yujiyuji Posted November 21, 2020 Share Posted November 21, 2020 What Expression should I enter in Const Activation to birth points between frames 30 and 40? I attached picture to here. Please confirm it. Quote Link to comment Share on other sites More sharing options...
Alain2131 Posted November 21, 2020 Share Posted November 21, 2020 Hi there ! Let's break it down a bit, and start just by emitting particles from frame 30 To do that, we can use a comparison with the current frame "Is the current frame above 30" So this is really simple ↓ @Frame >= 30 // The equal to make sure that it is true as soon as frame 30 is reached This will evaluate as 0 before frame 30, then 1 at the frame 30 and after. For emitting below frame 40, the logic is the same, with the comparison sign changing direction @Frame <= 40 But you want above frame 30 and below frame 40 There is an "and" for this, the double ampersand → && So those two separate expressions becomes @Frame >= 30 && @Frame <= 40 Hope that helps ! 1 Quote Link to comment Share on other sites More sharing options...
yujiyuji Posted November 22, 2020 Author Share Posted November 22, 2020 Thank you very very much!! Quote Link to comment Share on other sites More sharing options...
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