Find the cosine of the Angle between the vertex normal and the newly calculated vertex to light normal.
确定顶点法线与重新计算顶点后得到的光照法线之间的角度的余弦。
The vertex normal is usually calculated as the average between the triangle normals of all triangles that include that vertex.
顶点的法向量通常是包含这个顶点的所有三角形法向量的平均值。
This algorithm considers the polygon vertex normal predigesting rule as a basic gist. On the precondition of assuring terrain effect, it can predigest models in large extent.
这种算法以多边形顶点法矢最简化准则为基本依据，能在保证地形视觉效果的前提下，对模型进行大幅度简化。
This algorithm considers the polygon vertex normal predigesting rule as a basic gist. On the precondition of assuring terrain effect, it can predigest models in large extent.
这种算法以多边形顶点法矢最简化准则为基本依据，能在保证地形视觉效果的前提下，对模型进行大幅度简化。
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