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
Re: [osg-users] Display of lines and edges on Retina/10.8 Mac
Hi an update: still haven't found the reason for this, but it turns out if happens on a machine with 10.8 installed, not necessarily a Retina display. Could someone with a 10.8 machine try opening the file attached in the original message in osViewer and tell me if it looks like the attached image? Cheers, Mike On 10 Jan 2013, at 11:50, Mike Krus m...@mve.commailto:m...@mve.com wrote: Hi I'm having a weird display issue when displaying lines and edges over a surface on a Retina Mac. We display surfaces and when draw the boundary line and a subset of faces (which are selected by the user) is also overlaid using faces in line mode. See attached image if it's clearer… I normally works fine but on a MacBook Pro with a 15 Retina display nothing shows. I've attached an osgt file that illustrates the issue. If you open in osgviewer, you can't see the lines… Any ideas what may be going on? Cheers! Mike Mike Krus (PhD) - Principal Software Engineer Midland Valley Exploration 144 West George Street Glasgow G2 2HG, UK Tel: +44 141 332 2681 Fax: +44 141 332 6792 Screenshot_09_01_2013_09_17.png MOVE_Scene.osgt___ osg-users mailing list osg-users@lists.openscenegraph.orgmailto: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] [vpb] osgdem with terrain from worldMachine
Hi, i 'm sorry for the long delay but i miss this replay. i post some screenshot maybe explain better the issue. Yes it seems a texture issue but maybe also happens because it lacks of geo reference. ... Thank you! Cheers, walter -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=52039#52039 Attachments: http://forum.openscenegraph.org//files/landscape01_436.png ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] [vpb] osgdem with terrain from worldMachine
Hi, below you can find my colour and height maps from Worldmachine, if someone can take look at would be appreciated. Thanks! Cheers, walter -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=52040#52040 Attachments: http://forum.openscenegraph.org//files/maps_823.zip ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Creating a billboard shader for OpenGL ES 2
Hiya, This is somewhat related to my last thread (maybe I should have just explained the situation from the beginning). I'm trying to create a shader that does billboarding for hundreds of objects at once (where using AutoTransform is too slow). I merge all these objects together to reduce the number of draw calls, and pass along specific vertex attribute data (specifically model-space relative vertex data when I want the billboard center to be the model's center) and uniforms (camera vectors) to do the required billboard transform in the shader. This kind of works, but the result is 'jittery' compared to AutoTransform. I don't know whether its the way I specify the uniform update callback or if its related to reduced shader precision (the coordinates I used are all close to the origin though, so I hope that's not the case) or something else entirely. I created a minimal example that reproduces the issue [1]... (just copy-past-compile). The example shows a square billboarded with AutoTransform working perfectly, and my not so great example directly behind it. [1] https://gist.github.com/4582261 * Does anyone know why my example billboard implementation causes that jitter/delay? * Or, has anyone created a better shader that can do billboarding for batched geometry (and if so, could they maybe share how)? Preet ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
