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"

Office Holiday

Epic Games' offices will be on holiday from June 22nd to July 7th. During this period support will be limited. Our offices will reopen on Monday, July 8th. 

How to script particle systems?

Is it possible to somehow script or change a particle system? For instance, I would like to change the scale of the spawned particles, depending on the current speed of an actor. This could be used to create a cheaper smoke trail for a missile, by stretching the smoke particles in the direction of the rocket's movement.

Alternatively, I could of course just always stretch them, independent from the speed, but in that case I would have to change the particles initial speed based on the rocket's current speed.



Product Version: Not Selected
more ▼

asked Apr 04 '14 at 12:35 PM in Using UE4

avatar image

290 21 32 138

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

1 answer: sort voted first

You can use the Size By Speed module with GPU particles to achieve this.

Alternately, you can create a particleParameter for the sizeScale module, and modify the scale using a variable inside of a BluePrint to change the scale of your particles along an axis based on BluePrint logic.

For any of these solutions you will want to use velocity, rectangle alignment, or a mesh emitter.

Info on particleParameters


more ▼

answered Apr 07 '14 at 03:44 PM

avatar image

[Epic]homeRye STAFF
1.2k 22 3 42

(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