Change positional representation in Presentation (Inventor 2018)

[DRoam]

Why can't the positional representation of a Presentation be changed?

All of the Presentation tweaks are just overrides to the initial positions of the components. I can't see any logical reason why those initial positions couldn't be changed by selecting a specific positional rep.

I have an old Presentation that was created using the Master position rep, which leads to issues on the drawing when the assembly components are moved around. The easy solution would be to apply a specific positional rep to the Presentation. But apparently this is blocked, for no good reason that I can think of.

Why is this not allowed, and is there any sort of workaround?

[Mark.Lancaster]

@DRoam

Once a positional rep or LOD is created for a presentation it can't not be changed/modified.  See this https://knowledge.autodesk.com/support/inventor-products/learn-explore/caas/CloudHelp/cloudhelp/2016...

[DRoam]

Hi Mark, thanks for the link but I already knew this. I'm asking if there's a reason this is blocked, and if there's a workaround so I can keep my Presentation from moving when the original assembly does but without having to re-create my presentation from scratch with the correct View Rep, then delete the existing Drawing view of the presentation and re-annotate it from scratch.

[Mark.Lancaster]

@DRoam

My bad.. 

I don't use the IPN enough and when I do its more related to View reps and not LOD or Positional Reps.   Which means I don't know why its not an option or if there's an alternative workflow for what you need.  Hopefully someone will come along and give you the answer you seek..

[johnsonshiue]

Hi Derek,

If I understood how IPN works correctly, it is related to how a given view is setup. When the user selects a PosRep on placing the assembly into a presentation view, all the components are placed according to the given PosRep. Then, these components become fair game. Each one can be tweaked individually or as a group. To certain degree, the concept of assembly or subassembly as structures no longer exist in such state. Let's say we did allow you to choose a different PosRep in a given view, more than likely most tweaks would need to be redefined. You might as well delete the view and recreate it with a different PosRep.

Technically, anything is possible. It is just that to fulfill the behavior, the change would be disproportionally large compared to the gain.

Many thanks!

[DRoam]

@johnsonshiue, thanks for the reply.

I can go into my assembly and drag things around or change constraints until it looks like a tornado went through my assembly, then go back to the Presentation, and it will simply update based on the new position of each Part.

How is selecting a different PosRep any different (as far as tweaks are concerned) than moving components around in the current PosRep? Why restrict the former but not the latter?

[johnsonshiue]

Hi Derek,

I will try to get more clarity on the difference. But, there is indeed difference between an assembly in Master PosRep and a non-Master PosRep.

Many thanks!