Re: [osg-users] Single-sided ClipPlane?
Wish someone could of told me, you cant put clipplanes within clip planes, you cant make holes! Is it possible to have more than one clipNode in a scene? if i try 2 clipnodes everything gets clipped to the second node. Any ideas? If I cant use more than one clipNode in a scene im thinking about using a shader to make parts transparant. BUT ive got to figure a way to cap the holes after. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=13016#13016 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
2009/5/24 Paul Martz pma...@skew-matrix.com: http://www.sstk.co.uk/portalRendering/portal.php Unless I'm missing something, couldn't you do this in OSG using an Occluder (for host-side culling) and the stencil buffer (to control screen rendering)? You don't even need that. Just set up the clip planes properly. Translate the cameras position into the portals coordinate frame, then use each edge of the portal and the camera position to construct a clip plane. This should be easy to do in osg. Just need to know where to put the callback. Course it will all go pear shaped if the stuff though the portal uses clip planes, unless your h/w supports lots of them. But I suspect that might happen even with using the stencil buffer. I think you need to get clever to support multi level portals. ie ones where you can see a portal through a portal. IIRC most games with portal rendering don't support multiple levels. -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Just to let people know, portals is not quite what im looking for, its more of an extended type portal, i believe a portal is a plane with a texture of a scene applied to give to look of a scene within a scene, im looking for scenes within scenes but with models coming out from the portal front too. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12856#12856 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
2009/5/24 Paul Griffiths gaffe...@gmail.com: Just to let people know, portals is not quite what im looking for, its more of an extended type portal, i believe a portal is a plane with a texture of a scene applied to give to look of a scene within a scene, im looking for scenes within scenes but with models coming out from the portal front too. portals don't use textures. it's just clip planes, though you will need to clear the depth buffer within the portal. if you want the model sticking out the front you'll have to have another instance of it, with the in portal side clipped off. -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Ive worked out whats required to get my effect working , though im only guessing right now at the math required. Just need 4 clipPlanes facing into the into the scene surrounding the panel. Simple, in theory lol Cheers, PaulG [Image: http://img411.imageshack.us/img411/713/clipplanes.png ] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12864#12864 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Paul Griffiths wrote: Ive worked out whats required to get my effect working , though im only guessing right now at the math required. Just need 4 clipPlanes facing into the into the scene surrounding the panel. Simple, in theory lol Cheers, PaulG Given 3 points on a plane, the plane equation is: osg::Vec3 n = (pt1 - pt0) ^ (pt2 - pt1); float d = -n * pt0; osg::ClipPlane *cp = new osg::ClipPlane(i, n.x(), n.y(), n.z(), d); -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Simon wrote: Paul Griffiths wrote: Ive worked out whats required to get my effect working , though im only guessing right now at the math required. Just need 4 clipPlanes facing into the into the scene surrounding the panel. Simple, in theory lol Cheers, PaulG Given 3 points on a plane, the plane equation is: osg::Vec3 n = (pt1 - pt0) ^ (pt2 - pt1); float d = -n * pt0; osg::ClipPlane*cp = new osg::ClipPlane(i, n.x(), n.y(), n.z(), d); -- http://www.ssTk.co.uk ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Post generated by Mail2Forum Thanks for the math, was wondering how to project a plane based on 3 points. :D -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12870#12870 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
I have a second idea to get my desired effect, but i would much prefer single-sided clipPlanes. If anyone know of other ways too then please do post. [Image: http://img507.imageshack.us/img507/8462/idea.png ] -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12802#12802 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
My second idea of how to create my effect has a flaw, if the rear contents of 2 scrollpanels overlap then ill get the contents of the scrollpanels inside each other. If anyone knows how to create single-sided clipPlanes which only clip when viewed from one side and when viewed from the other side do not clip then do post, its what I need. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12816#12816 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Most state attributes, including ClipPlane, have a 1-to-1 correspondence with OpenGL state, so you can look up what they do: http://www.opengl.org/sdk/docs/man/xhtml/glClipPlane.xml The short answer is that plain vanilla ClipPlane won't do this. However, you could easily attach an UpdateCallback that knows the current view position, and enable/disable the corresponding GL_CLIP_PLANE accordingly. 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 Paul Griffiths Sent: Friday, May 22, 2009 3:59 PM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Single-sided ClipPlane? Hi, Is it possible to set a ClipPlane so it's singe-sided so it only clips when viewed from only one side? and can you select which side? ... Thank you! Cheers, PaulG -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12794#12794 ___ 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] Single-sided ClipPlane?
