March 26, 2012, 11:31:59 am
Hi Chun Wing,
1) Apply the "Cloud Settings" and/or "Sun postion" effects to your clip.
2) Set keyframes by clicking on the small circular buttons next to the sliders that you want to animate.
3) Drag the time slider to the end of your clip.
4) Click on the small circular buttons again to set new keyframes.
5) Adjust the effect sliders.
6) Click on the Play button (or drag the time slider back and forth) to preview the animation.