Default tolerance too low; setParameter function may be useful

[micuat]

While trying the oF example, I noticed the default tolerance is too low to identify a gesture. I tried

void ofApp::setup(){
...
    // PARAMETERS are set by default
    parameters.numberParticles      = 2000;         // can be less for low CPU resources
    parameters.tolerance            = 5.f;         // set auto
    parameters.resamplingThreshold  = 500;          // 1/4 of the number of particles
    parameters.distribution         = 0.0f;         // non zero if T-distribution
    parameters.phaseVariance        = 0.000001;     // magic number
    parameters.speedVariance        = 0.001;        // magic number
    parameters.scaleVariance = vector<float>(1, 0.00001); // TODO: Check that default works like this.
    parameters.rotationVariance = vector<float>(1, 0.00001);

    // CREATE the corresponding GVF
    gvf.setup(config, parameters);
...

and it seems good enough for recognition.

Another thing is that the above code is too long so that can it be simply done by gvf.setTolerance(float) kind of function? I haven't thoroughly read the code so I'm not sure if individually changing parameters will cause problems or not.

[bcaramiaux]

Hi micuat,

The value of the tolerance depends on the range of data. For instance, if the incoming data values are between 0.0 and 1.0, atypical tolerance value is 0.2 (20% of the range).

Regarding the code highlighted, I let it like that in order to see the different parameters that can be changed. Indeed there is a function:
void setTolerance(float tolerance); in ofxGVF.h

[micuat]

I missed that function 👍
The only issue is setTolerance(float) must be called after setup(ofxGVFConfig) otherwise overwritten by default, which I think is counterintuitive to oF standard