Original Post
Hello there, I am doing is something like tetris and have multiple rectangles with a texture move verticallly from the top of the screen to the bottom. When I do so, I have this quite strange effect of "vibrating objects" when I let them move throuh the screen. Most of the time all of them look absolutely smooth but after a few seconds the objects at the top start to "vibrate" vertically irregularly. It is hard to describe how it looks but I would say the object, while moving downwards, is jumping between two positions with one pixel difference at a visible and not stable frequency. Not only that this effect applies to one object, no, it is like an invisible field moving vertically over all the objects making them vibrate for some time, then they stabilize and everything is perfectly smooth again. After about 10 seconds, it repeats. I tried with pretransformed vertices as well as in real 3D with my own transformations but the result is identical. Just to make sure, I replaced my objects by horizontal lines of one pixel height and checked if it has do do with the textures but the effect is the same. Just vibrating lines. Anybody an idea ? Uh, not to forget, I am programming on an Athlon 500 with a Radeon 9250. Yet, I measured that I make about 300 frames per second so there should be no performance problem. Hope somebody can help me on this. Thanks. Lorenz