'Private implementation of the `show_block()` method.
Parameters
position : tuple of len 3
The (x, y, z) position of the block to show.
texture : list of len 3
The coordinates of the texture squares. Use `tex_coords()` to
generate.'

def _show_block(self, position, texture):

    (x, y, z) = position
    vertex_data = cube_vertices(x, y, z, 0.5)
    texture_data = list(texture)
    self._shown[position] = self.batch.add(24, GL_QUADS, self.group, ('v3f/static', vertex_data), ('t2f/static', texture_data))
