Re: [osg-users] Why am I getting this bleed through effect when moving my camera around?
Hi Preet, This look to be an issue of depth precision, the usual way one tackles this problem of rendering two flat objects on top of each other is to use osg::PolygonOffset (see OpenGL docs on glPolygonOffset). Robert. On 20 January 2013 05:42, Preet prismatic.proj...@gmail.com wrote: I have two geometries close together -- one is an osgText object and the other is just a simple set of planar triangles laying flat behind the text. The two are separated by a small distance. Both objects are parented with an AutoTransform. When I move my camera around in a certain way, the object behind the text bleeds through it. When the camera is not being moved, both objects appear fine. I made a small video because I had trouble capturing the issue with a screenshot. In the video, the text is purple. The object in question is the black rectangle with the purple border behind the text. http://www.youtube.com/watch?v=htj168dJHGw When I move the camera relatively fast, you can see the black rectangle's triangles bleed through the text momentarily. I tried messing around with the placement of the objects; I even tried to increase the distance between the text and the geometry behind it a substantial amount but this didn't seem to have an effect. Both objects are in the same render bin. I've never really seen something like this happen before where the effect is only present *while* the scene is moving around. If I move the camera around slow enough or keep it still, the effect isn't visible. Does anyone have any ideas as to what the issue is here? Preet ___ 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
[osg-users] Why am I getting this bleed through effect when moving my camera around?
I have two geometries close together -- one is an osgText object and the other is just a simple set of planar triangles laying flat behind the text. The two are separated by a small distance. Both objects are parented with an AutoTransform. When I move my camera around in a certain way, the object behind the text bleeds through it. When the camera is not being moved, both objects appear fine. I made a small video because I had trouble capturing the issue with a screenshot. In the video, the text is purple. The object in question is the black rectangle with the purple border behind the text. http://www.youtube.com/watch?v=htj168dJHGw When I move the camera relatively fast, you can see the black rectangle's triangles bleed through the text momentarily. I tried messing around with the placement of the objects; I even tried to increase the distance between the text and the geometry behind it a substantial amount but this didn't seem to have an effect. Both objects are in the same render bin. I've never really seen something like this happen before where the effect is only present *while* the scene is moving around. If I move the camera around slow enough or keep it still, the effect isn't visible. Does anyone have any ideas as to what the issue is here? Preet ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Why am I getting this bleed through effect when moving my camera around?
Nevermind -- it turns out my idea of a 'substantial' amount of distance wasn't enough. On Sun, Jan 20, 2013 at 12:42 AM, Preet prismatic.proj...@gmail.com wrote: I have two geometries close together -- one is an osgText object and the other is just a simple set of planar triangles laying flat behind the text. The two are separated by a small distance. Both objects are parented with an AutoTransform. When I move my camera around in a certain way, the object behind the text bleeds through it. When the camera is not being moved, both objects appear fine. I made a small video because I had trouble capturing the issue with a screenshot. In the video, the text is purple. The object in question is the black rectangle with the purple border behind the text. http://www.youtube.com/watch?v=htj168dJHGw When I move the camera relatively fast, you can see the black rectangle's triangles bleed through the text momentarily. I tried messing around with the placement of the objects; I even tried to increase the distance between the text and the geometry behind it a substantial amount but this didn't seem to have an effect. Both objects are in the same render bin. I've never really seen something like this happen before where the effect is only present *while* the scene is moving around. If I move the camera around slow enough or keep it still, the effect isn't visible. Does anyone have any ideas as to what the issue is here? Preet ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
