The paper discusses also how to master rapidly its charting and chart reading based on the firstAngleprojection.
阐述了在学会第一角投影法的基础上,如何迅速地掌握第三角投影的画图和看图方法。
2
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.