Basic Shapes - C# OpenGL


In this tutorial, we are going to learn how to create basic shapes in c# using OpenGL.

First, we are going to create a new Project and a new Console Application.

It's important that we should have the dynamic libraries in order to use OpenGL . We are going to add this in our project:

image1.gif

We have two variables that specify an angle and a camera angle, we are going to use them for the different perspective in our program, and both are float variables.

We are going to create a method called 'dibuja' in which we'll create our different shapes and specify color and size.

This sentence is use in order to clean the screen buffer..

Gl.glClear(Gl.GL_COLOR_BUFFER_BIT | Gl.GL_DEPTH_BUFFER_BIT);

The next two sentences are important in OpenGL

Gl.glMatrixMode(Gl.GL_MODELVIEW);

Gl.glLoadIdentity();           

Then, we specify the perspective…

Glu
.gluPerspective(45.0, 1.0, 1.0, 500.0);

And the color, as we know, the colors in the computer are handleled like RGB (Red-Green-Blue), and in the sentence thats exactly the value that we are going to specify in the parameters…

Gl.glColor3f(0.5f, 0.9f, 0.9f);

And then we create our shapes, writing the position of each vertice in x, y, and z.

And this is the complete method:

image2.gif

We create our shapes, and in each point of our triangle or our shape, we can change the color and create different effects of color, this will change automatically.

The next method will help us to rotate our shapes, this is only for create an effect in our project…

image3.gif


Then, we have the method initRendering, this is only the method in which we'll enabled and disabled different OpenGL functions.

The comment is our background window color; include the RGB and alpha parameters.

image4.gif

And our main method.

image5.gif

This sentence specify the window's size

Glut.glutInitWindowSize(400, 400);

Then, we have the title of our window Glut.glutCreateWindow("***BASIC SHAPES***");

Then we call our method initRendering in order to enabled our OpenGL functions

initRendering();

and call the other methods

Glut.glutDisplayFunc(dibuja); //this will draw our shapes

Glut.glutTimerFunc(25, update, 0); //this will create an effect

We compile and ready.

We have basic shapes with color and effect in OpenGL and C#.

image6.gif

  

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