最终渲染阶段产生最后渲染后的图像，到这一步，所有的对象都将被再次渲染，其中着色器将混合前一步生成的光源和纹理以及所有自发光照明。

Final pass produces final rendered image. Here all objects are rendered again; with shaders that fetch the lighting, combine it with textures and add any emissive lighting.

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解决这个问题的第一个办法是是改变深度。这个深度由像素着色器根据储存在粒子纹理中的深度生成。

The first approach to dealing with this is to perturb the depth being output from the pixel shader by a depth stored in the particle texture.

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写详细的程序使用纹理着色器，位移，模式生成和自定义反射模型。

Write detailed procedural shaders using texture, displacement, pattern generation, and custom reflection models.

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