Re: [osg-users] Alpha blending not working on IOS
Hi Thomas, Am 28.03.11 22:40, schrieb Thomas Hogarth: Has anyone used alpha blending on IOS successfully? I could have sworn I have in the past but I've been at this for about two hours now with no luck. I had alpha blending working on IOS, but I used vertex-colors, not materials, and everything worked as expected. If I find some spare time, I can test this code again. cheers, Stephan ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Alpha blending not working on IOS
Hi, ThomasTry setting BlendFunc to stateset also. I think you'll want something like osg::BlendFunc(ONE_MINUS_SRC_ALPHA, SRC_ALPHA);Cheers,Sergey.29.03.2011, 00:40, "Thomas Hogarth" thomas.hoga...@gmail.com:Hi AllThis may be a slightly dumb question but I can't seem to get alpha blending to work on IOS. I've just finished porting my windows code (which works fine) over to IOS but now my Hud Objects alpha doesn't seem to work. The code I use to enable alpha blending on my hud objects is osg::BlendEquation* blendEquation = new osg::BlendEquation(osg::BlendEquation::FUNC_ADD); m_stateset-setAttributeAndModes(blendEquation,osg::StateAttribute::OVERRIDE|osg::StateAttribute::ON); //tell to sort the mesh before displaying it m_stateset-setRenderingHint(osg::StateSet::TRANSPARENT_BIN); m_stateset-setMode(GL_BLEND, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE); m_stateset-setMode(GL_ALPHA_TEST, osg::StateAttribute::ON | osg::StateAttribute::OVERRIDE);// just added this now as a test but still no luck I then set the alpha via a material which is already applied to the stateset with m_material-setAlpha(osg::Material::FRONT_AND_BACK, m_alpha); But no matter what I set m_alpha to I can always see the hud objects (even if i set it to zero). I checked the format of my eaglLayer and it iskEAGLColorFormatRGBA8 as it should be. Has anyone used alpha blending on IOS successfully? I could havesworn I have in the past but I've been at this for about two hours now with no luck. Thanks for any helpTom ___osg-users mailing listosg-users@lists.openscenegraph.orghttp://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] Alpha blending not working on IOS
Hi Stephan Problem solved, I created a .osg file in 3DS Max with a transparent material and that worked. The only difference I could see between that files stateset and my hud objects stateset was that Lighting was enabled. So I re enabled lighting on my hud object and now the alpha blending is working as expected. Must be some kind of optimisation made by the ios drivers, to not use the material info if lighting is disabled, which is why your vertex colour metod worked. Now the question is do I keep using materials for this or should I switch to vertex colours to improve performance. Anyhow, for anyone else with the problem of alpha blending not working on IOS when using a material, make sure you have lighting enabled. Cheers Tom On 29 March 2011 08:53, Stephan Huber ratzf...@digitalmind.de wrote: Hi Thomas, Am 28.03.11 22:40, schrieb Thomas Hogarth: Has anyone used alpha blending on IOS successfully? I could have sworn I have in the past but I've been at this for about two hours now with no luck. I had alpha blending working on IOS, but I used vertex-colors, not materials, and everything worked as expected. If I find some spare time, I can test this code again. cheers, Stephan ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Alpha blending not working on IOS
Hi Sergey Thanks for the tip, I did try that but still no luck, turned out to be that lighting was disabled. I just sent another message with a bit more info. Thanks again Tom PS I'll quickly test if it was a combination of the two. On 29 March 2011 10:32, Sergey Polischuk pol...@yandex.ru wrote: Hi, Thomas Try setting BlendFunc to stateset also. I think you'll want something like osg::BlendFunc(ONE_MINUS_SRC_ALPHA, SRC_ALPHA); Cheers, Sergey. 29.03.2011, 00:40, Thomas Hogarth thomas.hoga...