Another approach might be , If the geom is the same for both or multi spectral states, it would be cheaper just to swap the textures and all you need is to create 2 sets of osg::State sets one with your normal out the window images and the other with your thermal etc, then simply swap the states sets on the relevant nodes , saves duplicating all the geometry. And if your textures have naming scheme etc then you can write a straight forward visitor to build these state sets for you
______________________________________________________________________________ Gordon Tomlinson gor...@gordontomlinson.com IM: gordon3db...@3dscenegraph.com www.vis-sim.com www.gordontomlinson.com ______________________________________________________________________________ -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Colin Rayment Sent: Friday, February 13, 2009 5:12 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Swapping Textutes for Thermal Signatures We are currently doing something similar. We've considered two approaches:- One involves providing a switch node for each node/geometry that applies a different texture. One path applies the normal texture and the other applies the thermal texture, both branches then reference the same geode containing the geometry. By changing the status of each switch node it is then possible to select either the normal or thermal views. The other approach adopts a similar structure but with a group node replacing the switch node and each branch having a different node mask e.g. 1 for normal, 2 for thermal. The relevant view is then obtained by setting the appropriate mask settings when doing the cull traversal. Our view is that the former has the benefit of explicitly setting the viewing mode within the structure of the model and could be considered more appropriate for situations where the viewing mode doesn't change that often, but has issues if dynamically switching between viewing modes in that all the associated switch nodes will need to be changed. It also doesn't allow support for multiple views with differing viewing modes. The latter provides the benefit of a single setting changing the viewing mode and thus providing an easier method to switch between modes and also allows multiple views to be rendered simultaneously with different viewing modes. However it does require your viewer to explicitly set the mask settings as the default setting 0xffffffff would render both views simultaneously. Hope this helps Colin -----Original Message----- From: osg-users-boun...@lists.openscenegraph.org [mailto:osg-users-boun...@lists.openscenegraph.org] On Behalf Of Guy Volckaert Sent: 13 February 2009 00:50 To: osg-users@lists.openscenegraph.org Subject: [osg-users] Swapping Textutes for Thermal Signatures Hi, I was wondering what’s the best way to simulate thermal signatures for targets and the terrain (i.e heat vision). One simple and easy way is to load 2 models - one for day view and another for thermal view. However, this poses a big problem for the terrain. I really don't want to load the geometry of 2 terrains since that would require too much memory. BTW, I use the term "model" to refer to an OpenFlight (FLT) file that I load. Since the geometry of both day and thermal models are identical (at least in my case), I should be able to load the day model and then load the textures of the thermal model (without loading the geometry of the thermal model). This can easily be done by using a filename convention such as adding the suffix "_tml" at the end of every thermal texture filename. This is all well in theory, but how do I implement it (I am still a rookie). Can anyone help me on this? BTW: I know that there are several techniques to produce good looking thermal signatures using shaders, but that's too fancy for me right now. I just need something simple that won't consume all my memory. ------------------ Read this topic online here: http://osgforum.tevs.eu/viewtopic.php?p=6732#6732 _______________________________________________ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org This email has been scanned for all known viruses by the MessageLabs Email Security System. Please help out the environment by only printing this e-mail if absolutely necessary - Thank You. This email has been scanned for all known viruses by the MessageLabs Email Security System. Systems Engineering & Assessment Ltd - Beckington Castle, 17 Castle Corner, Beckington, Frome, Somerset, BA11 6TA, UK is registered in England and Wales with the company number 2430846. The contents of this email (including any attachments) are confidential and may be legally privileged. 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