Sorry, one mistake : *"Note that OpenGL <http://www.devmaster.net/wiki/Category:OpenGL> and Direct3D <http://www.devmaster.net/wiki/Direct3D> use different texture coordinate conventions. In Direct3D, the texture coordinates are (0, 0) at the top left corner, and the **v coordinate increases as you move down. In OpenGL, the coordinates are called **s and **t instead of **u and **v, the (0, 0) point (the origin) is at the bottom-left corner, and the **t coordinate increases as you move up. *"
So don't consider my little drawing as right. Vincent. 2009/1/22 Vincent Bourdier <[email protected]> > Hi Cory, > > Texture coordinates is a basic way to apply a texture on a geometry. > For each vertex, you give a 2D coordinate data to associate a vertex and a > texture point. OpenGl will interpolate the texture pixel between each > vertex, depending on theses coordinates. > > The 2D texture coordinate have to be like this in your texture image: > > [0,0] [1,0] > |------------| > | | > | | > | | > | | > |------------| > > [0,1] [1,1] > > > In your example, with a single file of texture, you set the texture for > each side. > For each texture you set in OSG, you can set a texCoordinateArray. > The index you set pyramidGeometry->setTexCoordArray(*0*,texcoords); > correspond to the texture index you set before, when setting the texture. > > Have a look on Texture coordinate on the web, you'll find a lot of > explanations. > > Hope this will help you. > > Regards, > Vincent. > > 2009/1/21 Cory Riddell <[email protected]> > > I'm working my way through some of the tutorials. Right now I'm on: >> >> http://www.openscenegraph.org/projects/osg/wiki/Support/Tutorials/BasicGeometry >> >> In the code on that page is this: >> >> osg::Vec2Array* texcoords = new osg::Vec2Array(5); >> (*texcoords)[0].set(0.00f,0.0f); >> (*texcoords)[1].set(0.25f,0.0f); >> (*texcoords)[2].set(0.50f,0.0f); >> (*texcoords)[3].set(0.75f,0.0f); >> (*texcoords)[4].set(0.50f,1.0f); >> pyramidGeometry->setTexCoordArray(0,texcoords); >> >> >> Can somebody explain what this is doing? >> >> Thanks, >> cr >> _______________________________________________ >> osg-users mailing list >> [email protected] >> http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org >> > >
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