void Update()
{
//every 10 frame update once
if (m_Camera == null || m_Root == null || !m_Camera.enabled || !m_Dirty)
{
return;
}
m_Dirty = false;
Plane[] planes = GeometryUtility.CalculateFrustumPlanes(m_Camera);//视景平面 得到摄像机视锥
mVisiblePatches.Reset();
//transform 为玩家中心点
m_Root.GetVisibleMesh(planes, transform.position, lodPolicy, mVisiblePatches);
m_PatchesFlipBuffer.Clear();
for (int i = 0; i < mVisiblePatches.Length; ++i)
{
uint pId = mVisiblePatches.Data[i];
if (m_ActivePatches.ContainsKey(pId))
{
m_PatchesFlipBuffer.Add(pId, m_ActivePatches[pId]);
m_ActivePatches.Remove(pId);
}
else
{
//new patches
Mesh m = GetMesh(pId);
if (m != null)
{
MTPatch patch = MTPatch.Pop(m_Header.RuntimeMats);
patch.gameObject.transform.SetParent(m_Go.transform);
patch.Reset(pId, m);
m_PatchesFlipBuffer.Add(pId, patch);
}
}
}
Dictionary <uint, MTPatch> .Enumerator iPatch = m_ActivePatches.GetEnumerator();
while (iPatch.MoveNext())
{
MTPatch.Push(iPatch.Current.Value);
}
m_ActivePatches.Clear();
Dictionary <uint, MTPatch> temp = m_PatchesFlipBuffer;
m_PatchesFlipBuffer = m_ActivePatches;
m_ActivePatches = temp;
}
