public void RenderKnob(Vector3[] corners, int sel_index)
{
Vector3[] gui_knobs = BuildKnobs(corners);
for (int i = 0; i < gui_knobs.Length; ++i)
{
Vector3[] rect = MathTool.GetRect(gui_knobs[i], MathTool.s_knob_half_size);
if (MathTool.ClipRect(m_view_rect, rect))
{
Color color = (i == sel_index ? Color.yellow : Color.green);
Handles.DrawSolidRectangleWithOutline(rect, color, color);
}
}
}