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Is it a bug with parameter collection?

I have a simple parameter collection (screen_01) and a simple material (screen_02). But when I compile this material it uses only first one parameter from the list (screen_03). Am I doing something wrong or this is a bug? I am using 4.7.4

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asked Apr 02 '15 at 10:46 PM in Bug Reports

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NKos
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avatar image NKos Apr 03 '15 at 09:35 AM

Well... While I'm investigated this bug, I rename parameters, delete them and add new ones to the list, etc... it just fixed them self. I don't know how, but now it works! And i didn't notice any regularity of this bug

avatar image todernst Jun 15 '15 at 05:32 PM

I'm having this problem too. I'm using 24 parameters and only the second one is reverting to the Parameter name no matter what I do. I've been trying to fix this for 3 days now and having had the same luck of it just automatically working again.

NKos, do you remember the order of operations you took when it finally fixed itself?

avatar image NKos Jun 15 '15 at 05:54 PM

When you create your Parameter collection DON'T use duplicate alt text

Just use Adds element

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And i still think that there is a bug

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avatar image todernst Jun 17 '15 at 07:56 PM

I can add my confirmation that this worked for me. Thank you, NKos

avatar image AntonioE Apr 20 '16 at 10:24 PM

omg.... I was having this same problem! THANKS!

avatar image SVR33 Apr 02 '17 at 12:44 PM

It seems this issue still exists in some fashion. I'm in 4.15.0 and couldn't, for the life of me, figure out why my MPC wasn't updating when being called by a BP. The really odd thing is that it had been working for 3 months and I hadn't touched it. I found this thread, tried deleting the parameter element and recreating it, and it works again.

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1 answer: sort voted first

Hi NKos -

I have reported the issue with Duplicated Parameters in the Collection Parameters as UE-17063. Your use of the add instead of the duplicate is the intended way to add new parameters to the MPC.

Thank You

Eric Ketchum

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answered Jun 15 '15 at 06:34 PM

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Lovecraft_K ♦♦ STAFF
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avatar image ash22 Jun 14 '16 at 07:55 AM

I also (just) had this bug (4.11.2).

I duplicated a collection parameter element and renamed it like I have always done without issue. (It is quicker to duplicate and edit an element in a collection if the names are incremental, e.g. myVal_1, myVal_2, etc).

Today, however, the value for an element I duplicated was not being read from my material as expected. I saw NKos' post and decided to delete the erroneous element and recreate it using [+Add] instead of [Duplicate] which indeed fixes (well ..works around) the bug.

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