I am trying to render very large imagery files (e.g. 14000x10000) in an OpenGL Scene. To load the imagery, I first create a set of smaller tiles that can be loaded as textures on the computer's graphics card (512x512 or 1024x1024). I then render only the tiles that are visible in the OpenGL scene. When the user's view is zoomed in close to the imagery I only render a few tiles and the frame rate is sufficiently high (60 fps). However, when I zoom out and more tiles are visible, the frame-rate drops considerably (1-2 fps). I thought that mipmapping would take care of this by rendering smaller tiles, but I do not see an improvement when using mipmapping with regards to the frame rates when the view is zoomed out.
My question is this: If the user zooms out far enough where the entire image is visible in the OpenGL scene, how should the image be rendered to keep the frame rate high?
Thanks,
Curtis
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