int uModel = GL.GetUniformLocation(mShader.ShaderProgramID, "uModel");

            Matrix4 mat = mSphereModel * mGroundModel;
            mat = Matrix4.CreateTranslation(-1, 1, -1);

            GL.UniformMatrix4(uModel, true, ref mat);

            GL.BindVertexArray(mVAO_IDs[1]);
            GL.DrawElements(PrimitiveType.Triangles, mSphereModelUtility.Indices.Length, DrawElementsType.UnsignedInt, 0);