expression question

[robcat2075]

If i want to have an object decrement its Y position every frame I should be able to do a standard value reassignment like Y=Y-1, shouldn't I?

[robcat2075]

I guess the problem is that expressions are continuously evaluated and not once per frame?

[mtpeak2]

Why not just key key the -1 on the first frame, then set the post interpolation to accumulate.

 

If you want to use an expression, use the "get time" function.

[Xtaz]

I don't have A:M here..... but i guess that you must to use the Y-GetTime()...

Y-1 ( frame 1)

Y-2 ( frame 2)

Y-3 ( frame 3)

.

.

.

Y-n ( frame n)

[robcat2075]

Yes, I will have to GetTime()

 

Why not just key key the -1 on the first frame, then set the post interpolation to accumulate.

 

This is only the first step in a more involved problem with expressions. Eventually I want to do crowd simulation but the first step is getting something predictable to happen each frame.

[mtpeak2]

GetTime()*-24

 

This expression will translate -1cm every frame (24fps). If the animation is 30 fps, use -30 as the multipler. If you want it to move more than 1cm, add a second multipler.

[Xtaz]

GetTime()*-24

 

This expression will translate -1cm every frame (24fps). If the animation is 30 fps, use -30 as the multipler. If you want it to move more than 1cm, add a second multipler.

perfect ....