I tried to search whether this bug was reported in the past. Maybe it's the same as issue discussed here (plus I found a few more similar discussions), but because it's more than a year old discussion and the bug still exists, I wrote this post.
The problem was discovered by by customer, but original data cannot be shared, so I created very simple test case to illustrate the bug. Unfortunately, it's critical issue, blocking migration to CE (they use MicroStation and ORD). I informed my other customers working with similar data (literally, all civil customers) about this threat, because data are displayed differently.
There is 2D model, referencing another 2D DGN and DWG (3D, but with 2D elements at Z=0 in tested case). In the root model, there is a raster attached (tested with WMS, but raster file attached from disk has the same problem). Because the raster is at background plane, in V8i is correctly displayed behind all elements. But in CE U15, it hides elements from DWG:
I guess the problem itself is clear: Even when the raster has to be always at background, it's not. And because the results are different in CE U15, it's very dangerous (and migration blocking) bug, because some geometry can be hidden without any notification. And there is no chance, when typical civil design consists from tens of DGN and DWG files, to check every file whether everything is correct or not.
Quite accidentally I found a dependency: When references Update sequence dialog is used and root model is changed to be first, hidden elements are displayed. But it cannot be used as a workaround in many situations, because such change would break something else.
I will create also Service Ticket for this issue.
The test case is attached (used WMS is public). Can somebody from Bentley confirm the issue, whether it's defect #1064558 or a new one, and if its fix is planned for U16?
The Update Sequence is incorrect if you want the references to display on top of the raster. The Update Sequence of the references will display the last one in the list on top of the previous files.
Think of it this way; the one listed first is the first one processed and displayed. The second one listed is then processed next and will be displayed on top of the first one processed. (newest on top) MicroStation continues down the list displaying each file on top of the files further up the list.
So the first thing you want to do is move the Active Design File to the top of the list in the Update Sequence dialog box. This will take care of the DWG file displaying on top of the active file (raster image).
Something that may be effecting the display order is the “Plane” setting in the Raster Manager dialog box. With your drawings, this setting was available to me sometimes and not other times. It should only be available for raster references and not embedded rasters. I am not sure why I got it sometimes but it does seem to effect the display order of DGN references and rasters. It allows you to display rasters as a background. This may be why the referenced DGN was displayed on top of the raster image and not use the Update Sequence. It did not affect the display order of the DWG reference. If anything, this needs to be looked into be Bentley.
Since the Update Sequence was wrong in your drawings, and should have the active file listed first, this may be Working As Designed. I do not have V8i installed to compare the two versions but V8i Did not have the “Plane” setting in Raster Manager and could be causing the difference.
@Jayson; you may want to research this issue further.
Pellet Pusher said:The Update Sequence is incorrect if you want the references to display on top of the raster.
In my opinion you do not understand the reported problem: It's not about whether Update sequence is correct or not, which, btw, is), but that design files created in V8i are displayed (and printed) differently in CE, which can easily lead to serious troubles in engineering practice.
Pellet Pusher said:Think of it this way
Even when you are right in general, this rule is not valid for the discussed situation, because when a raster is placed at background plane, it was defined (at least in V8i) it will be always behind vector elements. It's the reason why the background plane (and foreground plane) exists.
Pellet Pusher said:With your drawings, this setting was available to me sometimes and not other times.
They are clear rules defined, when planes can be used (are supported), so it's not "sometimes". The planes were introduced together with element priority concept and they made Update sequence obsolete in 2D completely (but still useful in some 3D scenarios).
Pellet Pusher said:Since the Update Sequence was wrong in your drawings
Again, you missed the point: Something that works fine in V8i does not work in CE.
The second point you miss is that assignment to background planes have the highest priority (controls how raster are displayed) over all other settings.
Bentley Accredited Developer: iTwin Platform - AssociateLabyrinth Technology | dev.notes() | cad.point
Hi Jan. This is marked as WAD (works as designed) however, you are correct in that we have not made it clear how the update Sequences work and which one wins. We will continue to investigate and will write a blog on the topic.
Will you also add the clarification to the Help file? That's the first place plenty of users will look to see how the software works. They may not know to look for a blog.
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If you are going to write a blog on the topic, I would like to suggest that you include the following: Raster Reference plane, Update sequence, Priority (2D drawing) and in the View Display Styles the setting “Use File Order”. All of these settings, and there could be more, control the display order of elements in a drawing. We need to understand the order of priority to be able to control how the drawing should display. Thanks
Pellet Pusher said:We need to understand
I agree. It's long term problem with MicroStation documentation: Even when CE documentation is much better than was in the past in my opinion, it's primarily "how to" oriented (which is fine). But technical reference with deep detail information is mostly missing (wiki does not represent systematic approach to this topic).
To don't be negative only, there are exceptions: e.g. Configuration Concepts chapter is the nice example of "technical reference" approach, included into "how-to" doc ;-)
E.g. Divio documentation framework explain nicely the difference and documentation types and tries to standardize the approach (even when still some types of documents are not covered ;-).
Pellet Pusher said:I would like to suggest that you include the following
There should be much more variants covered, e.g how these concepts (priority + planes + update sequence) work together when 3D is referenced to 2D, vice versa 2D to 3D, and also combination of formats (because of difference features are supported in 2D DGN, 3D DGN and DWG). It leads to many (tens?) variants, but probably based on just a few rules, unfortunately not clear from outside.
I often see outputs, composed from complicated mixture of 2D and 3D files and different formats, when especially deeply nested settings cannot be changed easily. And it's not simple to find the right solution without knowing the rules at background.
Samir Haque said:This is marked as WAD
well, probably yes, but until the rules are clear, it's hard to understand what WAD is ;-)
In my opinion the discussion has split into three independent topics now: