private void addVertices(Vertex[] vertices, int[] indices, boolean calcNormals)
	{
		if(calcNormals)
		{
			calcNormals(vertices, indices);
		}
		
		size = indices.length;
		
		glBindBuffer(GL_ARRAY_BUFFER, vbo);
		glBufferData(GL_ARRAY_BUFFER, Util.createFlippedBuffer(vertices), GL_STATIC_DRAW);
		
		glBindBuffer(GL_ELEMENT_ARRAY_BUFFER, ibo);
		glBufferData(GL_ELEMENT_ARRAY_BUFFER, Util.createFlippedBuffer(indices), GL_STATIC_DRAW);
	}