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I've seen similar questions like mine, but I couldn't get their answers to work for me. Basically, I'm making a glass and I want a particle system to generate condensation on a specific area of the glass. I created a vertex group, but when I add the particle system, it doesn't seem to take the vertex group into account at all. However, it does seem to acknowledge my vertex group, but only when I negate it (so the particles spawn everywhere, BUT the vertex group. I don't know how to go about fixing this.

Vertex Group

Here is where I get lost:

Confused

I know my little collection of droplets isn't perfect, but that's a separate issue. I'm just trying to get them to emit from the faces in my vertex group. Any help is appreciated! I'll upload my .blend file shortly.

Thanks!

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Because vertex groups only consider vertices, not faces, so the influence of a vertex will extend until the next vertex:

enter image description here

We can see it if we switch to Weight Paint mode:

enter image description here

So what you need to do is create additional edge loops where you want the particles to stop, and make sure thay are not part of the vertex group:

enter image description here

Here is what it will give:

enter image description here

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  • $\begingroup$ Is it also possible to change the influence via weight painting? $\endgroup$
    – n0ah
    Sep 13, 2020 at 2:53

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