If your rocket has serious aliasing problems, please make sure the Anti-Aliasing Setting in your gameplay are 8×.
If the problem still can not be resolved, check to see if you have installed Scatterer (higher than 0.0723). If so, fix the problem as follows:
Enter the game -> Scatterer interface in the bottom right corner (sky blue round ball icon) -> Customize Settings -> Use Projector Mode (MSAA) -> Restart the game