Function ArcEvalIterate

src/SB/Core/x/xSpline.cpp:496–606

}

F32 ArcEvalIterate(xSpline3* spl, F32 s, U32 deriv, xVec3* o, U32 iterations)
{
    xCoef3* coef;
    xCoef3 tempCoef;

    U32 seg;
    S32 min;
    S32 max;
    S32 test;
    S32 segmul;

    F32 utest;
    F32 arctest;
    F32 umin;
    F32 umax;
    F32 smin;
    F32 smax;
    F32 arclengthmax;

    min = -1;
    max = spl->arcSample * spl->N - 1;
    if (max != 0)
    {
        while (min + 1 != max)
        {
            test = min + max >> 1;
            segmul = test;
            if (s <= spl->arcLength[test])
            {
                segmul = min;
                max = test;
            }
            min = segmul;
        }
    }

    seg = max / spl->arcSample;
    min = seg * spl->arcSample;
    umin = (F32)(max - min) / (F32)spl->arcSample;
    umax = (F32)((max + 1) - min) / (F32)spl->arcSample;
    if (max > 1)
    {
        smax = spl->arcLength[max - 1];
    }
    else
    {
        smax = 0.0;
    }

    arclengthmax = spl->arcLength[max];
    if (min - 1 > 0)
    {
        smin = spl->arcLength[min - 1];
    }
    else
    {
        smin = 0.0;
    }