Function xVec3Hdng

src/SB/Core/x/xMovePoint.cpp:178–211

}

inline F32 xVec3Hdng(xVec3* a, const xVec3* b, const xVec3* c)
{
    F32 dx = c->x - b->x;
    F32 dy = c->y - b->y;
    F32 dz = c->z - b->z;
    F32 len2 = dx * dx + dy * dy + dz * dz;
    F32 len, invLen, ret;

    if (xeq(len2, 1.0f, 0.00001f))
    {
        a->x = dx;
        a->y = dy;
        a->z = dz;
        ret = 1.0f;
    }
    else if (xeq(len2, 0.0f, 0.00001f))
    {
        a->x = 0.0f;
        a->y = 1.0f;
        a->z = 0.0f;
        ret = 0.0f;
    }
    else
    {
        len = xsqrt(len2);
        invLen = 1.0f / len;
        a->x = dx * invLen;
        a->y = dy * invLen;
        a->z = dz * invLen;
        ret = len;
    }

    return ret;
}