Camera3DConfig Type
Camera rendering configuration for 3D pipelines.
MonoGame analogue of the raylib-side Camera3DConfig.
Viewport is expressed in **pixels** as a Rectangle,
since MonoGame's GraphicsDevice.Viewport is pixel-based.
ValueNone means fullscreen (no custom viewport).
ClearColor doubles as the clear signal:
ValueNone = don't clear (overlay on existing content),
ValueSome color = clear with this color before rendering.
Mibo