static void AddDefaultCustomEnvironment(RhinoDoc rhinoDoc) { // There is no default environment so add one now var type = typeof(CustomEnvironment); var content = RenderContent.Create(type, RenderContent.ShowContentChooserFlags.None, rhinoDoc) as CustomEnvironment; if (content == null) { return; } rhinoDoc.CurrentEnvironment.ForBackground = content; rhinoDoc.RenderSettings.BackgroundStyle = BackgroundStyle.Environment; }