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RBD emit problem. One particle emit instantly


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I use scatter to generate particles and set one particle per 50 frames. Then I copied one sphere to the particles and use pop network to simulate. The spheres are emitted continuously (I guess one sphere per frame) from the same place. That is not what I want. I just want one sphere per 50 frames emitted from the surface.

I checked the copytopoint node in spreadsheet. It shows only one particle. I dive into the popnet and checked every parameters, didn't get the way to solve the problem.

Anyone can help me out? Thanks a lot.611db839a0461__9Y9D_1NXRYXWQL8HMK1B.thumb.jpg.5fa7d6dfc4136f7dc4160c2e2a110653.jpg611db8450f964_@SY7V_YQ2UOPFQ2H8.thumb.jpg.6aa164fa489f0983219f0cbde5489554.jpg611db85876f37__KQB28CYUML6GL9JEQJ6.thumb.jpg.614a9d9f9417583b101be4f372fcb7a5.jpg611db88a64bd9_TCQHYB)QS8QE2VYXW92GF.thumb.jpg.ccd99d7830ef711cef892a0236139c2e.jpg611db88413e29_QO(VN72JI3RU)IKL1BLGF.thumb.jpg.bc95c9d877c4cc1619ad510768bdf92f.jpg611db87f2c501_JYHGOKN)X6WSRO7Y.thumb.jpg.be5d6e6af6f023d53a95dbec6ffd0993.jpg611db87c2b6db_KS9EH1MSDP1E(SUL3NY.thumb.jpg.51d15536fea204a4b8dcf66a986abce0.jpg611db872e127f_SDTOZPM49@NPEP7T@JSN2.thumb.jpg.d08868f1af40686ec1e577d980f06b43.jpg611db86936ae8__GD(Q6QIGFU47P77CBM.thumb.jpg.c5a98a96b8ad12e9913bea4f3e4a67ee.jpg611db86291c13_C5I0X4KMJIJGG@KKJ8.thumb.jpg.40dd6f9ee3330ac3573e834bf7f3f20d.jpg

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I figured out that the global seed expression should be the problem. When it is $f/50, it will emit 50 particles, one particle per frame at the same place. When I changed it to $f/1, It will emit one particle per frame.

If I just want one particle during 50 frames, what the expression should be?

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