private unsafe static extern void SDTFriction_setNoisiness(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setDissipation(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setViscosity(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setDynamicCoefficient(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setBreakAway(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setNormalForce(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_setStribeckVelocity(SDTInteractor *x, double f);
private unsafe static extern void SDTImpact_setShape(SDTInteractor *x, double f);
private unsafe static extern void SDTFriction_free(SDTInteractor *x);
private unsafe static extern void SDTImpact_free(SDTInteractor *x);
private unsafe static extern void SDTImpact_setStiffness(SDTInteractor *x, double f);
private unsafe static extern void SDTInteractor_dsp(SDTInteractor *x, double f0, double v0, double s0, double f1, double v1, double s1, double *outs);
private unsafe static extern double SDTInteractor_computeForce(SDTInteractor *x);
private unsafe static extern void SDTInteractor_setSecondPoint(SDTInteractor *x, long l);
private unsafe static extern void SDTInteractor_setFirstPoint(SDTInteractor *x, long l);
private unsafe static extern void SDTInteractor_setSecondResonator(SDTInteractor *x, SDTResonator *p);