The cofocal ellipse and hyperbola of spherical surface will also be projected into the cofocal ellipse and hyperbola in gnomonicprojection.
球面上共焦点之椭圆、双曲线，在球心投影中仍投影成共焦椭圆、双曲线。
2
According to the principle of V. Goldschmidt 's gnomonicprojection and crystal computer graphics, a new system of computer graphics of crystal shape is presented in the paper.
根据极平投影作晶体图和计算机绘图原理，本文建立了一种新的晶体形态计算机绘图系统。
3
An approach is first posed by using gnomonicprojection, based on the problem remaining unresolved, which is about the coating joint modeling and the joint overlap of spherical equilateral polygon.