Game Development Reference
In-Depth Information
triangles, each using 3 out of our 24 vertices. We can create a mesh for this cube using vertex
indexing, as follows:
float[] vertices = { −0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
0.5f, 0.5f, 0.5f,
0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
-0.5f, 0.5f, 0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, 0.5f,
0.5f, 0.5f, 0.5f,
0.5f, 0.5f, -0.5f,
-0.5f, 0.5f, -0.5f,
-0.5f, -0.5f, 0.5f,
0.5f, -0.5f, 0.5f,
0.5f, -0.5f, -0.5f,
-0.5f, -0.5f, -0.5f
};
short[] indices = { 0, 1, 3, 1, 2, 3,
4, 5, 7, 5, 6, 7,
8, 9, 11, 9, 10, 11,
12, 13, 15, 13, 14, 15,
16, 17, 19, 17, 18, 19,
20, 21, 23, 21, 22, 23,
};
Vertices3 cube = new Vertices3(glGraphics, 24, 36, false, false);
cube.setVertices(vertices, 0, vertices.length);
cube.setIndices(indices, 0, indices.length);
We are only specifying vertex positions in this code. We start with the front side and its
bottom-left vertex at (−0.5,-0.5,0.5). We then specify the next three vertices of that side, going
counterclockwise. The next side is the right side of the cube, followed by the back side, the left
side, the top side, and the bottom side—all following the same pattern. Compare the vertex
definitions with Figure
10-11
.
