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"

Ribbon particle, dynamically controlling lifetime no fluid update?

I'm trying to 'animate' a ribbon particle so it slowly grows longer. The ribbon trails behind a vehicle that is driving quite fast. Even though I use a value that linearly increases from 0 to 1 to drive this and update it on tick, the ribbon activates, stays short and at a random time pops to its long version.

Lifetime settings alt text Update settings alt text I've already noticed that trying to set the lifetime from 0 to 1 doesn't work, since a lifetime of 0 seems to mean infinite. That is why I'm trying 0.03 to 0.6 as you can see in my ribbon settings. The spawn rate i've set to 90. Short Version: alt text Long version which also looks buggy: choppy and as if there are 2 ribbon trails. alt text At a random time it can start looking like i want it and then go back to the buggy version. Good ribbon: alt text

To me it seems like an update problem. As if it doesn't flag the particle system to having to change? Anyone has any other ideas to dynamically control the length of a ribbon particle?

Product Version: UE 4.15
more ▼

asked Apr 06 '17 at 08:02 AM in Bug Reports

avatar image

58 1 7 11

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

1 answer: sort voted first

Hey Esther,

Thank you for submitting this post. I have reproduced this issue and logged a report for it here: https://issues.unrealengine.com/issue/UE-44115

You can track the report's status as the issue is reviewed by our development staff. Please be aware that this issue may not be prioritized or fixed soon.

There doesn't appear to be a simple workaround for this other than ending the ribbon trail every time you need to adjust lifetime. I know that doesn't help your case so you may need to rely on clever material work to get the effect you want.


Ed Burgess

more ▼

answered Apr 18 '17 at 05:14 PM

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