[osg-users] PositionAndAttitudeTrabsform
Hi, beginner question : i just used the PositionAndAttitudeTransform with setScale(0.1, 0.1, 0.1) to scale down an object in my scene graph. the object indeed scaled down but the light behaviour changed totaly from blue to white, like in specular highlights. for a different object it just colored everything differently. to my understanding scaling an object should not change normals or colors, and therefore the coloring should stay the same and not change that drastically. what am i missing ? Thank you! Cheers, amit -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22021#22021 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PositionAndAttitudeTrabsform
2010/1/1 Gordon Tomlinson gor...@gordon-tomlinson.com Your right it does not scale the normals. So the normal are no longer correct for the model once you scale it See http://www.vis-sim.com/osg/osg_faq_1.htm#f19 That should really mention that rescale only works with uniform scaling. -- 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] Updating tesselator
2009/12/31 Martin Beckett m...@mgbeckett.com I am trying to draw a rubber band wioth the mouse around a selection I get the mouse position, convert into world coords (assumign a plan view) then add the new point to the geometry. I then call osg::Util Tessellator to build the selection into a polygon. This works, but only for the first 4 points! After that I can continue to draw a line but not a filled polygon? You probably need to clear the display list, try _geometry-dirtyDisplayList(); If that works and you are updating it every frame, you may as well turn display lists off. _geometry-setUseDisplayList(false); -- 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] PositionAndAttitudeTrabsform
PositionAttitudeTransform, like any OSG Transform, sets the OpenGL ModelView matrix, and that matrix is used to transform the normals (see the OpenGL spec, or any OpenGL book). So, scaling an object does indeed scale the normals. GL_RESCALE_NORMAL works only for uniform scaling, as noted in Simon's post. For non-uniform scaling, use GL_NORMALIZE. If you're using shaders (and I don't think you are, but if you do in the future), a third option would be to transform your normals directly in the shader code, giving you total control over how they are transformed. Paul Martz Skew Matrix Software LLC _http://www.skew-matrix.com_ 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] Updating tesselator
Yes, I am clearing the display lists (sorry I cut it out with a bunch of other irrelevent code) It's odd that it draws a filled polygon upto 4 points but then no further - it doesn't matter if the extra points would make it convex or simple, or if I go cw or ccw. I know the tesselator works for more complex shapes since I use it elsewhere in the app. Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22026#22026 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] [osgPlugins] blender osgExport with IPO Curve
Hi, First of all, great job to Cedric (and colleagues) for creating the osgExport from Blender. It has helped immensely. The armature animations export perfectly, but I still have not been able to export an animation with an IPO curve (as animation path). The IPO curve seems to work fine in Blender, but when I export, in the log file I get WARNING Curve Curve not exported. Cedric, I see in your July 02 changelog, you write To bake ipo correctly the object must be check in the active scene, else the bake of ipo will fail. I guess this is the answer to my issue, but I can't seem to implement it correctly. Can someone please elaborate on how this should be done? I have attached a very simple blender example file of an object that animates via armature and IPO curve. When I export this file, the IPO curve is lost. Thank you very much! Markooz -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22027#22027 Attachments: http://forum.openscenegraph.org//files/test_path_121.zip ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [osgPlugins] blender osgExport with IPO Curve
Hi Markooz, I will check the issue tomorrow with your blender file, then i will fix the blender exporter if needed. I will give your more information tomorrow. Happy new year Cheers, Cedric -- Provide OpenGL services around OpenSceneGraph and more +33 659 598 614 Cedric Pinson mailto:cedric.pin...@plopbyte.net http://www.plopbyte.net On Fri, 2010-01-01 at 21:13 +, Mark Evin wrote: Hi, First of all, great job to Cedric (and colleagues) for creating the osgExport from Blender. It has helped immensely. The armature animations export perfectly, but I still have not been able to export an animation with an IPO curve (as animation path). The IPO curve seems to work fine in Blender, but when I export, in the log file I get WARNING Curve Curve not exported. Cedric, I see in your July 02 changelog, you write To bake ipo correctly the object must be check in the active scene, else the bake of ipo will fail. I guess this is the answer to my issue, but I can't seem to implement it correctly. Can someone please elaborate on how this should be done? I have attached a very simple blender example file of an object that animates via armature and IPO curve. When I export this file, the IPO curve is lost. Thank you very much! Markooz -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22027#22027 Attachments: http://forum.openscenegraph.org//files/test_path_121.zip ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org signature.asc Description: This is a digitally signed message part ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] PositionAndAttitudeTrabsform
Hi, Right on the button, Thank you very much amit -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=22030#22030 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
