Expression for random values for rotation

[mark1977]

I am looking for advice on making an expression to have 10 cluster handles rotate randomly ( each one differently ) during my 1100 frame animation. More specifically, every 15 frames pick a random value between 0 and 35 on X Axis, and smooth interpolate between them.

Think of having reeds blowing underwater, I have 10 of them and really don't want it to look like it's looping copy and paste motion.

Or if there is another way besides expressions I'd also like to know.
Thanks in advance.

[mark1977]

I got a simple random effect going. But I still need help on getting a smooth motion. Here is the expression so far.

pCube1.rotateX = rand (20);
pCube1.rotateY = rand (20);
pCube1.rotateZ = rand (20);

Thanks again in advance.

[nonquad]

float $rate = 5; // this variable controls the rate of sway
float $AMP = 2; // this variable controls how far the reeds sway
pCube1.rotateX = $AMP * noise(time*$rate);
pCube1.rotateY = $AMP * noise(time*$rate + 100);
pCube1.rotateZ = $AMP * noise(time*$rate + 123);

[joojaa]

Noquad maybe its moree convinient to have amp and rate as connections from atributes of an object sice then one could easily change them!

now if we only had a integrator/derivator node all my dreams could come true

[nonquad]

Well, I used variables so that I could give him a self-contained expression chunk which would copy, paste and run without any outside complications.

But I concur 120%. In practice, having everything tied to a nice solid set of control objects is what it's all about!

And I too have had fantasies about integrator/derivator nodes =) Many times!

Problem is, one would need to cache the input, if it were connected to anything but an animation curve. And then it would need a cache update system, kind of like particles and cloth have. It would still be very nice to have.

[joojaa]

Well yes unless the graph curve code could be manipulated to actualy do this derivation should be quite easy (ok i can aproximate but its not just the same). biut an integretor would be more difiicult. BUt sice the splies are mathemathical on can get a picevice itegral of each are inbetween keyframes so storing on value for each keyframe (the use is specialized and maybe you could chhoose if it does this or not!) isnt that bad is it?

[mark1977]

Thanks for the expression, that is pretty much exactly what i needed.