由画法几何原理可知平面面积等于其正投影面积乘以该平面与投影面夹角的余弦。
According to principle of descriptive geometry, the area of plane equals projection of the plane divided by cosine between plane and projection of plane.
为了研究两平面相交可见性的规律，从空间一个平面的投影特点入手，将平面分别设定为正面、背面两面，讨论平面图形各顶点投影顺序与平面正面、背面的投影所具有的内在规律。
To study the intersection visibility of two general place planes, this paper set the planes as two faces of front and backs from the point of projection character of a space plane.
该方法以投影为基础，以平高分解为手段，通过在多个投影平面内逐步确定平面、高程信息实现特征线提取及模型重建。
This study proposed an algorithm for building model reconstruction from airborne laser scanning data, based on feature line detection and separation of planimetric and height computations.
基于球极投影保持PH性质这一特性，通过球极投影把球面数据投影到平面上，构造一条平面PH曲线。
Based on the stereographic projection that preserves Pythagorean-Hodographs, a spherical rational ph curve is constructed to solve this problem.
两平面交线课件主要功能用于求解各种位置两平面交线的端点、绘制两平面交线的正等轴测投影和三面投影。
This courseware is used for finding the position of the endpoint of two intersecting triangles and drawing the surfaces, the isometric projection of the intersecting line and three-plane projection.
两平面交线课件主要功能用于求解各种位置两平面交线的端点、绘制两平面交线的正等轴测投影和三面投影。
This courseware is used for finding the position of the endpoint of two intersecting triangles and drawing the surfaces, the isometric projection of the intersecting line and three-plane projection.
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