现在，视差贴图是专门术语。
视差贴图同样使用了这样的切线空间的概念。
Parallax mapping USES the concept of tangent space in the same manner.
视差贴图是一种计算开销不大的，近似2d效果。
Parallax mapping is a computationally inexpensive, approximate 2d effect that.
现在，让我们通过几幅截图来演示下视差贴图的作用有限的原因。
Now, let's demonstrate why parallax mapping is useless in practise with a few pictures.
不一般的视差贴图，要集合良好的演示技术，特定布景，对象纹理和观察视角。
It is one of those techniques that look good in tech demos, papers with specific scenes, textures and viewpoints... but not in general.
视差贴图技术的过程有以下要求：对每个像素都做处理中，一个贴图坐标能被多张贴图使用，并且能做一些偏移。
The process of parallax mapping requires that, for each pixel drawn, a texture coordinate, used to index one or more texture maps, be corrected by some displacement.
视差，高度，细分或环境遮蔽贴图将被转换到R8格式。
Parallax, height, tessellation or ambient occlusion maps will be converted into R8 format.
这样的简化可以让贴图在低视角的时候看起来比较好，但是这也会也减少视差效果，不过这并不像它听起来这么糟。
This simplification keeps textures looking good at shallow angles, but it also reduces the parallax effect, which isn't as bad as it sounds.
这样的简化可以让贴图在低视角的时候看起来比较好，但是这也会也减少视差效果，不过这并不像它听起来这么糟。
This simplification keeps textures looking good at shallow angles, but it also reduces the parallax effect, which isn't as bad as it sounds.
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