[osg-users] osgParticle::ExplosionEffect: assistance needed

[Mike Metcalf]

I have been exploring osgParticle::ExplosionEffect for use with our software and have run into a few things I haven't yet been able to figure out.

1) We use the Qt resource system to compile and link into our executable some of the binary resources we need, including some images. I have used this system to store a .png file as a resource and have been trying to use that png file as the texture for the particle effects in an ExplosionEffect. When I invoke myExplosion->setTextureFileName(":explosiontexture"), the texture appears not to have been loaded. When I invoke it with an actual path to the same file sitting on my hard drive, it works without problem. So, can anyone tell me if the Qt Resource system's naming convention for referring to internal binary resources is in some way usable with the setTextureFileName interface in ExplosionEffects?

2) The ExplosionEffect seems to be oriented with a z-up orientation. I am using OSGEarth and would like to have the explosions oriented at a local up axis, not a global z-up axis. I tried to add my explosions as a child of a MatrixTransform, but this seemed not to have the desired effect. Any tips or tricks on what my best options are?

Thanks in advance for any help you may provide!
-Mike

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[Sergey Polischuk]

Hi, Mike

1) you can't load from QT resources via osg out of the box. You can write osgDB::ReadFileCallback (and register it via osgDB::Registry) which will open QFile from path specified, read data from it into stream and load object from that stream with correct osgDB plugins.

2) matrix transform should work ok... particle emitter and processors have reference frame and if it not set to absolute - should respect parent transforms. Check if you set correct rotation matrix.

Cheers,
Sergey.

09.05.2013, 21:37, "Mike Metcalf" <metcal...@mac.com>: