > I have a question: how i can create more than 8 lights in scene. Need new > shader-based light system? If so, how i can make these? > > -- > Read this topic online here: > http://forum.openscenegraph.org/viewtopic.php?p=69119#69119 > > > > > > ___ > 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
