1 3D Modelling with OpenGL Brian Farrimond Robina Hetherington

2 Schedule Week 7C programming 2D OpenGL Week 83D OpenGL Animation Interaction Week 9Colour, materials, lighting Using 3DSMax models Week 10Portfolio work

3 Today’s class Programming in C Using.NET Visual C++ Compiling + Linking = Building a program C programming with OpenGL Computer Graphics A first OpenGL program

4 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; }

5 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } /* and */ enclose comments which are ignored by the compiler

6 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } Include information about the standard library

7 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } A C function. Its name is main A C program consists of a collection of functions

8 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } A C function consists of: a header line a body made up of statements enclosed by { and }

9 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } header line body made up of statements

10 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } This is where the program actually starts.

11 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } Every C program has a main function

12 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } printf is a library function to print characters

13 Programming in C The “Hello world” program /* hello.cpp */ #include int main() { printf(“hello, world\n”); return 0; } Return from the main function – i.e. end the program

14.NET Visual C++ Microsoft’s C programming environment Program code is placed inside a.NET project.NET builds the program (or application) with this project We shall build a console application (as opposed to a Windows application)

15 Using.NET Copy the folder dotNetExamples\hello from the CD to your disc space Launch.NET Open the hello project using File | Open and navigate to hello.sln inside the hello folder

16 Exploring the hello project Solution tree

17 Exploring the hello project Solution tree Double click on hello.cpp to see the program code

18 Hello.cpp

19 Building the program To build the program, select the menu item Build | Build Solution Or use one of these two buttons

20 Running the program To run the program, select menu item Debug | Start Or use this button

21 Use of getchar() Without getchar() the program terminates at once before we can see what printf has done getchar() pauses the program until we press the return key.

22 Exercises Modify the text inside the printf statement Modify the program so that it prints out One Two Three

23 Building = Compiling + linking Building is a two stage process: –Compiling source code into object code –Linking object code and library code to produce the program (known as the executable)

24 More on Building See using dotNET IDE in C page 16

25 Separate compilation Large programs are made up of many source files Each file compiled separately Advantages: –Changing the code of one file does not require recompiling the entire program –Team of programmers can work on different files

26 Multifile example

27 The multifile.NET project Copy the folder dotNetExamples\multifile from the CD to your disc space Open the project using File | Open Examine the solution tree

28 The multifile.NET project Build and run the program Edit func2.cpp so that it prints out: This is the new func 2 Rebuild and rerun the program