Making a donut-shaped Particle emitter that emits inwards

Nanites

Hello,

is it possible to make a Particle emitter like this, with a "donut" shape that emits the particles towards its center? The idea is to have an effect as if the center is sucking the particles in, like a black hole.

I can make them spawn in the donut by loading an Emission Mask, but can't figure out how to make them move towards the center - all parameters accept one fixed direction/gravity, what I need is basically a gravity center I can put in the middle of the donut.

Calinou

For the emission itself: This is available in Godot 3.4rc2 thanks to the Ring emission shape. In Godot 3.3 and prior, you'd need to create a custom emission shape using the Points emission shape mode.

For the particle velocity: You can set the particles' Linear Velocity (or Linear Acceleration) to a negative value, while setting the particle gravity to 0.

I also have an example of a ring-like particle emitter in a game I made (open game/goal/goal.tscn in the editor).

Nanites

Your example really helped, thanks!

Got it to almost working, the only problem is now that the emission mask I import is not centered around the nodes origin, which seems to be where the particles are moving towards.

Is there a way to change the origin of a mask? Otherwise I guess I can wait for the 3.4 final release...

Calinou

Is there a way to change the origin of a mask?

I don't think there's a way to move all points at once, so you have to move them one by one using the inspector. (To make this easier, the inspector allows entering mathematical expressions such as 2+2.)