Today I started using the Message mechanism in WndProc during TERRAIN RENDERING, I used the control of the direction of the keyboard to the direction of the keyboard, but it was found that there was a problem that it became discontinuous when the image is displayed. A bit jumping. Analysis, it may be that the mechanism of Message makes the processing a bit delay. Later, the keyboard processing mechanism in the DX LIB will be used, and everything is solved. Get very Smooth. It is time to study its implementation mechanism.