Collecting Cumulative value of a Parameter

[7ofDiamonds]

I'm trying to extract the cumulative value of a parameter over frames and plug that value into a different channel.

How can I do this? 

 

Can I use for loops for this?

If so, how would I write it?

 

Thanks!

[rayman]

I'm almost sure you can do it using CHOPs.

[7ofDiamonds]

Could you explain how this is done? I'm a little unsure of how to start. 

 

I'm almost sure you can do it using CHOPs.

[ayidi]

Could you explain how this is done? I'm a little unsure of how to start. 

 

- Create a CHOP network

- Reference the channel

- Connect an Area CHOP

- Toggle the export flag

[eetu]

Here's a quick hip, both in OBJland with chops and in SOPland with accumulating a detail attribute inside a Solver.

 

ee_cumulative_parameter.hip

[7ofDiamonds]

- Create a CHOP network

- Reference the channel

- Connect an Area CHOP

- Toggle the export flag

 

Thanks, that was helpful!

 

Here's a quick hip, both in OBJland with chops and in SOPland with accumulating a detail attribute inside a Solver.

 

 

This example is great! Thanks for including the example with the Solver. I saw that example somewhere else but wasn't sure about how that worked. Your hip file cleared that up. Thanks!

[rayman]

Keep in mind that the solver wont compute the first frame, as by default Solve on creation frame is off.

 

You can also compute it with wrangles at once:

string param = "/obj/sphere/xform1/ty";
float startframe = 1;
float endframe = 240;
float step = 1;
float fps = 24;
float timestep = 1/fps;

float result = 0;

for(float i=startframe;i<=endframe;i+=step){
    float sample = ch(param,i*timestep);
    result += sample;
}

@result = result;

To emulate the behaviour of Solver SOP use :

float sample = ch(param,(i-1)*timestep);