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3D models in computers are classified based on geometric characteristics. They can be divided into three types: box models, surface models, and solid models. If an object is classified by the method of representation, the entity model can be divided into three categories: Decomposition representation, constructive solid geometry, and boundary representation.Common decomposition methods include: quadtree, octotree, multi-tree, BSP Tree, and so on.M
Construction entity geometry CSG full name constructive solid geometry, is a common technique for building models in 3D computer graphics, which combines the logical operations of the three collection of union, subtract subtraction, and intersect intersction to convert the cube , cylinder, and prisms are simple basic models that are nested together into more complex three-dimensional models.CSG's algorithm has been implemented in various language plat
3D models in computers are classified based on geometric characteristics. They can be divided into three types: box models, surface models, and solid models. If an object is classified by the method of representation, the entity model can be divided into three categories: Decomposition representation, constructive solid geometry, and boundary representation. Common decomposition methods include: quadtree, octotree, multi-tree, BSP Tree, and so on.
Main Methods for constructing representation: sc
Construction entity geometry CSG full name constructive solid geometry, is a common technique for building models in 3D computer graphics, which combines the logical operations of the three collection of union, subtract subtraction, and intersect intersction to convert the cube , cylinder, and prisms are simple basic models that are nested together into more complex three-dimensional models. CSG's algorithm has been implemented in various language pla
Construction entity geometry CSG full name constructive solid geometry, is a common technique for building models in 3D computer graphics, which combines the logical operations of the three collection of union, subtract subtraction, and intersect intersction to convert the cube , cylinder, and prisms are simple basic models that are nested together into more complex three-dimensional models.CSG's algorithm has been implemented in various language plat
"Plated Careers" in ancient times refers to the emperor to eat bowls, folk rumors, can get plated careers, life and clothing without worry. In modern times, "plated careers" has become a food to eat the other said, often some people say, XXX in the national unit to work, like holding a plated careers, not worry about l
When programmers change careers to do sales [original: http://www.cnblogs.com/WinYoung/archive/2008/04/10/programmersales.html]
In my last essay, published a number of regrets, put a good programmer do not do, career change to do the sale, did not expect, have several friends to my message, discuss how to change to do sales. Here I would like to talk about my own ideas, but also to some of the more successful predecessors to learn some experience.
I t
also make use of the insert all into ... Select to first build a table test_tb_grade3:SQL code:1 CREATE TABLE Test_tb_grade32 (3 user_name VARCHAR2 (CHAR),4 COURSE VARCHAR2 (CHAR),5 Score FLOAT6)Then execute the following sql:SQL code:1 Insert All2 into Test_tb_grade3 (User_name,course,score) VALUES (user_name, ' languages ', Cn_score)3 into Test_tb_grade3 (User_name,course,score) VALUES (user_name, ' math ', Math_score)4 into Test_tb_grade3 (User_name,course,score) VALUES (user_name, ' English
Original table:1. A career change is to turn a column of data into a row display, and a column switch uses the sum aggregation function, and when the case is judged, the column change needs to define its own alias.Column Change statement:SELECT SUM (caseWhen t.loc = ' NEW YORK ' thenT.deptnoEND) as column_00001,SUM (caseWhen t.loc = ' DALLAS ' ThenT.deptnoEND) as column_00002,SUM (caseWhen t.loc = ' CHICAGO ' ThenT.deptnoEND) as column_00003,SUM (caseWhen t.loc = ' BOSTON ' ThenT.deptnoEND) as c
very important, to both speaking and writing. To try to read the original book, because the foreigner to write technical books is afraid that they do not speak clearly, for fear you do not understand, so speak very thin or even a bit verbose; Chinese people write books, like teaching martial arts donuts, not to see your understanding and their efforts to the extent, the master led the door, then no matter.4, learn a language and learn to play the same thing, through more practice to the unfamil
