This .NET class wraps the AcDbRenderEnvironment ObjectARX class. 

This is a container class for environment-related properties, including fog / depth cue and the global environment image. Only one object of this type is maintained by the per-drawing RenderGlobal object, at ACAD_RENDER_ENVIRONMENT in the named object dictionary.

Autodesk.AutoCAD.DatabaseServices.DBObject
    Autodesk.AutoCAD.DatabaseServices.RenderEnvironment

Public Class RenderEnvironment
Inherits DBObject

public class RenderEnvironment : DBObject;

RenderGlobal