[ REQ 5420]:

[guawu at enuxsa.eas.asu.edu]

Hi, there:
	I am trying to understand how ginsu works. Though I think I 
understand most of it, I still have some puzzles unsolved. Here I am 
asking for some help from you. I am working on a program that needs 
'cutting' function. It is very important for me to understand how ginsu 
works. Your response of your earliest convenience is greatly appreciated.

	1. if I understand it right. the update_transform(int skip) (l:67 
in ginsu.C) function will inquires geomview about the transform of clip 
plane and then update the equation for the clip plane used by ginsu WHEN 
skip=1 or nonzero. Am I right?
	I don't understand what it will do when skip =0. And 
update_transform(0) is called in the following lines in ginsu.C:
		l:226,227(why twice?)314
	Is it true that when skip =0, the geomview will not write the 
transorm info to ginsu, and hence the T[][] matrix in update_transform 
will be invalid...? This is where I get lost. Maybe I am wrong, so please 
tell me what I misunderstand.

	2. Any particular reason why not to use the callback functions in 
forms library so that fl_check_forms() will handle all the events for you?

	3. What is the meaning and function of the global variable 
'resworld' in ginsu.C? (referenced @ l:19, 122, 123, 125).

	4. What is the meaning of local variable 'updat_count' in main() 
in file ginsu.C? (referenced @ line:170,229, 310,312,315.

	Thank you very much. I am looking forward to your reply. It has 
been very helpful to me. Have a nice holiday.


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