OpenGL & GLUT Basics

Window reshaping, Keyboard interaction, Camera, Drawing objects

George GeorgievTelerik Corporationwww.telerik.

com

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)

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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

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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”)

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Window reshapingThe Reshape function

Window reshaping Reshape function

Specified by glutReshapeFunc Defines how your window reshapes Write it once, remember it no more

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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

messages11

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

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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

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Camera control & Drawing objects

Live Demo

Basic LightingEnabling lighting

Basic lighting Enabling lighting

glEnable Enabling ‘color material’

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Basic LightingLive Demo

OpenGL Basics

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