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angular distribution of emitter rate

Hi there,

i'm a beginner with the particle system in ue4, and i want to emit particles in an fan shaped way. But i want also control how many particles are emitted in a specific direction. For example: in X-direction i want to emit 10 /s , in Y-direction 50 /s and in -X-direction 20 /s. The amount of particles between those directions should be interpolated. All particles must have the same speed. In other words i want a distribution of the emitter rate not over time but over the direction. If i could control this interpolation with a curve, that would be awesome. I want to archive something like shown in the picture below.

P.S. Unrealengine is awesome, your tutorials in youtube are realy professional i want to say thanks for setting it free.

alt text

Product Version: UE 4.8
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asked Oct 06 '15 at 10:35 AM in Rendering

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avatar image Logan Bailey ♦♦ STAFF Oct 06 '15 at 07:25 PM

Hello Septaros,

So In order to understand exactly what you want this particle system to do I need a little more information.

You said you wanted this to be emitted in a fan shaped way. Do you mean spinning around like a propeller. So the particles will emit at the same sped be at the same spot instead of an actual source.

Are you talking about a fan as in a semicircular way.

After some clarification I will be able to better understand exactly what you are trying to accomplish.


avatar image Septaros Oct 06 '15 at 11:55 PM

Hello Logan,

thank so much for trying to help me.

My english isn't as good as it should be so i rendered a little graph in blender.

no spinning around; all particles must have the same speed;

The reason why it is so important for me to get exact this particle behavior:

I'm a german engineer at a university where i'm involved in the education of new engineer students. I want to visualize the radiation measured in the raman-spectroscopy-experiment for the students. And i also want to virtualize some other experiments with the UnrealEngine. (I dont teach teach the UE4. I use the engine to teach physics in a new way) So if the particle behavior isn't correct, i'll certainly get in trouble with some students ;)

Again many thanks in advance

Sebastianalt text

graph.jpg (93.8 kB)
avatar image Logan Bailey ♦♦ STAFF Oct 08 '15 at 03:48 PM

Let me know if I am on the right track with this. I can refine it a bit through multiple emitters and setting their distribution range.



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Yeah i think it s okay about.

I tried myself a little bit more, and think i ll use something about 10 to 16 transmitters to "fake" the effect i want. All setup with a startvelocity of 100 in X-direction an a little distribution in Y / -Y of about 5 to 10.

Is there a solution to control the emitter rate by a blueprint? so i could setup a formula that calculates the different emitter rates out of my given curve.

But first i try to find tutorials about particlesystems and blueprints and only if it does not go any further i ll come back to you.

I 'm really excited about your support and again i want to thank you for your time spent on me.

Best regards from Zweibrücken (Reinland Palatinate)


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answered Oct 09 '15 at 12:27 PM

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avatar image Logan Bailey ♦♦ STAFF Oct 09 '15 at 03:54 PM


Let me know if you need anymore assistance with this.

avatar image Septaros Oct 10 '15 at 11:03 PM


It works, it's nice and it's connected with a blueprint. If you're intrested:


I ve coloured the different emitters for debugging purposes.

Have a nice day.

avatar image Logan Bailey ♦♦ STAFF Oct 13 '15 at 01:37 PM

Glad I could help. Hope your students will like it.

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