Re: [osg-users] Different textures on each face of a geometry?
Hi Ku, well, you will only see one side of the face at a time - front or back. So to not go very complex, you can add cull callback where based on the face normal you change the texture and the uvs. I think this can work -Nick On Mon, Aug 2, 2010 at 1:18 PM, Ku Krapox kukra...@gmail.com wrote: Hi Nick, If you mean using osg::Geometry::setTexCoordArray, that's what I was doing until now, but I can't anymore since I want to put 2 textures on a single Geometry AND show different parts of them... But if this is not possible without modifying the geometry, I could get by with a simple method to put half of an image into a texture, which I'd display completely. This seemed easier to me, but I don't know if it is doable and how to do it? Thanks for any advice! Cheers, Ku -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30472#30472 ___ 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] Different textures on each face of a geometry?
Hi Nick, If you mean using osg::Geometry::setTexCoordArray, that's what I was doing until now, but I can't anymore since I want to put 2 textures on a single Geometry AND show different parts of them... But if this is not possible without modifying the geometry, I could get by with a simple method to put half of an image into a texture, which I'd display completely. This seemed easier to me, but I don't know if it is doable and how to do it? Thanks for any advice! Cheers, Ku -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30472#30472 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Different textures on each face of a geometry?
Hi Ku, You can't assign two textures in quite the way you are looking for, but your can certainly achieve the results you are looking for, an even doing by several different ways. One of the easiest ways ways would be to have one osg::Geometry that has the planar geometry you want, then have two osg::Geode that you attach this geometry to. Then on each of these osg::Geode you assign a StateSet with the Texture you want. The final trick to make it all work is to enable GL_CULL_FACE and swap which face is culled by the OpenGL triangle rasterization step by using osg::CullFace and assign one branch to cull the FRONT and the other the BACK. Robert. On Fri, Jul 30, 2010 at 1:21 PM, Ku Krapox kukra...@gmail.com wrote: Hi all, I'm trying to create a simple, planar figure, covered by two rectangular textures, one on each face. For now I couldn't find a better way than creating two geometries very close to each other and fill each one with a different texture. It looks fine while the geometry doesn't change too much, but if I displace the vertices the two geometries start to overlap which result in an ugly mix of the two textures. And I can't do anything about it because of the complex deformation of my object... So I had this idea : is there a way to display different textures on each side of a single geometry? With osg::Geometry::setTexCoordArray maybe?? If not, I could get by with the normals of my geometries... Is there a way to get the normals of a vertex array, as vectors? An if not, how to achieve this simple effect, of a two-sided geometry with different images on each side?... :? Thank you! Cheers, Ku -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30428#30428 ___ 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] Different textures on each face of a geometry?
Hi Robert, Thanks for your reply. :) Your solution looks great, I think it'll do the trick! I have another question : Is there a way to create an osg::Texture2D containing only one part of an image, instead of loading the whole image? Typically I want to create textures with only one half of an image. Is this doable? Or is there an easier way to display only one half of an image on my geometry, by configuring the StateSet maybe?... Thanks! Cheers, Ku -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30431#30431 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Different textures on each face of a geometry?
you can control the part of the image you want to display thru the uv coordinates in your geometry -Nick On Fri, Jul 30, 2010 at 6:33 PM, Ku Krapox kukra...@gmail.com wrote: Hi Robert, Thanks for your reply. :) Your solution looks great, I think it'll do the trick! I have another question : Is there a way to create an osg::Texture2D containing only one part of an image, instead of loading the whole image? Typically I want to create textures with only one half of an image. Is this doable? Or is there an easier way to display only one half of an image on my geometry, by configuring the StateSet maybe?... Thanks! Cheers, Ku -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=30431#30431 ___ 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