@gmail.com: Hi All This may be a slightly dumb question but I can't seem to get alpha blending to work on IOS. I've just finished porting my windows code (which works fine) over to IOS but now my Hud Objects alpha doesn't seem to work. The code I use to enable alpha blending on my hud objects is osg::BlendEquation* blendEquation = new osg::BlendEquation(osg:: BlendEquation::FUNC_ADD); m_stateset-setAttributeAndModes(blendEquation,osg::StateAttribute:: OVERRIDE|osg::StateAttribute::ON); //tell to sort the mesh before displaying it m_stateset-setRenderingHint(osg::StateSet::TRANSPARENT_BIN); m_stateset-setMode(GL_BLEND, osg::StateAttribute::ON | osg:: StateAttribute::OVERRIDE); m_stateset-setMode(GL_ALPHA_TEST, osg::StateAttribute::ON | osg:: StateAttribute::OVERRIDE);// just added this now as a test but still no luck I then set the alpha via a material which is already applied to the stateset with m_material-setAlpha(osg::Material::FRONT_AND_BACK, m_alpha); But no matter what I set m_alpha to I can always see the hud objects (even if i set it to zero). I checked the format of my eaglLayer and it is kEAGLColorFormatRGBA8 as it should be. Has anyone used alpha blending on IOS successfully? I could have sworn I have in the past but I've been at this for about two hours now with no luck. Thanks for any help Tom ___ 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] Alpha blending not working on IOS
Just to confirm It was only the Lighting issue, although Sergey's tip is still a good one Tom On 29 March 2011 10:35, Thomas Hogarth thomas.hoga...@gmail.com wrote: Hi Sergey Thanks for the tip, I did try that but still no luck, turned out to be that lighting was disabled. I just sent another message with a bit more info. Thanks again Tom PS I'll quickly test if it was a combination of the two. On 29 March 2011 10:32, Sergey Polischuk pol...@yandex.ru wrote: Hi, Thomas Try setting BlendFunc to stateset also. I think you'll want something like osg::BlendFunc(ONE_MINUS_SRC_ALPHA, SRC_ALPHA); Cheers, Sergey. 29.03.2011, 00:40, Thomas Hogarth thomas.hoga...@gmail.com: Hi All This may be a slightly dumb question but I can't seem to get alpha blending to work on IOS. I've just finished porting my windows code (which works fine) over to IOS but now my Hud Objects alpha doesn't seem to work. The code I use to enable alpha blending on my hud objects is osg::BlendEquation* blendEquation = new osg::BlendEquation(osg:: BlendEquation::FUNC_ADD); m_stateset-setAttributeAndModes(blendEquation,osg::StateAttribute:: OVERRIDE|osg::StateAttribute::ON); //tell to sort the mesh before displaying it m_stateset-setRenderingHint(osg::StateSet::TRANSPARENT_BIN); m_stateset-setMode(GL_BLEND, osg::StateAttribute::ON | osg:: StateAttribute::OVERRIDE); m_stateset-setMode(GL_ALPHA_TEST, osg::StateAttribute::ON | osg:: StateAttribute::OVERRIDE);// just added this now as a test but still no luck I then set the alpha via a material which is already applied to the stateset with m_material-setAlpha(osg::Material::FRONT_AND_BACK, m_alpha); But no matter what I set m_alpha to I can always see the hud objects (even if i set it to zero). I checked the format of my eaglLayer and it is kEAGLColorFormatRGBA8 as it should be. Has anyone used alpha blending on IOS successfully? I could have sworn I have in the past but I've been at this for about two hours now with no luck. Thanks for any help Tom ___ 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] Alpha blending not working on IOS
Hi All This may be a slightly dumb question but I can't seem to get alpha blending to work on IOS. I've just finished porting my windows code (which works fine) over to IOS but now my Hud Objects alpha doesn't seem to work. The code I use to enable alpha blending on my hud objects is osg::BlendEquation* blendEquation = new osg::BlendEquation(osg:: BlendEquation::FUNC_ADD); m_stateset-setAttributeAndModes(blendEquation,osg::StateAttribute:: OVERRIDE|osg::StateAttribute::ON); //tell to sort the mesh before displaying it m_stateset-setRenderingHint(osg::StateSet::TRANSPARENT_BIN); m_stateset-setMode(GL_BLEND, osg::StateAttribute::ON | osg::StateAttribute ::OVERRIDE); m_stateset-setMode(GL_ALPHA_TEST, osg::StateAttribute::ON | osg:: StateAttribute::OVERRIDE);// just added this now as a test but still no luck I then set the alpha via a material which is already applied to the stateset with m_material-setAlpha(osg::Material::FRONT_AND_BACK, m_alpha); But no matter what I set m_alpha to I can always see the hud objects (even if i set it to zero). I checked the format of my eaglLayer and it is kEAGLColorFormatRGBA8 as it should be. Has anyone used alpha blending on IOS successfully? I could have sworn I have in the past but I've been at this for about two hours now with no luck. Thanks for any help Tom ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
