Particle system start speed (startSpeed) as a curve

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It appears that in a particle system you can set the starting velocity of the particle not only to a scalar value, but also to a curve. Here's what the documentation says on the matter:

When using curves, this values acts as a scale on the curve.

~~This isn't even proper English.~~ It isn't clear what this means. So, how does the curve work as a start speed of the particle system? What can be accomplished with it?

Answer 1

Answer by cdr9042 · Dec 03, 2019 at 02:56 AM

the horizontal axis of the curve means the time passed during a particle system's duration. For example, if you turn off looping and set the particle's duration to 5 seconds, and set the start speed curve to go from 0 to 1, then when the particle starts firing, it will gradually increase the start speed from 0 to 1 during its 5 seconds duration.

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MaxYari · Apr 26, 2020 at 09:26 AM 0

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Doesn't seem to be the case in 2019.3.7f1, only the leftmost curve value is used, i.e in your example speed will just stay at 0 :(

MaxYari · Apr 26, 2020 at 09:31 AM 0

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https://i.gyazo.com/0f4ecc50aebb000d8b18a33b11577a8f.mp4

djnX · Sep 18, 2021 at 10:13 AM 0

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@MaxYari It is because all your particles are generated at time 0:00 . At time 0, the leftmost value is used. If you have particles generated at time 0:01, they will use speed at time 0:01 from the curve.

djnX · Sep 18, 2021 at 10:14 AM 0

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@MaxYari I think you are using Bursts in Emission and all your particles spawned at time 0. If you use Rate Over Time, you will see how the curve works.

Particle system start speed (startSpeed) as a curve

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