Re: [osg-users] Combining particles with different textures
Hi Martin, The particle system indeed supports a tiled texture that will be selected based on it's age. Since all mechanisms are there it should be quite easy to make a small modification to let emitters determine the texture tile and disable updating of the texture tile. When mixing fire and smoke you typically would want the fire to be emissive and the smoke to be lit by scene lights. This can be done from within the same texture by using pre-multiplied alpha. regards, Roland Smeenk -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15700#15700 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Combining particles with different textures
I just looked at the cessna example, and it seems to have the z fighting problem I tried to describe. If you turn the camera around the plane, at some point the fire jumps over the smoke. The two particle systems are not really mixing. Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15699#15699 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Combining particles with different textures
Hi Martin, I'm trying to work out how to combine particles with different textures. I want to create a fire particle system where I can dynamically change the amount of fire-, smoke- and spark-particles. I haven't found a good way to do this yet. I have no specific answers to offer, but have you looked at the cessnafire.osg file? It has fire and smoke on the cessna. You could open that file and see how it does it. http://www.openscenegraph.org/projects/osg/browser/OpenSceneGraph-Data/trunk/cessnafire.osg?rev=8969 Hope this helps, J-S -- __ Jean-Sebastien Guayjean-sebastien.g...@cm-labs.com http://www.cm-labs.com/ http://whitestar02.webhop.org/ ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[osg-users] Combining particles with different textures
Hi, I'm trying to work out how to combine particles with different textures. I want to create a fire particle system where I can dynamically change the amount of fire-, smoke- and spark-particles. I haven't found a good way to do this yet. My first idea was to overlay multiple particle systems. This has the problem that the particles of the different kinds start z-fighting. Depending on camera position, different kinds of particle are rendered on top. My second thought was to create a single particle system that has emitters for the different particles. I can add multiple emitters to a particle system with different particle prototypes. I can only assign one single texture to a particle system. This would be OK if I could specify different texture coordinates for the different particle prototypes. There is the method in the particle class "setTextureTile" that I can use to let a single particle loop through the tiles of a texture during its lifetime. But there is no way to set a start and end tile, so the particle always loops through all tiles. Is there something I don't see? Or is there currently no way to add differently textured particles to a single particle system? If there is none, the easiest way to change this would be to add a setStartTile and setEndTile method to the particle class so that I can assign different tile segments to different particles. Thank you! Cheers, Martin -- Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=15697#15697 ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
