[osg-users] osgconv "noTriStripPolygons" give tri. fans only

Hi, Converting an obj file to ive with osgconv gives me unexpected results with the option noTriStripPolygons in the OSG-3.4.1 release. The osgviewer stats tell me that the created model has more than four times as many vertices than the original obj file and only triangle fan primitives. One d

[osg-users] Is it possible to clear just certain textures in a framebuffer with multi target rendering?

Hi, Is it possible to clear just certain textures in a framebuffer with multi target rendering? i am searching for equivalent functionality for glClearBufferfv. Any help would be greatly appreciated. example shader code: out vec4 fragcolor1; // first target out vec4 fragcolor2; // second targ

Re: [osg-users] Is it possible to clear just certain textures in a framebuffer with multi target rendering?

Hi, This can usually done by setting the explicit drawbuffer and a consecutive call to glClear with the appropriate color set. In OSG-terms I'd use a separate camera pass with the appropriate buffers bound. Another option, if you need to selectively write to a certain color buffer only is to u

Re: [osg-users] osgconv "noTriStripPolygons" give tri. fans only

Hi Kari, Without testing the data or similar first hand is not possible to give you a definitive answer to what is going on. Could you post a link to your data or other data that exhibits similar behaviour? As a general comment, it sounds like the scene graph is not well balanced, it might be th

Re: [osg-users] osggeometryshaders example question

Thanks! Cheers, Mike -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=71703#71703 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-

[osg-users] Mirror transformation

Hi, this is probably a trivial question but what is the most straithforward way to mirror a node? I would like to use a MatrixTransformation so I simply set a negative scaling but the resulting node is totally black. Is it the expected result or did I miss something? I thought it was usefull to

Re: [osg-users] Is it possible to clear just certain textures in a framebuffer with multi target rendering?

Hi Sebastian, Thanks for your reply. It worked using 2 cameras passes to achieve the result. I was wondering to achieve the same result with single pass. I will be working huge models and i didn't want to run 2 passes. Is there any plan to add this extension to OSG? Thank you! Thanks and Regar

Re: [osg-users] Is it possible to clear just certain textures in a framebuffer with multi target rendering?

Hi Amudhan, Hi Sebastian, Thanks for your reply. It worked using 2 cameras passes to achieve the result. I was wondering to achieve the same result with single pass. I will be working huge models and i didn't want to run 2 passes. Since you're doing MRT and multiple passes anyway, can't you sim

Re: [osg-users] Mirror transformation

I forgot to mention that the geode inherit from the root node a 2-sided lighting with different materials in front and back side. Cheers, Ale -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=71707#71707 _

Re: [osg-users] Mirror transformation

Hi Ale, You have several layers of different of effects that you are decorating your subgraph with - ClipNode, ShadowedScene, osgFX::Outline, I haven't come across anyone using such a combination before so it could be that some interaction is at play, none of these nodes are written with the other

Re: [osg-users] Mirror transformation

IMO, it happens that, because of the mirror transformation (i.e. a negative scale factor in the global transformation), back facets do appear as front facets on the projection plane, and viceversa. And because of the 2-sided model lighting, normals are reverted when rendering the front facets (as

Re: [osg-users] Limit in size of VBOs?

Hi Robert, I get your point about the ill-defined target. It makes sense. PS: it is usually a good sign when people get old (that is slowly) but this is another debate. Thanks for your answer ;) Antoine -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.

Re: [osg-users] Mirror transformation

Hi Robert, thank you for the quick answer. I use this scene graph structure to set some standard rendering features to scene objects... so it is not easy to change it for me. Anyway I tried to export the scene in osg format and change manually all groups that can give problems (clipnode, outlin

Re: [osg-users] Mirror transformation

Hi Gianluca, I tried your suggestion and it worked. It is a little tricky for me becouse I need to analyze on the fly the transformation matrix and apply osg::FrontFace by consequence but it works. Thank you. Ale -- Read this topic online here: http://forum.openscenegraph.o

Re: [osg-users] Mirror transformation

Happy to hear that it works. BTW, actually the check is a bit more complicated, because you might want to apply mirroring against several axes in sequence. Once you have the global transformation of the mirrored object, the correct check is the following. Get the determinant of that global trans

Re: [osg-users] Mirror transformation

Hi, yes, I can have mirror on each axis so I have already implemented a check similar to the one you suggested. Thank you for the clarification. Ciao, Ale -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=71714#71714 ___