Re: [osg-users] Using different textures for the same geometry
The normal way to do this, is that you need to break the model in to component pieces and have a geode for each piece you want to apply a different texture to using the standard OSG state mechanism and you also have ensure you have the correct texture coordinates etc. Trying to have one lump of geometry and then trying to figure out how to apply a different texture to a certain pixel say in a shader is not the way I would go about it, Gordon __ Gordon Tomlinson Product Manager 3D Email : gtomlinson @ overwatch.textron.com __ Self defence is not a function of learning tricks but is a function of how quickly and intensely one can arouse one's instinct for survival - Master Tambo Tetsura -Original Message- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of GMD GammerMaxyandex.ru Sent: Friday, October 10, 2008 6:53 AM To: osg-users@lists.openscenegraph.org Subject: Re: [osg-users] Using different textures for the same geometry Shaders... Hi Robert, Thank you very much for your reply. I have a single geometry and I want to apply different textures for it. That is, imagine a figure of a woman which is a single geometry. However, I have a texture for the head, another one for the body, another one for the shirt, etc... Do you understand? Sorry if I explained it badly, but I am not good explaining things and even worse in english :) Thanks a lot for your reply Robert, Regards, Aitor Яндекс.Почта. Поищите спам где-нибудь еще http://mail.yandex.ru/nospam ___ 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] Using different textures for the same geometry
Hi Aitor, The most efficient way to render such a character is to use a texture atlas and have the texcoords on the geometry pick out the appropriate parts of the character. A decent modelling problem should be able to do the texture atalas/geometry generation for you. Doing it as a post process is possible but is rather awkward. Robert. On Fri, Oct 10, 2008 at 11:35 AM, Aitor Arrieta [EMAIL PROTECTED] wrote: Hi Robert, Thank you very much for your reply. I have a single geometry and I want to apply different textures for it. That is, imagine a figure of a woman which is a single geometry. However, I have a texture for the head, another one for the body, another one for the shirt, etc... Do you understand? Sorry if I explained it badly, but I am not good explaining things and even worse in english :) Thanks a lot for your reply Robert, Regards, Aitor ___ 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] Using different textures for the same geometry
Shaders... Hi Robert, Thank you very much for your reply. I have a single geometry and I want to apply different textures for it. That is, imagine a figure of a woman which is a single geometry. However, I have a texture for the head, another one for the body, another one for the shirt, etc... Do you understand? Sorry if I explained it badly, but I am not good explaining things and even worse in english :) Thanks a lot for your reply Robert, Regards, Aitor Яндекс.Почта. Поищите спам где-нибудь еще http://mail.yandex.ru/nospam ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Using different textures for the same geometry
Hi Robert, Thank you very much for your reply. I have a single geometry and I want to apply different textures for it. That is, imagine a figure of a woman which is a single geometry. However, I have a texture for the head, another one for the body, another one for the shirt, etc... Do you understand? Sorry if I explained it badly, but I am not good explaining things and even worse in english :) Thanks a lot for your reply Robert, Regards, Aitor ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Using different textures for the same geometry
Hi Paul Thank you very much for your reply. I think it will be easier to take the solution #2. For our application, the only restriction we have is that we must use a single vertex array. But if you say that this is possible to do even when using different geometries, I will investigate more about this option. Thanks a lot Paul Regards, Aitor ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
Re: [osg-users] Using different textures for the same geometry
Hi Aitor, Do you want to render your geometry with both textures at the same time and using multi-texturing or have two different variants of your geometry, one with each texture? Robert. On Thu, Oct 9, 2008 at 4:57 PM, Aitor Arrieta [EMAIL PROTECTED] wrote: Hi all First of all, this is my first time writing here so sorry if I do something wrong... Here is my question. I have an obj file, which I have exported from Poser. I have modified this file in order to have only one geometry, that is, there is only one osg::node. This new file works fine in my application and I can see the figure with no problems. However, the problem comes when I try to apply the original textures to this figure, because I have more than one image files for the single osg::Node. As far as I know, there could be two different solutions for this problem: 1- Create a single texture combining all the textures I have and then apply it to the node 2- Apply a different texture to each vertex group For the first one, I have googled for some days and I am not able to find a program which can do it. For the second one, I know which vertex should be with any of the different textures, but I do not know the way to do it from c++ using the osg libraries. Can anyone please help me? I know that my explanation was not very good so if you need further information just ask for it. Thank you very much in advance. Regards, Aitor ___ 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] Using different textures for the same geometry
For solution #1, just create a single image file containing both textures, then go back into your modeling software and set the texture coordinates so that they index into the appropriate portion of the new combined image. You might also take a look at the osgUtil::Optimizer, which has an option to create a texture atlas. For solution #2, you should have a single osg::Geode with two osg::Geometry objects added to it. The two Geometry objects can share the same vertex array, if that makes things easier. Each Geometry has its own StateSet, so each can have its own texture. I hope that helps. -Paul _ From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED] On Behalf Of Aitor Arrieta Sent: Thursday, October 09, 2008 9:57 AM To: osg-users@lists.openscenegraph.org Subject: [osg-users] Using different textures for the same geometry Hi all First of all, this is my first time writing here so sorry if I do something wrong... Here is my question. I have an obj file, which I have exported from Poser. I have modified this file in order to have only one geometry, that is, there is only one osg::node. This new file works fine in my application and I can see the figure with no problems. However, the problem comes when I try to apply the original textures to this figure, because I have more than one image files for the single osg::Node. As far as I know, there could be two different solutions for this problem: 1- Create a single texture combining all the textures I have and then apply it to the node 2- Apply a different texture to each vertex group For the first one, I have googled for some days and I am not able to find a program which can do it. For the second one, I know which vertex should be with any of the different textures, but I do not know the way to do it from c++ using the osg libraries. Can anyone please help me? I know that my explanation was not very good so if you need further information just ask for it. Thank you very much in advance. Regards, Aitor ___ osg-users mailing list osg-users@lists.openscenegraph.org http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
