An interactive Stereographic Projection of 4-dimensional sphere 3-sphere based on OpenGL
4维球体（3维球面）的球极投影程序。
- S3GL01:
Simple, incomplete version.
预览版本。 - S3GLCV01:
A complete version using 4D rotation matrix.
使用了旋转矩阵的版本。 - S3GLCVLR01:
3D side by side version. OpenGL part of codes are in S3GLCV01 folder.
可切换左右眼3D模式。GL部分代码在S3GLCV01文件夹内。
W-S, A-D, Q-E, 1-2, 3-4, 5-6: 4D rotation 四维旋转
Backspace: Reset 4D rotation 还原四维旋转
Z, X, C: Show/Hide meridians, hypermeridians and parallels 显示、隐藏各组经纬线
F-R: Change distance of viewpoint 调整视点距离
T-G: Change view angle 调整视角大小
V-B: Move 4D projection point, from Stereographic Projection to Direct Projection. Press P to reset to Stereographic Projection. 调整四维投影点距离，最小为球极投影，最大为正投影。按P键重置。
J-K: Change divsional angle. The amount of meridians, hypermeridians and parallels will also be changed. 调整分割角，即各组经纬线内的角度，同时会改变经纬线的数量。
N-M: Change multiplier (A bigger multiplier makes the circles rounder) 调整乘数因子使多边形更接近圆
Comma-Period: Change thickness 调整粗细
Square Brackets: Adjust Pupil Distance in 3D mode 调整3D模式的瞳距
Slash or Question Mark: Enable, disable 3D mode 3D模式开关
