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I have found Laser beam pathway with reflective mirrors - and I would like to run the example there:

Unfortunately, this is an example from some years ago, and I use Blender 2.92; so when I click Bake, and then click Play as recommended, I get this:

image

I guess those massive balls in the screenshot should be small particles? In any case, they seem to be not selectable with the mouse...

So I found how can I change the size of particles? - but that question is even older, and I have no "size" under Physics.

So, how can I control the size of the particles in that example in Blender 2.92?

sdbbs
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    Those are Billboard particles, and are not renderable in modern version of Blender as far as I know, so even if you managed to changed their size I don't think It would help you much – Duarte Farrajota Ramos Nov 11 '21 at 11:46
  • Thanks @DuarteFarrajotaRamos - never heard of Billboard particles before, but it makes sense ... Feel free to post this as an answer, I'll accept it! – sdbbs Nov 11 '21 at 11:51

1 Answers1

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Well...you can fake it...like this:

Turn gravity off, insert an emitter with just one vertex, insert some planes with collision and you get:

enter image description here

I am using a sphere as object here and give it some emission color.

Blend file:

With some HDRI and Bloom turned on:

enter image description here

Chris
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