Texture Coordinates and Indices

It's hard to belive the cube is drawing correctly because all your vertices have the same normal (pointing towards the +y axis). A cube consists of 6 sides and only one of them has this normal => you need 6 different normals (+x, -x, +y, -y, +z, -z), not just 1.
To draw a proper cube with proper lighting and texture coordinates, you cannot go with just 8 vertices. Yes, a cube in theory has just 8 vertices, but each of those 8 vertices is shared by 3 sides of the cube, forcing you to have all the 3 sides share the same parameters in that vertex - this is favourable with position (because position really is shared), but not with normal and texture coordinates.

You'll have to specify 4 vertices per side (6 sides), that means 24 vertices in total.


To understand what was wrong with your texture coordinates, try to draw a cube on a paper (in "3D") and write your coordinates to each vertex. And then verify whether each side has all combinations of coordinates:
0, 0
1, 0
0, 1
1, 1
I bet you'll find out that it's not true in your case.

Hi,
First, you'll have to fix your normals and second, you'll need 24 vertices as Tom KQT said. A normal cube does apper to have only 8 vertices. This means that 1 vertex is shared with 3 sides of the cube. But those 3 sides of the cube have different normals/texture coordinates, so you'll have to describe 24 vertices.

Another way of saying the same thing as the previous two posters: A vertex is not just a position, it's a position, normal and texture coordinate (in your case). You can only share a vertex if the position, normal and texture coordinates are the same - which they're not for the 8 corners of a cube, only the positions are the same.

Ok, perfect!!

I fix it and now works fine!

Thanks for your answers.