Motion fx viewer - will show channels

Import CHOP data

To importm data from chops

SOP node

channel node - (like material)

SOP function

chop("../chopnet1/null/chan1") - Sops expression to import CHOPnet channel
chopcf("", 0, $F, ) - Sop expression with channel by number and time

CHOP Export

orange flag: export chop node to export
Activate will override SOP channel

Op: expresion

nodes may have a parameter which expects a file name of a file containing a specific type of data. In these types of parameters you can usually use op:/path/to/node instead of a file name to grab data from live nodes in the scene hierarchy instead of from a file.

op:/geo1/volume1 - instead of a file name to grab data from live nodes using full path
op:`opfullpath('../../volume1')` - work around this by converting a relative path to an absolute path using the opfullpath

Nodes

base

Wave, Noise

post

limit - clamp
envelope - smooth

Vex

import vis

 float t, s;
 string path;

 t = @Time * 44100; // 44khz, the sample rate of the audio
 path = chs('path');

 s = chop(path, 'chan0', t);

 @P.y += s * ch('amp');

quantise a value to steps, with variable smoothness: by matte:

float smoothstep(float n; float x) {
    if (n == 0) return x;
    return 1.0/(1.0+pow(1.0/x-1.0,n) );
}

vector smoothstep(float n; vector x) {
    if (n == 0) return x;
    vector un = {1,1,1};
    return un/(un+pow(un/x-un,n) );
}

// step: levels of quantisation
// val: value to quantise
// rolloff: smoothness

val *= step;
vector fraction = smoothstep(rolloff, frac(val));
val = floor(val) + fraction;
val /= step;