dxfer_direction：用于确定数据传输的方向；常常使用以下值之一。
Dxfer_direction: Used for data transfer direction; could be one of the following values.
在计算任意方向的模值时，提出了使用加权平均的方法。
The method of weighted average is given to calculate the modulus on every direction.
奇异方向是值分布论中研究的重要内容之一。
Singular direction is one of the important parts of the value-distributed theory.
目的：研究不同方向光源对数码色度值的影响。
Objective: To study the effect of light from different direction on digital chromatic value.
值朝向天空方向，与地面垂直相交。
Z points toward the sky and is perpendicular to the ground plane.
值朝向天空方向，与地面垂直相交。
Z points toward the sky and is perpendicular to the ground plane.
应用推荐