Robert Osfield wrote: > Hi John, > > On 9/15/07, John Steinbis <[EMAIL PROTECTED]> wrote: >> Thanks Robert, >> I have this working now without rescaling the image. My solution was >> to pad the image with zeros making it a power of two and then specify >> the correct percentage of the image to use as 2D texture. Not sure if >> this is the best solution but it works and is fast enough for me. > > This is not an elegant way to tackle the problem, workable yes, but > I'd recommend spending a little time - readying up about > TextureRectangle or just disabling the resize of non power of two > textures, you'll end up with a more efficient and elegant solution.
I've used two of these methods to avoid the resizing penalty. The first was to use John's solution to create power-of-two images and only fill it with a subimage that is actually used. I then use the texture matrix to change the texture coordinates so no recoding is necessary. This has worked very well for my application. The second method was to use the TextureRectangle solution, but there are a few drawbacks to this method: it may not be hardware-accelerated, especially on older cards; you lose the ability to generate mipmapped textures; and your texture coordinates become non-normalized, so that you have to know the size of the image when you set up your scene if you do anything fancy. Texture Rectangles are useful but are not the ultimate solution to all problems. Eric _______________________________________________ osg-users mailing list [email protected] http://lists.openscenegraph.org/listinfo.cgi/osg-users-openscenegraph.org
