Question

I am trying to create a 3D box, that would play the role of a playing board/surface/room for a 3D game in C++, using OpenGl. As a starting point I found some code that does that for a 2D surface. My question would be how to modify the following code to serve my purpose:

for (float  i = -width; i + 0.1 <= width; i += 0.1) {
    for (float j = -height; j + 0.1 <= height; j+= 0.1) {
        glBegin(GL_QUADS);

        glNormal3f(0, 1, 0);
        glVertex3f(i, 0, j);
        glVertex3f(i, 0, j + 0.1);
        glVertex3f(i + 0.1, 0, j + 0.1);
        glVertex3f(i + 0.1, 0, j);

        glEnd();
    }
}

Thanks a lot.

Answer 1

You can either use above code 6 times but each time apply different rotation/translation matrix, or you can do it the right way and generate correct geometry for missing 5 walls of your box. There are lots of samples for drawing cubes, ie.:

http://www.opengl.org/resources/code/samples/glut_examples/examples/examples.html