锥截体 meaning in English

cone-frustum body

To understand this , we must first take a brief look at the characteristics of the viewing frustum
要理解这点，我们首先必须简要了解一下试图锥截体的特征。
Since we have split the frustum into two halves , each triangle has an angle at the origin of view equal to fov / 2
因为将锥截体分成相等两部分，每个三角形在原视图中都有一个角等于fov / 2 。
Screen coordinates are expressed in number of pixels , while coordinates in the frustum are normalized to a range of - 1 . 0 to 1 . 0
视图锥截体的原点( 0 , 0 )在屏幕中心，而屏幕坐标的则在屏幕的左上角。
The viewing frustum has an origin ( 0 , 0 ) at the center of the screen , while screen coordinates have an origin at the upper left of the screen
视图锥截体的原点( 0 , 0 )在屏幕中心，而屏幕坐标的则在屏幕的左上角。
Since we defined the frustum , we know the angle at which the sides of the frustum meet - this is the field of view we used to create the projection matrix in the first place
确定好锥截体，我们就知道锥截体顶角的大小?这是我们在第一个地方用来创建投影矩阵的视场。