1. Window reshaping, Keyboard interaction, Camera, Drawing objects
OpenGL & GLUT Basics
Window reshaping, Keyboard interaction, Camera, Drawing objects
George Georgiev
Telerik Corporation

2. Table of Contents Project using OpenGL & FreeGLUT in MSVC++
Window reshaping
Keyboard Interaction
Camera
Positioning, orientation
Drawing objects
Coloring
Basic Lighting

3. Project using OpenGL & FreeGLut
A reminder…

4. OpenGL & FreeGLUT Project
Step 1 – Creating the project
Setup OpenGL & FreeGLUT (done only once)
Open Visual Studio, Choose C++ as a language
Create a Win32 Console application
Tick “Empty project”
Add a new .cpp file
#include <gl\glew.h>
#include <gl\freeglut.h>
int main(int argc, char ** argv)

5. OpenGL & FreeGLUT Project (2)
Step 2 - Linking
Go to Project > [YourProjectName] Properties
From the side menu choose Configuration properties > Linker > Input
In the Additional Dependencies type in: glew32.lib freeglut.lib
Do this for both Debug and Release configurations (upper left corner in the window)
Close the properties window, you’re ready to go

6. OpenGL & FreeGLUT Project (2)
Tip – the faster way to link to the libraries
Skip the entire Step 2
In the .cpp file write:
#pragma comment (lib, “glew32.lib”) #pragma comment (lib, “freeglut.lib”)

7. Window reshaping
The Reshape function

8. Window reshaping Reshape function Specified by glutReshapeFunc
Defines how your window reshapes
Write it once, remember it no more

9. Window reshaping Live Demo *
(c) 2008 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

10. The Keyboard monitoring functions
Keyboard interaction
The Keyboard monitoring functions

11. Keyboard interaction Keyboard monitoring functions Specified by
glutKeyboardFunc
glutKeyboardUpFunc
Monitor key pressing and key releasing
Doesn’t receive device information
Receives translated windows messages

12. Keyboard interaction Live Demo *
(c) 2008 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

13. Orientation and positioning
Camera control
Orientation and positioning

14. Camera control ‘Moving the world’ method Using the gluLookAt function
Using the glTranslate* and glRotate* functions
You do the things the opposite way around
F. e., to move the camera forward, move the objects backward
Using the gluLookAt function
Specifies
camera location
Viewed location

15. GLUT predefined objects, Coloring, Positioning
Drawing objects
GLUT predefined objects, Coloring, Positioning

16. Drawing objects GLUT predefined functions Coloring Positioning
glutSolid*
glutWireframe*
Coloring
glColor* - defines the current drawing color
Positioning
glTranslate* - moves the renderer by a vector
glRotate* - rotates the renderer by an Euler angle

17. Camera control & Drawing objects*
Camera control & Drawing objects
Live Demo
(c) 2008 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

18. Basic Lighting
Enabling lighting

19. Basic lighting
Enabling lighting
glEnable
Enabling ‘color material’

20. Basic Lighting Live Demo *
(c) 2008 National Academy for Software Development - All rights reserved. Unauthorized copying or re-distribution is strictly prohibited.*

21. OpenGL Basics ? ? ? ? ?
Questions? ? ? ? ? ? ?