Paul Martz wrote: Most state attributes, including ClipPlane, have a 1-to-1 correspondence with OpenGL state, so you can look up what they do: http://www.opengl.org/sdk/docs/man/xhtml/glClipPlane.xml The short answer is that plain vanilla ClipPlane won't do this. However, you could easily attach an UpdateCallback that knows the current view position, and enable/disable the corresponding GL_CLIP_PLANE accordingly. Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 -Original Message- From: [mailto:] On Behalf Of Paul Griffiths Sent: Friday, May 22, 2009 3:59 PM To: Subject: Single-sided ClipPlane? Hi, Is it possible to set a ClipPlane so it's singe-sided so it only clips when viewed from only one side? and can you select which side? ... Thank you! Cheers, PaulG -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12794#12794 ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Post generated by Mail2Forum Good idea, should of though of that. Now im thinking about when it should/shouldnt clip. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12828#12828 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
How do you disable a clipPlane? osg::ClipPlane plane = this-clipNode-getClipPlane(2); -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12833#12833 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
ClipPlane is what's known as positional state in OSG, and the plane equation is a StateAttribute that is in effect for your entire RenderStage. You enable or disable it on a per-node basis just like any other state: node-getOrCreateStateSet()-setMode( GL_CLIP_PLANEn, osg::StateAttribute::ON|OFF ); ...where n is the ClipPlane number. This all seems very familiar. I believe this was discussed just recently in this list; check the archives for the past couple weeks. 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 Paul Griffiths Sent: Saturday, May 23, 2009 11:02 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Single-sided ClipPlane? How do you disable a clipPlane? osg::ClipPlane plane = this-clipNode-getClipPlane(2); -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12833#12833 ___ 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] Single-sided ClipPlane?
Enabling/disabling clipPlanes won't do the job, your looking at the side and into the scroll window at the same time. From what i can work out, clipPlanes slice all the way along the model and remove the outer half, so any clipping applied is going to effect what I see at the front of the scroll window too. Or am I missing something? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12839#12839 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
2009/5/23 Paul Griffiths gaffe...@gmail.com: Enabling/disabling clipPlanes won't do the job, your looking at the side and into the scroll window at the same time. From what i can work out, clipPlanes slice all the way along the model and remove the outer half, so any clipping applied is going to effect what I see at the front of the scroll window too. Or am I missing something? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12839#12839 Is this what you are after? http://www.sstk.co.uk/portalRendering/portal.php -- http://www.ssTk.co.uk ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
Simon Hammett wrote: 2009/5/23 Paul Griffiths : Enabling/disabling clipPlanes won't do the job, your looking at the side and into the scroll window at the same time. From what i can work out, clipPlanes slice all the way along the model and remove the outer half, so any clipping applied is going to effect what I see at the front of the scroll window too. Or am I missing something? -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12839#12839 Is this what you are after? http://www.sstk.co.uk/portalRendering/portal.php -- http://www.ssTk.co.uk ___ osg-users mailing list http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org -- Post generated by Mail2Forum Yes, that is what im trying to achieve. -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12851#12851 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
http://www.sstk.co.uk/portalRendering/portal.php Unless I'm missing something, couldn't you do this in OSG using an Occluder (for host-side culling) and the stencil buffer (to control screen rendering)? Paul Martz Skew Matrix Software LLC http://www.skew-matrix.com +1 303 859 9466 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Single-sided ClipPlane?
[Image: http://img177.imageshack.us/img177/9184/singlesidedclipplane.png ] This is the effect im after, if i can have single sided clipPlanes then i can construct a clipBox behind my window so from the outside it clips my scrollpanel behind so my window has virtually no depth, but from looking in to my window the scene within has unlimited depth. Any ideas, I really need this effect. :D -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=12799#12799 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
