如何在缓冲区上绘图？

Question

我想使用OpenTK绘制一个3d对象的线框， 但是我不想用opentk方法绘制它，但是我想我必须通过绘制opentk buffor来做它，但不知道如何开始。我的意思是，我有一个绘制方法，但如何从OpenTK覆盖绘图？

// Push current Array Buffer state so we can restore it later
        GL.PushClientAttrib(ClientAttribMask.ClientVertexArrayBit);
        GL.Color3(Color.SkyBlue);
        //GL.ClientActiveTexture(TextureUnit.Texture0);
        //GL.BindTexture(TextureTarget.Texture2D, tex);

        GL.BindBuffer(BufferTarget.ArrayBuffer, dataBuffer);
        // Normal buffer
        GL.NormalPointer(NormalPointerType.Float, 0, (IntPtr)(normOffset * sizeof(float)));

        // TexCoord buffer
        GL.TexCoordPointer(2, TexCoordPointerType.Float, 0, (IntPtr)(texcoordOffset * sizeof(float)));

        // Vertex buffer
        GL.VertexPointer(3, VertexPointerType.Float, 0, (IntPtr)(vertOffset * sizeof(float)));

        // Index array
        GL.BindBuffer(BufferTarget.ElementArrayBuffer, indexBuffer);
        GL.DrawElements(BeginMode.Triangles, mesh.Tris.Length * 3, DrawElementsType.UnsignedInt, IntPtr.Zero);
       // GL.DrawElements(BeginMode.Lines, mesh.Tris.Length * 3, DrawElementsType.UnsignedByte, IntPtr.Zero);
        // Restore the state
        GL.PopClientAttrib();