40 reasons maybe why you can’t see object or category in the view within Revit

According to a thread in Revit Forum discuss about why you can’t see some stuff in the view, I resumed and noted a solution for each trouble. Hope to be useful for you.
1. The object or category is temporarily hidden or only some objects/elements are isolating 
Troubleshoot: Reveal and Unhide Hidden Elements

2. The object or category is hidden in the view or incorrect visibility setting
Troubleshoot: 
If the issue is an incorrect visibility setting, try the following:
+ Reset temporary hide/isolate mode
+ Reveal hidden elements in the view
+ Change the visual style to wireframe to show elements behind other elements in the view
+ Change the detail level of the view. Some geometry does not display at certain detail levels

3. The object is being obscured by another element
Troubleshoot: 
Use the Show Hidden Lines command to display model elements and detail elements that are obscured by other elements in the current view. Select the commans, pick the element in the foreground and then pick the element being obscured. The portion of the element previously not visible is now shown with hidden lines.
The Show Hidden Lines by Element tool provides an override for the graphic display of individual elements in the current view. You can use this tool for elements whose categories have the Hidden Lines subcategory.
Note: The Show Hidden Lines by Element tool is not available for:
- Perspective views.
- Views whose Show Hidden Lines view parameter is set to All or None. (It must be set to <By discipline>.)
- Elements in linked models
- Revit MEP, or for views in Autodesk Revit when the Discipline parameter is set to Electrical, Mechanical, or Plumbing.
Find how to exist object to the Hidden Lines Tool at here:

4. The object's category or subcategory is hidden in the view
Troubleshot: Click lightbulb icon on View Control Bar to reveal hidden elements 

5. The object is outside of the view range displayed
Troubleshoot:  
Edit view range properties (including: Top, Cut plane, bottom, offset, Primary Range and view depth) for model elements enable to locate inside of the visible range. the detailed how to edit, find in here:

6. The view's far clip depth is not sufficient to show the object
Troubleshoot: modify the far clip plane by editing the Far Clip Offset parameter or check to the box “No Clip” to turn off the view’s far clip 

7. The object resides on a work set that is not loaded within the project
Troubleshoot: Check the objects workset in the originating model

8. The object resides on a work set that is not visible in the view
Troubleshoot: Check the Phasing/ Phase Filter settings on workset. If the objects are still in the model, you can create a Schedule and that will show them. 
If you have a 'default' 3D View in the project browser with the default "{ 3D }" name, delete it and create a new one.

9. The object resides on a work set that is not loaded in a linked file
Troubleshoot: Check the worksets in the linked model, move the object to another workset.

10. The object resides on a work set that is not visible in a linked file
Troubleshoot: Check visible worksets in the visibility graphics of the linked file. Use the Worksets tab on the RVT Link Display Settings dialog for the host model. On this tab, you can select the specific worksets to display in a view of the host model.

11. The object resides within a group (detail model) and it has been excluded from the group
Troubleshoot: Restore an excluded element/ all elements to a group
How to restore, click here: 

12. The object is part of a design option that is not visible in the view
This happens when the visibility/graphics overrides of the view have been configured to show a specific Design Option, instead of automatic selection of the Design Option to show.
Troubleshoot: 
select the view, and click the Edit button next to Visibility/Graphics Overrides in the Properties panel. Go to the Design Option tab in the window and change the setting from one of the Design Options to <Automatic>

13. The object is part of a linked file that is not visible in the view
Troubleshoot: Check visible of linked file, view range, show hidden lines...

14. The object has one or more of its edges overridden to display as '<Invisible lines>'
Troubleshoot: If the project is workshared, in the Visibility/Graphic Overrides dialog, click the Worksets tab and turn off any applied filters

15. The object is a family and none of its geometry is set to be visible in the view type
Troubleshoot: Modify visibility settings to select the views and detail levels in which you want family geometry to display.
Check how to Set Family Geometry Visibility in here: 

16. The object is a family and none of its geometry is set to be visible at the view's detail level
Troubleshoot: Modify visibility settings to select the views and detail levels in which you want family geometry to display.

17. The object is set to not be visible at the category's detail level
Troubleshoot: Modify visibility settings to select the views and detail levels in which you want family geometry to display. 

