MyGUI in multiple renderwindows

We are using some version of MyGUI 2 in a project where we render the scene into multiple windows - think like a 3D modeling tool. We cobbled together a system where each time a render-window was about to be rendered, we had to hide all of MyGUI and show the widgets relevant to that target... ugly

It seems like the RenderBox widget provides one way to avoid such kludges in version 3? But is it the only way or does MyGUI actually link widgets per-rendertarget at a deeper level? In other words if I just have multiple render targets, can I have a GUI for each without wrapping them in RenderBox widgets?

RenderBox is not a widget - it is small wrapper, that helps to show meshes or information from Camera/Viewport. So nothing about rendering GUI inside.

And what about multiply render targets: MyGUI support rendering into texture, so easiest way will be to create a layers for each render target and use textures from this layers on different viewports.

According to the docs, it is a widget: http://mygui.info/docs/class_my_g_u_i_1_1_canvas.html - but you're saying it doesn't support adding child widgets?

I didn't understand the second part of your reply. Let's say I have two Ogre::RenderWindow instances R1 & R2 and two layout files r1.layout & r2.layout. How do I manage it so r1.layout is shown on R1 and r2.layout on R2?

Yeah, it was a widget earlier, but never for showing other widgets.

What about having two layers for different renderwindows - both layers are rendered into texture and not displayed at screen by default. To show GUI you should display this textures somehow.

That sounds like you'd still have to register a frame listener or something - I thought in 3.0 MyGUI changed to support multi-window applications. Maybe the old problem was that MyGUI used to be singleton based, now you can create multiple MyGUI instances - does that sound likely?

MyGUI still use singletons and there is only single instance of Gui and it's parts. And what I was saying about textures still done in single rendering context, so nothing changed there.

Could you explain your task a bit more, because I start thinking that you use GUI in some really odd way and there are much easier solutions for your task.

I have two separate windows - e.g. 2 HWNDs each with its own Ogre::RenderWindow. This use-case is not so common in games, but is in tools. I don't understand your discussion of textures I'm afraid - I simply remember in 2.x MyGUI didn't have anything to support this (so we made ugly hack) and I was told this had changed in 3.x. Maybe it didn't.