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1. 每个material的id 最好用一个 64位 unsigned int 表示。当然如果你用 128位 unsigned int， 使用__mm128关键字， 也可以。这样可以相对减少排序复杂度。

2.  对于游戏里所有的texture和effect,最好分别有个 texture manager和effect manager, 对于相同的 texture和effect，给一个相同的 id： 分别是 texture id 和 effect id。 每个id是个8位的 byte就足够 了。同时支持256个effect和texture在内存中差不多是极限。

3. 关于material 的 id， 还需要包含物体的一些信息和到camera的距离，一般来说， 大概的定义如下：
union{
  struct {
    unsigned int    objectType       : 8;
    unsigned int    effectID         : 

Terrain Rendering:

http://www.gamedev.net/reference/articles/article1936.asp

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1. All resource needs to be carefully managed, the best way to do that is using IUnkown like interface. Every time a resource is acquired, the code increases the reference count internally, and the client releases the resource externally, which decrease the reference count.
2. Basic stuffs need to be thread safe, things like basic data structures: queue, link list, etc. and memory allocation functions. All lock-free algorithms are very good candidates but it’s very hard to get it correct; Anyway, it’s worth it. For the lock-free ABA problem, an iterator can be used to indicate an element is referenced by a client. When the iterator moves away ( ++ or -- ), or get deleted, the reference count of the element can be decreased. This provides good way to m

Illustration & Sculpture

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