Hi Gazi, The texture coordinates are zero because the underlying .obj file doesn't have any texture coordinates. You can't create something out of nothing unless you have some well defined mathematical rules for mapping coordinates or normals to texture coordinates.
I haven't come across any specification in the .obj or .mtl file for this, perhaps there is some undocumented means, but I'll leave this up to you to divine - you have all the source code. Robert. On 7/3/06, Gazi Alankus <[EMAIL PROTECTED]> wrote:
I have been trying to use textures in Wavefront .obj files and use them with osg. First I had trouble finding some editor/viewer that correctly displays obj files with textures. After I found one, I realized that osg cannot display the textures in models that the other program can. Therefore I believe texture support in the obj plugin of osg is broken. Here is the obj viewer that can show obj files with correct textures: http://www.xmission.com/~nate/es/statue.zip After you build it and run the executable in statue directory, it displays the data/rose+vase.obj with its texture on the vase. You can use "statue -s file.obj" to see other obj files. When I import rose+vase.obj in my osg program, the vase looks all black. To verify that the problem is not my code, I used osgconv to convert the obj file to an osg file and used osgviewer and the vase was black again. I tracked the problem down to this: only the bottom-leftmost pixel of the texture is used as a texture. Its value is merely multiplied with the material colors of the texture stateset. I realized that the osg file created by osgconv doesn't have any TexCoordArray section. Probably since all texture coordinates are zero, only one pixel on the corner is used. Therefore I think texture coordinates should be created in the obj importer code. By the way, the program here seems to totally ignore the texture in the obj file: http://www.sgi.com/products/software/opengl/examples/more_samples/zip/smooth.zip I wonder if it is because of my video card (Intel 82852/855GM). It would be great if someone can fix this and add the correct texture coordinates (or tell me what I'm doing wrong). Gazihan _______________________________________________ osg-users mailing list [email protected] http://openscenegraph.net/mailman/listinfo/osg-users http://www.openscenegraph.org/
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