Change particle mass via script

[leonrdo]

Using ObiRope 3.3, I'm trying to change the mass of a single particle via script following the tutorial http://obi.virtualmethodstudio.com/tutor...icles.html
but its not working the way I think is supposed to work.
For example, calling this code, after a key is pressed,

Code:

float[] mass = new float[1];
mass[0] = 0.0f;
Oni.SetParticleInverseMasses(rope.Solver.OniSolver, mass, 1, rope.particleIndices[1]);

its not keeping the second particle fixed, as I supposed it would make.
Did I miss anything?

Thanks in advance