for (int z = 0; z < blockSize + 1; z++) {
Voxel voxel = voxels[x][y][z];
if (voxel != null) {
voxel.summarize();
octree.insertVertex(x, y, z, voxel.index);
int i3 = voxel.index * 3;
vertexBuffer.put(i3+0, voxel.vertexPosition.getXf());
vertexBuffer.put(i3+1, voxel.vertexPosition.getYf());