18. The element has been placed outside the view's crop region (visible extents)
The crop region defines the boundaries for a project view. You can display a model crop region and an annotation crop region in all graphical project views. Perspective 3D views do not support the annotation crop region. 
Troubleshoot: 
- The crop region may be hidden, On the View Control Bar, click    to Show Crop Region
- Using the drag controls and the break line controls to resize the split crop regions or turnoff the crop region in the view

19. The element is an annotation object and does not reside entirely within the annotation crop region
Troubleshoot: 
- After you show crop regions, if the annotation crop region is hidden, right-click in the drawing area, and click View Properties.
- On the Properties palette, clear the check box for Annotation Crop to clarify all of elements

20. The object's phase settings or the view's phase settings prevent the object from displaying in the view
Troubleshoot: Check the objects phase, it should show you in properties as you are trying to place it in the view. If your views phase or phase filter is set differently, you may not be seeing the item because of it.

21. Check the View Discipline
The Discipline property will affect views if you are using a single model that incorporates multiple disciplines, or the model links to other discipline-specific models.
Troubleshoot: Set the view to coordination in the element properties by setting the Discipline property for a view, select the view name in the Project Browser, or open the view. On the Properties palette, the Discipline property is listed in the Graphics section. Select a value from the list.

22. The object is affected by a filter applied to the view
Troubleshoot: Check what filters are applied under the filters tab in the visibility graphics. Select the Visibility check box to turn visibility of the filtered object on.

23. The object is subject to an element override, set to background color
Troubleshoot: Change the background color (black to white or vice versa)

24. The object is subject to a category override, set to background color
Troubleshoot: Change the background color (black to white or vice versa)

25. The object style is set to background color
Troubleshoot: Check the setting of object styles. Check the object is under visibility/ Graphics dialog box

26. The object is constrained to a scope boxes that is not visible in the view
Troubleshoot: Click reveal hidden elements (light bulb) to see if any scope boxes are hidden.

27. The extents of the object itself don't permit it to be seen
Troubleshoot: Use Zoom All to Fit to help locate geometry that is a large distance from its origin.

28. The object is a mass, and 'Show Mass' is turned off or the view is zoomed in too close to the mass.
Troubleshoot: Turn on “show mass” or type ZF to Zoom to Fit

29. The object's host view has been deleted (area boundaries)
Troubleshoot:  If you tried to paste an element into a location that does not contain a proper host, you see the warning "Elements were deleted. Use Edit Pasted Elements to keep them". Click Cancel to remove the warning. On the ribbon, click Edit Pasted Elements. In Edit Pasted mode, place the copied element on its proper host. Click Finish to complete the paste process.

30. The view's scale is prohibiting the object's visibility
Troubleshoot: In the View Properties for the callout detail view, the Show in parameter controls the Hide at scales coarser than value. (The Show in parameter is not available for plan callouts.) When the Show in value is Parent View Only, Hide at scales coarser than is read-only. When the Show in value is Intersecting Views, you can change the value of the Hide at scales coarser than parameter. As a result, Revit displays the callout tag in any views that intersect the parent view perpendicularly, as long as the view scale is more detailed than the scale specified by Hide at scales coarser than.

31. The object is a linked instance with coordinates too great for Revit to handle
Troubleshoot: relocate the model by specifying coordinates
Check here for detail method

32. The user has incorrectly identified the link instance to which the element belongs

33. The object is in a link that is not in its correct position
Troubleshoot: Zoom extents to locate the linked model, and reset it to it's correct location.

34. Wall is subsumed by automatically-embedded curtain wall
Troubleshoot: To determine whether the curtain wall type automatically embeds into another wall, check the type properties of the wall. Select the Automatically Embed parameter if it is not already selected.

35. Something is really far away from the middle of the project and when the view is zoomed to fit, everything disappears

36. Element is white and its edges coincide with other objects. E.g., GWB ceiling in RCP
Trouble shoot: Look in the View Properties... Underlay Orientation should be Reflected Ceiling Plan.

37. the object is subjected to the yes/no parameter...
Troubleshoot: Check the object is under the Yes/No visibility parameter formula. 

38. Link the models to a model by mapping phase but the phase filter don't show correctly for the linked model.
Troubleshoot: Check the Phases name and Phase filters names between linked files must match and in both case this name is also case sensitive.

39. The object you loaded is 2D not a 3D family (so can't be seen in the 3D view)

40. And finaly (in this article, not all of scenarios) if you have tried all of aboves, let check to see if you actually drew the object you want to find ...

ViBIM has extensive experience in Revit BIM modeling for 5 years.

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