1 3d modelling with opengl brian farrimond robina hetherington
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3D Modelling with OpenGL
Brian Farrimond
Robina Hetherington
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ScheduleWeek 7 C programming
2D OpenGL
Week 8 3D OpenGL
Animation
Interaction
Week 9 Colour, materials, lighting
Using 3DSMax models
Week 10 Portfolio work
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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
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
/* and */ enclosecomments which are ignored by the compiler
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
Include information about the standard library
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
A C function.Its name is main
A C program consists of a collection of
functions
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
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 }
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
header line
body made up of statements
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
This is where the program actually starts.
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
Every C program has a main function
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
printf is a library function to print characters
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Programming in C
The “Hello world” program
/* hello.cpp */
#include <stdio.h>
int main()
{
printf(“hello, world\n”);
return 0;
}
Return from the main function – i.e. end the program
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.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)
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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
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Exploring the hello project
• Solution tree
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Exploring the hello project
• Solution tree
• Double click on hello.cpp to see the program code
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Hello.cpp
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Building the program
• To build the program, select the menu item
Build | Build Solution
Or use one of these two buttons
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Running the program
• To run the program, select menu item
Debug | Start
Or use this button
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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.
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Exercises
• Modify the text inside the printf statement
• Modify the program so that it prints outOne
Two
Three
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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)
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More on Building
• See using dotNET IDE in C page 16
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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
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Multifile example
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The multifile .NET project
• Copy the folderdotNetExamples\multifile
from the CD to your disc space
• Open the project usingFile | Open
• Examine the solution tree
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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
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