Hello!

As for frames:

Placing TCastleControl inside an FMX frame should work, as TCastleControl is a regular FMX visual component.
There is no "frame you could put inside TCastleControl" as rendering done using TCastleControl is controlled using our engine. FMX controls use their own rendering code (like Skia and non-Skia FMX drawing).

As for cooperation with Skia4Delphi:

This is a great question, I have to research it :)
In principle, I don't see why it would not work.
- We just need a way to have OpenGL context (and in future e.g. Vulkan context) created for our control.
- There are various ways for this, the one we use now on TCastleControl+FMX relies that our FMX control has "native" flag and gets own Windows handle.
- I don't see why it would fail with Skia4Delphi -- it doesn't force all components to be rendered using Skia.
- So it should be no problem to have TCastleControl (in FMX frame or not) and surround it with controls rendered using Skia or not.

That said, I need to practically test the latest claim. Also taking into account that latest Delphi has built-in Skia support.

If you have a specific project that fails, please submit it :) In the meantime, I'll try to play with Skia in Delphi + TCastleControl on my side too.

Can Castle Engine and Skia4Delphi work together in a Delphi project, using FMX Frames for UI design? #703

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