Thanx Martin for maskmotionblur tip.. it's working.. but I have a problem with the motionblur. MotionBlur is not working the way it should. When I increase the sample value from about 5 to 50 no visible smoothing is happening. In some cases the values 2 and 50 produces allmost identical images?!?!?! Do others have this problem?? I really need smoother motion blur!!! HELP!!!!!!
Xyxel
The only way I got smooth MotionBlur is by using AfterEffects' "ReelSmart Motion Blur" plugins.
It works really fine and its faster than Combustion's.
Go there... http://www.revisionfx.com and look for Motion Blur for more info.
Koolaid
It sounds like you're applying the motion blur to an individual layer. While combustion will let you do this, the number of samples can only be determined by the original footage, so greater samples won't appear to do anything. If you're trying to get motion blur on the movement of the layer, you'll need to nest the layer first, then apply the motion blur operator. Then the samples can work on the subpixel movement of that layer, not just the frames of the layer.