consider factors such as the ability, performance, and growth of team members.There are many books on the market for planning and management, which are worth reading. Although the theory of optimization is a technical book, it is the theoretical basis of planning, so you might as well look at a bit more. Starting from self-planning, learning more about other people's planning is also an important means to improve planning ability.SummarizeThis article systematically expounds the principles of l
))) asAnalyst $ fromEMP - GROUP byJob -
the); A simplified version of the example above: 1 /*
2 1. First use decode () to perform row-to-column detection of basic data as a table!;;3 The 2.B table summarizes the data in table A and merges it;4 */
5 withA as (
6 SELECT
7To_char (DEPTNO) asDeptno,8 SUM(DECODE (Job,'ANALYST', Sal,0)) asANALYST,9 SUM(DECODE (Job,'Clerk', Sal,0)) asClerk,Ten SUM(DECODE (Job,'MANAGER', Sal,0)) asMANAGER, One SUM(DECODE (Job,'President
1 ' team, ' Men ' item,80 CENT UNION SELECT 1 as ID, ' Test team 1 ' team, ' women ' item,20 CENT Union Select 2 as ID, ' Test Team 2 ' team, ' Men ' item,30 CENT Union Select 2 as ID, ' Test Teams 2 ' team, ' women ' item,70 CENT) SELECT * from-T PIVOT (SUM (CENT) for ITEM in ([Men],[women])) A2.3, using the aggregation function to implementWith TAS ( select 1 as ID, ' Test team 1 ' team, ' Men ' item,80 CENT UNION SELECT 1 as ID, ' Test team 1 ' team, ' women ' item,20 CENT Uni
Programmers have been a high salary to enjoy the envy of the occupation, but with the continuous progress of science and technology, the process of development into a person can be involved in the industry, as long as the short-term training, you can become a primary program designers, the past high pay Halo has gradually receded, More thinking began to turn to the programmer's survival problem. Huge work pressure and boring code, so that more and more of the original program is not interested i
possible to control, should not control the best advice, whether right or wrong, regardless of success or failure, for you, is the accumulation of experience.The fourth step, dare to take responsibility, regardless of the outcome of the matter will fail. A person who has the courage to take responsibility for failure is more respectable. And, if you fail, you will lose much, the biggest is just to leave.Second, attack the hearts of othersWhether it is on the right or the next, should be prudent
Reason:1, do not want to do now so-called test, there is no technical content, although the work of leisure, Unit life is very bright, but the feeling will eventually hurt themselves.2, a while ago has been looking at Delphi, but to find sub-development work, Delphi or not, the future direction is certainly cross-platform, network interconnection, big data, cloud platform and so on.3, asked some college students (most of them are development), high school classmates (two or three good relations,
In fact, the outside world to the programmer to add a lot of tags, or the programmer self-deprecating ridicule added.In fact, no matter how the outside view of the programmer's job, I feel very proud of. "It's good to be a programmer!" ”You have to respect your career by making others respect your career. In this era of the Internet, if not our thousands of programmers in the background struggle,How to give everyone a wonderful internet world, in fact, our work is quite meaningful.Though you ear
By Anthony
Balderrama, CareerBuilder.com writer
Celebrity blogs and magazines are plastered with pictures of high-profile actors, athletes and business leaders, so you might think thatThese occupations are your only route to wealth.
If you want to make several million dollars for a few months 'work, then,Yes, you probably shocould star in a Hollywood blockbuster. But if you're re lookingFor careers to lead you to financial success, remember to put e
, give you a grudge, it is more miserable, the consequences, it is difficult to predict.
It's different to be a salesman, you have to think about these things, do customers often care whether the competitor to rob a single, partners have any other action, the customer should always be careful to speak, pay attention to every detail, know how to look at the color, do not want every word is so pleasant, but must not offend customers, Otherwise, customers want to talk to others about the contract,
consequences, it is difficult to predict.It's different to be a salesman, you have to think about these things, do customers often care whether the competitor to rob a single, partners have any other action, the customer should always be careful to speak, pay attention to every detail, know how to look at the color, do not want every word is so pleasant, but must not offend customers, Otherwise, customers want to talk to others about the contract, you still cheerfully in the dark, every day to
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