/// <summary>
/// use prev data to calculate current up dir
/// </summary>
private Vector3 _CalcUp(float t, Vector3 prevTan, Vector3 currTan, ref Vector3 prevBaseUp)
{
Vector3 currUp = Vector3.zero;
switch (m_twistMtd)
{
case ETwistMethod.YUp:
{
Vector3 bino = Vector3.Cross(Vector3.up, currTan);
currUp = Vector3.Cross(currTan, bino).normalized;
}
break;
case ETwistMethod.Minimum:
{
Vector3 prevBino = Vector3.Cross(prevBaseUp, prevTan);
currUp = Vector3.Cross(currTan, prevBino).normalized;
}
break;
default:
Dbg.LogErr("CatmullRomUniform._CalcUp: unexpected twistMtd: {0}", m_twistMtd); break;
}
if (currUp == Vector3.zero)
{
currUp = prevBaseUp;
}
prevBaseUp = currUp;
currUp = ConUtil.ApplyTiltToUp(m_points, t, ref currTan, ref currUp);
return(currUp);
}
/// <summary>
/// * calculate BigT for mapping t to segment
/// * calculate the length of curve
/// * extra: calculate smaller segments for editor to draw
/// </summary>
private void _Recalc()
{
m_dirty = false;
m_length = 0;
m_BigT = 0;
m_pointTpos.Clear();
// calculate bigT & pointTpos list
m_pointTpos.Add(0);
for (int i = 1; i < m_points.Count; ++i)
{
Vector3 p0 = m_points[i - 1].pos;
Vector3 p1 = m_points[i].pos;
m_BigT += Mathf.Sqrt((p1 - p0).magnitude);
m_pointTpos.Add(m_BigT);
}
// calculate length of curve
Vector3 prevPt = m_points[0].pos;
Vector3 prevTan = Tangent(0);
Vector3 prevBaseUp = (prevTan == Vector3.up) ? Vector3.back : Vector3.Cross(prevTan, Vector3.Cross(Vector3.up, prevTan)).normalized;
#if UNITY_EDITOR
m_interPts.Clear();
m_interPts.Add(prevPt);
m_interTangents.Clear();
m_interTangents.Add(prevTan);
#endif
m_interUps.Clear();
m_interUps.Add(ConUtil.ApplyTiltToUp(m_points, 0, ref prevTan, ref prevBaseUp));
int SmoothAmount = (PointCount - 1) * m_ptsPerSeg;
for (int i = 1; i <= SmoothAmount; i++)
{
float pm = (float)i / SmoothAmount;
Vector3 currPt = Interp(pm);
m_length += Vector3.Distance(prevPt, currPt);
Vector3 currTan = Tangent(pm);
Vector3 up = _CalcUp(pm, prevTan, currTan, ref prevBaseUp);
m_interUps.Add(up);
#if UNITY_EDITOR
m_interPts.Add(currPt);
m_interTangents.Add(currTan);
#endif
prevPt = currPt;
prevTan = currTan;
}
}
/// <summary>
/// calculate the length of curve
/// </summary>
private void _RecalcLen()
{
m_length = 0;
Vector3 prevPt = m_points[0].pos;
Vector3 prevTan = Tangent(0);
Vector3 prevBaseUp = (prevTan == Vector3.up) ? Vector3.back : Vector3.Cross(prevTan, Vector3.Cross(Vector3.up, prevTan)).normalized;
#if UNITY_EDITOR
m_interPts.Clear();
m_interPts.Add(prevPt);
m_interTangents.Clear();
m_interTangents.Add(prevTan);
#endif
m_interUps.Clear();
m_interUps.Add(ConUtil.ApplyTiltToUp(m_points, 0, ref prevTan, ref prevBaseUp));
int SmoothAmount = (PointCount - 1) * m_ptsPerSeg;
for (int i = 1; i <= SmoothAmount; i++)
{
float pm = (float)i / SmoothAmount;
Vector3 currPt = Interp(pm);
m_length += Vector3.Distance(prevPt, currPt);
Vector3 currTan = Tangent(pm);
Vector3 up = _CalcUp(pm, prevTan, currTan, ref prevBaseUp);
m_interUps.Add(up);
#if UNITY_EDITOR
m_interPts.Add(currPt);
m_interTangents.Add(currTan);
#endif
prevPt = currPt;
//prevBaseUp = up; //prevBaseUp is updated in _CalcUp
prevTan = currTan;
}
m_dirty = false;
}