OpenGL & GLUT Basics

Window reshaping, Keyboard interaction, Camera, Drawing objects

George Georgiev

http://academy.telerik.com

Technical Trainer

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ent-opengl

George AtanasovFront-End Developer

Table of Contents Project using OpenGL & FreeGLUT in MSVC++

Window reshaping Keyboard Interaction Camera

Positioning, orientation

Drawing objects Coloring

Positioning, orientation

Basic Lighting2

Project using OpenGL & FreeGLut

A reminder…

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)

4

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.libfreeglut.lib

Do this for both Debug and Release configurations (upper left corner in the window)

Close the properties window, you’re ready to go

5

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”)

6

Window reshapingThe Reshape function

Window reshaping

Reshape function Specified by glutReshapeFunc

Defines how your window reshapes

Write it once, remember it no more

8

Window reshapingLive Demo

Keyboard interactionThe Keyboard monitoring functions

Keyboard interaction

Keyboard monitoring functions Specified by

glutKeyboardFunc

glutKeyboardUpFunc

Monitor key pressing and key releasing

Doesn’t receive device information Receives translated windows

messages

11

Keyboard interactionLive Demo

Camera controlOrientation and positioning

Camera control

‘Moving the world’ method 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

14

Drawing objectsGLUT predefined objects, Coloring,

Positioning

Drawing objects

GLUT predefined functions 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

16

Camera control & Drawing objects

Live Demo

Basic LightingEnabling lighting

Basic lighting

Enabling lighting glEnable

Enabling ‘color material’

19

Basic Lighting

Live Demo

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