Quote:Original post by gzboli

Quote:but it is not smooth when sword changing position quickly.

To address this specifically... If a sword swing takes 1/2 of a second and the game is running at 30 fps then that swing only lasts 15 frames. If you are generating only one new point per frame for the trail then it may look jagged. Have you tried you taking multiple, interpolated samples each frame?

Yep, you can update your animation at a higher frequency than your frame rate to find intermediate points or you can pass a spline through the top and bottom set of points and find intermediate points that way. Running the animation at a higher frequency is likely to be higher quality but more CPU intensive.

I would recommend using a catmull rom spline as this passes through all the points generated by the animation. You will have to duplicate the current time point in order that the trail actually reaches the current frame.

http://www.mvps.org/directx/articles/catmull/

Cheers,
Martin