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[4.14] One particle dynamic parameter setting affects another

Here's a weird one.

When using the Particle Dynamic Parameter module to set a value in a material, if you enable the "Spawn Time Only" option in DP0 or DP2, it will enable it for DP1.

DP0 is set to Distribution Float Constant DP1 is set to Distribution Float Constant Curve DP2 is set to Distribution Float Particle Parameter DP3 is set to Distribution Float Constant

DP3's "Spawn Time Only" setting only affects itself.

Product Version: UE 4.14
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asked Feb 10 '17 at 01:18 AM in Bug Reports

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sdi_mdudley
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2 answers: sort voted first

Hey Guys,

This issue has already been found internally and we have logged it at OR-21805. Unfortunately, this won't appear in our public tracker. I can tell you the issue has been marked "backlogged" because we feel in most cases you shouldn't need to set "Spawn Time Only" for a constant value.

Cheers,

Ed

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answered Feb 13 '17 at 02:46 PM

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doesnt happen to me in 4.14. care to share your material?

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answered Feb 10 '17 at 10:25 AM

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Luos
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avatar image frogspasm Feb 12 '17 at 01:22 AM

(logged in from my home account) I was able to repro the bug last night on 4.14.3. It seems to occur when one channel of the dynamic parameters is set to "float constant", and the others are set to "float constant curve". I've attached a material and particle system to illustrate the issue. To see it, open the particle system and go to the dynamic parameter module. Notice the debug info in the particle preview window, with all 4 dynamic parameter channels updating. Enable "Spawn Time Only" on DP0 and notice DP1, DP2 and DP3 stop updating. link text

avatar image Luos Feb 12 '17 at 02:00 AM

wow, thats scary odd.

Hope that isnt the case, or gets fixed asap in 4.15.

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