Re: [osg-users] Swapping Textutes for Thermal Signatures
Guy, You can also do it via shaders. Your model would have texture unit 0 = diffuse texture, and tex unit 1 = thermal texture. In the application you would set a uniform that declares which texture unit to use (e.g. uniform int TexUnit). The shader could then select the texture based on the tex unit. Although this sort of technique has a higher learning cost to you (more concepts to pick up) than scenegraph based methods, in the long term it's good exposure given today's GPU evolution... David ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
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 0x 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. If you are not the intended recipient of this email any disclosure, copying, distribution or use of its contents is strictly prohibited. You should notify the sender immediately and then delete it (including any attachments) from your system. Please help out the environment by only printing this e-mail if absolutely necessary - Thank You. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Swapping Textutes for Thermal Signatures
Hi, virtualplanetbuilder (VPB) nowadays support the idea of layers of imagery (texture data) on the same elevation data. You could put your vis data on one layer and the thermal data on another layer. You can dynamically switch between them at runtime. jp Guy Volckaert wrote: 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 message is subject to the CSIR's copyright terms and conditions, e-mail legal notice, and implemented Open Document Format (ODF) standard. The full disclaimer details can be found at http://www.csir.co.za/disclaimer.html. This message has been scanned for viruses and dangerous content by MailScanner, and is believed to be clean. MailScanner thanks Transtec Computers for their support. ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
[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
