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1.虚幻2 静态模型上的Projector会切割静态模型并生成Primitive decals，最后的Primitive Decals以三角形List形式渲染，为什么不使用Strip？因为他切割的原理。
2.静态模型切割原理。详见ClipTriangle函数，基本算法是，生成一个切割顶点顺序序列，切割过程中，如果前序顶点与测试顶点都位于投影空间外，则丢弃本测试顶点。如果分别置于内外，则切割生成新顶点，按顺序保存下顶点，等所有顶点都生成完毕后，以其中一个顶点为原点，分割生成Triangle List。
3.其Projector投影矩阵的推导。
| Sx     0       0     0 |
| 0       Sy     0     0 |
| 0.5    0.5    1     0 |
| 0       0       0     1 |

Sx = Sy = 0.5 / tan(Θ)

Θ = Half Horizonal FOV Radius

X'/tan(Θ) = X''/0.5 ( Distance of Near Plane is 1, So Half Length of FOV is tan(Θ) )
上式主要是进行投影坐标钳制(-0.5 - +0.5)，而| 0.5 0.5 1 0 |主要是将钳制范围平移为| 0 - 1.0 | 的纹理坐标范围。


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