运用分形原理用OpenGL画的雪花，就是在一个线段的三分之一处，分出两个为原来线段的1/3的线段，并和短的一段成60度（在一个平面内），然后再对新分出的两个线段和原线段的三分之一重复上述操作，大约4层以后，就像一个雪花了:-)。-Principle of the use of fractal snowflakes with OpenGL painting is one-third of a line segment, the separation of the two original segments of the 1/3 of the segment, and into a short period and 60 degrees (in a plane), and then the new separation of the two segments and one-third of the original segment to repeat the above operation, after about 4 layers, like a snowflake has :-).