Hi, I'm trying to develop apps for iOS using GLES 2, so far I managed to build OSG 3.2.1 to use GLES 2 and as long as I create some geometry and manually load/apply GLES 2 shaders everything is fine. On the other hand I am experiencing some issues when I try to load models from files (not containing any shader definition - OBJ, FBX and some OSG/OSGT).
I know that when I use such kind of models then I should provide GLES 2 shaders in order to display them and, to my understanding, there are 3 possibilities: 1) manually apply shaders to the loaded model 2) use ShaderGenVisitor that generates shaders automatically 3) use Shader Composition I tried using ShaderGenVisitor, but it looks like that the shaders that are generated are not GLES 2 compliant (because of missing pre-built attributes), and even though attribute aliasing is applied, not every "gl_" attribute is translated to the corresponding "osg_" version. For instance in the converted version I have a row like this: gl_Position = osg_ModelViewProjectionMatrix * gl_Vertex; Note that only "gl_ModelViewProjectionMatrix" has been converted but for some reason "gl_Vertex" has not changed. Also, there are attributes that are not translated at all, like gl_TexCoord and gl_LightSource. Searching the forum, it looks like that the ShaderGen approach should be replaced by Shader Composition, so I wanted to try it but I'd need some directions to start with it...so far I only managed to enable it like this: state->SetShaderCompositionEnabled(true); Where state comes from the viewer's window. But no model is displayed by the viewer. Actually I am not sure at all that I should use Shader Composition, so my question is: if in my GLES 2 app I want to display models loaded from files (not containing any shader definition), what should I use and where should I look at to get started? Thanks. Alessandro ------------------ Read this topic online here: http://forum.openscenegraph.org/viewtopic.php?p=62475#62475 _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
