Search in
Sort by:

Question Status:

Search help

  • Simple searches use one or more words. Separate the words with spaces (cat dog) to search cat,dog or both. Separate the words with plus signs (cat +dog) to search for items that may contain cat but must contain dog.
  • You can further refine your search on the search results page, where you can search by keywords, author, topic. These can be combined with each other. Examples
    • cat dog --matches anything with cat,dog or both
    • cat +dog --searches for cat +dog where dog is a mandatory term
    • cat -dog -- searches for cat excluding any result containing dog
    • [cats] —will restrict your search to results with topic named "cats"
    • [cats] [dogs] —will restrict your search to results with both topics, "cats", and "dogs"

UMaterialParameterCollectionInstance objects leaking when streaming levels


I noticed that UMaterialParameterCollectionInstance objects created for use in some streamed levels are not destroyed even after the streamed level is unloaded. The specific sequence is:

  • Gameplay starts with Level 1

  • Level 2 is loaded through streaming

  • Level 2 requires a specific MaterialParameterCollection, e.g. MPC_X, for use from one of its materials.

  • While loading MPC_X, it registers corresponding UMaterialParameterCollectionInstance objects with both Level 1 and Level 2 (see code in UMaterialParameterCollection::PostLoad).

  • After some gameplay Level 2 is unloaded but Level 1 remains loaded. However, the UMaterialParameterCollectionInstance corresponding to MPC_X remains registered with Level 1, thereby leaking both the collection instance and MPC_X.

To fix this, I was thinking of making the following changes:

  • Change the Collection member of UMaterialParameterCollectionInstance to be a weak pointer.

  • Override BeginDestroy in UMaterialParameterCollection and remove corresponding collection instances from all worlds.

Would that be the best way to fix this issue? Or is there another way?

(The leak by itself isn't critical as the objects don't take up too much memory, but the objects are spamming a "leak report" I'm working on, so it would be nice to clean those up properly)



Product Version: UE 4.11
more ▼

asked Jul 12 '16 at 06:49 PM in C++ Programming

avatar image

1 1

(comments are locked)
10|2000 characters needed characters left
Viewable by all users

0 answers: sort voted first
Be the first one to answer this question
toggle preview:

Up to 5 attachments (including images) can be used with a maximum of 5.2 MB each and 5.2 MB total.

Follow this question

Once you sign in you will be able to subscribe for any updates here

Answers to this question