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/* distance v1 to line-piece v2-v3 in 3D */float PdistVL3Dfl(float *v1, float *v2, float *v3){    float lambda, cp[3], len;    lambda= lambda_cp_line_ex(v1, v2, v3, cp);    if(lambda <= 0.0f)        return VecLenf(v1, v2);    else if(lambda >= 1.0f)        return VecLenf(v1, v3);    else        return VecLenf(v1, cp);}