How to use image sequence to control particles? I have image sequence that I want to use to control particle spawn area.
Image sequence is black and white mask in nature. It depicts a moving disc:

When I try to use the same sequence to control particle spawn with the &quot;Density&quot; controller, I get very wacky results. They seem fine in viewport as you will se in the gif below, but in render results are wrong.

Render of the same scene, does not look like a viewport result

Here I made a gif of my process (20mb): https://drive.google.com/file/d/1-GA9eF6biSXK4Nv2on2QecZgIRAdwrOS/view?usp=sharing
So how do I control particle spawn with the image sequence the right way?
Unfortunately blender can't pack image sequences in to file, so i put my blend file and image sequence here: (1.3mb total) https://drive.google.com/drive/folders/1CcxzUDwEFGFghC-nYHWwr8zidshfLb7y?usp=sharing
You are lucky more than me :) I got particles emitted only from a one frame (tested with 2.79, 2.83, 2.93 and according to this answer and its link to devs (also seen as closed bug report with this topic in 2017) ... seems like limitation persists. So what you see in your preview is a pure love of God :)
So ... seems like the only one option to control animation with texture is to translate animation into a gradient image.


To prevent release from black pixels I used image with transparency (PNGA). For some weird reason I had to set Alpha &gt; None to let it work as intended.
To get a bit of randomness of release apply a Noise filter on image



I know you said your example is just a prove of concept, but probably you would be able reuse for your needs as well.