Programming - Games - 3D Tutorial

Entering the World of 3D:

In this Tutorial we will made 3D objects rather then 2D. This tutorial is in continuation with the previous one. In this section we will change the same method ' DrawGLScene ' to draw 3D objects.

We will create cube by adding left, right, back, top and bottom to the squar and make pyramid by adding left, back, and right side to the triangle.Here is the code for pyramid.

int DrawGLScene(GLvoid)
{
glClear(GL_COLOR_BUFFER_BIT | GL_DEPTH_BUFFER_BIT);
glLoadIdentity();
glTranslatef(-1.5f,0.0f,-6.0f);
glBegin(GL_TRIANGLES);

/* Front side with Red Color */

glColor3f(1.0f,0.0f,0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f, 1.0f);
glVertex3f( 1.0f,-1.0f, 1.0f);

/* Right side with Blue Color */

glColor3f(0.0f,0.0f,1.0f);

glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, 1.0f);
glVertex3f( 1.0f,-1.0f, -1.0f);

/* Back side with Red Color */

glColor3f(1.0f,0.0f,0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f( 1.0f,-1.0f, -1.0f);
glVertex3f(-1.0f,-1.0f, -1.0f);

/* Left Side with Green Color */

glColor3f(0.0f,1.0f,0.0f);
glVertex3f( 0.0f, 1.0f, 0.0f);
glVertex3f(-1.0f,-1.0f,-1.0f);
glVertex3f(-1.0f,-1.0f, 1.0f);
glEnd();

// Continue .....

First 6 lines are same.We have already draw the front side of the triangle in our previous tutorial. As u can see in the remaining part of the code we did nothing , just made 3 more sides(right, back , left ) with different colors. You can also use shades of different colors as we defined in our previous tutorial.

Here is the code for Cube.

glLoadIdentity();
glTranslatef(1.5f,0.0f,-7.0f);
glBegin(GL_QUADS);

/* Top Side of the Cube with different shades of colors */

glColor3f(0.0f,1.0f,0.0f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right
glColor3f(1.0f,0.0f,0.0f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left
glColor3f(0.0f,0.0f,1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Bottom Left
glColor3f(0.0f,1.0f,1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Bottom Right

/* Bottom Side of the Cube with different shades of colors */

glColor3f(1.0f,0.5f,0.0f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Top Right
glColor3f(1.0f,0.0f,0.0f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Top Left
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left
glColor3f(0.0f,0.0f,1.0f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right

/* Front Side of the Cube with different shades of colors */

glColor3f(1.0f,0.0f,0.0f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Right
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Left
glColor3f(0.0f,0.0f,1.0f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Left
glColor3f(1.0f,0.0f,1.0f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Right

/* BackSide of the Cube with different shades of colors */

glColor3f(1.0f,1.0f,0.0f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Top Right
glColor3f(0.0f,1.0f,0.0f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Top Left
glColor3f(0.0f,0.0f,1.0f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Bottom Left
glColor3f(0.0f,1.0f,1.0f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Bottom Right

/* LeftSide of the Cube with different shades of colors */

glColor3f(0.0f,0.0f,1.0f);
glVertex3f(-1.0f, 1.0f, 1.0f); // Top Right
glColor3f(0.0f,0.5f,1.0f);
glVertex3f(-1.0f, 1.0f,-1.0f); // Top Left
glColor3f(1.0f,0.5f,0.0f);
glVertex3f(-1.0f,-1.0f,-1.0f); // Bottom Left
glColor3f(0.0f,1.0f,1.0f);
glVertex3f(-1.0f,-1.0f, 1.0f); // Bottom Right

/* Right Side of the Cube with different shades of colors */

glColor3f(1.0f,0.0f,1.0f);
glVertex3f( 1.0f, 1.0f,-1.0f); // Top Right
glColor3f(0.0f,0.0f,1.0f);
glVertex3f( 1.0f, 1.0f, 1.0f); // Top Left
glColor3f(0.0f,1.0f,1.0f);
glVertex3f( 1.0f,-1.0f, 1.0f); // Bottom Left
glColor3f(1.0f,0.5f,1.0f);
glVertex3f( 1.0f,-1.0f,-1.0f); // Bottom Right

glEnd();
return TRUE;
}

Same as previous we made other more 5 sides(back,botton,top,left,right) to draw a Cube.

Your output will be like .

Download the Source Code.

next: rotation

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see also:	Same tutorial using VB C++ C# computer language
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Programming - Games - OpenGL and C++