i'm not sure what bitmap you mean, i'm talking about using the dll in general, i used it with the refraction shader, and as soon as it starts rendering to full screen then the screen goes black...for the water shader that was posted, the water goes black...if it's included with this package i have no problem with it, but when i copy the four lines of code, and include the dll in my acknex_plugins directory, it still just turns these things black...