Re: [Flightgear-devel] Shader optimization
>> Speaking of which - it'd be nice to have local north as well defined >> direction as well - that would allow for things like the snowline >> being higher on south slopes ... > > In the Northern hemisphere ;-) Quite so - but once you have a north-pointing vector, the rest is trivial because you can pass geographical location as uniform and use that to compute the magnitude and sign of the bias in a one-liner... * Thorsten -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
[Flightgear-devel] Terragear updates/changes
To all whom it may concern, terragear has seen some bigger updates recently and we are constantly working on improving the toolchain. This also includes some cleanup and thus removal of older tools where better alternatives have been developed in the last 12+ years. I created a branch, named "pre_vec3" where these older tools still exist for reference and historic reasons. The development in the master branch now goes towards porting the Point3d classes towards the more proven SG alternatives SGGeod and SGVec3 so that we can finally remove Point3d in TG as well. With this came the removal of the older genapts (810) program, which we decided would be too difficult to maintain along the newer version. As I said, it still exists in the pre_vec3 branch. Just FYI. Cheers Chris -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Shader optimization
> Speaking of which - it'd be nice to have local north as well defined > direction as well - that would allow for things like the snowline > being higher on south slopes ... In the Northern hemisphere ;-) Regards, -Fred -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Shader optimization
> Even the oldest hardware that > supports OpenGL programmable shaders implements vector operations, and > a vector multiply-add has, as far as I know, the same cost as a scalar > operation. On the other hand, the shader compiler might be able to > combine multiple scalar interpolations into vector ops. ... in which case we'd see a sudden jump in performance whenever we fill a new vector, so assuming the larges vector size is a vec4, having 6 or 8 varying float wouldn't make a difference but having 9 would require to start a new vec4 and cost extra. Should be easy enough to test... thanks for the explanation. > But never rely on something like this in a renderer. Well, we do need the local 'up' direction in the renderer badly (light, fog, snowline,...) so when we can't rely on z being up, we need to transmit that info in a different way. Any suggestions? Speaking of which - it'd be nice to have local north as well defined direction as well - that would allow for things like the snowline being higher on south slopes or different tree cover on north and south facing slopes. * Thorsten -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct ___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
Re: [Flightgear-devel] Physics engine of Flightgear
There are two primary ones: - YASim - JSBSim See: http://wiki.flightgear.org/Flight_Dynamics_Model Jon From: kunai...@yahoo.co.jp [mailto:kunai...@yahoo.co.jp] Sent: Wednesday, October 17, 2012 12:28 AM To: flightgear-devel@lists.sourceforge.net Subject: [Flightgear-devel] Physics engine of Flightgear Hello, I’m kunai. Now I use Flight gear but I have three questions. 1 Is there a physics engine of Flight gear in SimGear? 2 What’s name a physics engine? 3 If I study SimGear and physics engine, what should I do? I beg your kindness. -- Everyone hates slow websites. So do we. Make your web apps faster with AppDynamics Download AppDynamics Lite for free today: http://p.sf.net/sfu/appdyn_sfd2d_oct___ Flightgear-devel mailing list Flightgear-devel@lists.sourceforge.net https://lists.sourceforge.net/lists/listinfo/flightgear-devel
