UG二次开发曲面UV扩展

新手学做一个曲面剪切实体的功能，求教UF_MODL_create_enlarge的用法，请高手详解，我想先将曲面扩展，在剪切掉扩展曲面一边的实体

高手快来吧！ 1# guoling167

这是 ugdoc内的，看看应该可以做了
int UF_MODL_create_enlarge
(

tag_t face
int type
char * percent_size [ 4 ]
double tolerance
tag_t * feat_obj_tag

)

tag_t face Input tag of the base face of the enlarged sheet
int type Input enlarge extension type: 0-linear extension; 1-natural extension
char * percent_size [ 4 ]  Input Array of the percent increase for the surface parameters. These are character
pointers to allow for input expressions.
For linear type extensions, the range is from [0, 100], with 0 meaning no increase,
and 100 meaning a 100% increase.
For natural type extensions, the range is from [-99, +100], with -99 meaning a 99%
decrease or shrinkage of the surface, and +100 meaning a 100% increase.

percent_size[0] is the percent for U-min
percent_size[1] is the percent for U-max
percent_size[2] is the percent for V-min
percent_size[3] is the percent for V-max
double tolerance Input Distance tolerance for approximations.
tag_t * feat_obj_tag Output tag of the feature record of the enlarged sheet

感谢楼上的函数详细解释，现在遇到一个问题，这个用了后没一点反应，也不扩大，也不报错，将实体的平面萃取出来后（UF_MODL_extract_face），换成片体的tag报错，貌似enlarge函数只能扩大实体的face.还请高手详解，另外请问还有别的方法么，比如先萃取face成片体，然后延伸片体，在缝合，请用过的前辈指点一下。

现在已经解决了，是我太急切了，看来路漫漫其修远兮，谢谢大家

你好，我遇到你曾经遇到的问题，这个用了后没一点反应，也不扩大，也不报错，我想问下你是怎么解决的？