Drawing a Cube

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Drawing a Cube

Written by Mark Relunia Monday, 08 June 2009 17:29

Have you ever heard the Cartesian coordinate system? I bet you know it if you took trigonometry class.

Basically, you have x and y axis there, right? And it looks like this.

In 3D world, we now have a new axis, the z axis. It is the depth of a 3D object. Try looking at the picture below and I'm pretty sure you'll get what I mean.

So, drawing a cube will require you to have an 8 vertices.

 
// { X, Y, Z }
float vertices[8][3] = { { 1.0f, 1.0f, 0.0f },    //Vertex 0
                         { 0.0f, 1.0f, 0.0f },    //Vertex 1
                         { 0.0f, 0.0f, 0.0f },    //Vertex 2
                         { 1.0f, 0.0f, 0.0f },    //Vertex 3
                         { 1.0f, 0.0f, 1.0f },    //Vertex 4
                         { 1.0f, 1.0f, 1.0f },    //Vertex 5
                         { 0.0f, 1.0f, 1.0f },    //Vertex 6
                         { 0.0f, 0.0f, 1.0f }};   //Vertex 7

Then to draw it.

 
//Note: The order of the vertices is very important especially if you're going to use texture mapping. 
Front Face         
Draw(vertices[0], vertices[1], vertices[2], vertices[3]);

Back Face
Draw(vertices[4], vertices[7], vertices[6], vertices[5]);

Right Face
Draw(vertices[0], vertices[3], vertices[4], vertices[5]);

Left Face
Draw(vertices[1],vertices[6],vertices[7], vertices[2]);

Top Face
Draw(vertices[0], vertices[5], vertices[6], vertices[1]);

Bottom Face
Draw(vertices[7], vertices[4], vertices[3], vertices[2]);

So that's it! If you have any problems, just post a comment here or try to email me. Good luck.

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