Base class of the UI widget hierarchy. MAYDO: a bunch of stuff in that class is intended specifically for the root element, there is probably a batter design to find
Reasonable default value for the Depth channel.
Reasonable dielectric default value for the Metalness channel.
Reasonable metal default value for the Metalness channel.
Reasonable default value for the Physical channel (completely physical).
Reasonable default value for the Roughness channel.
Reasonable default value for the Specular channel ("everything is shiny").
UIElement is the base class of all widgets.