Question How to move particle around Shape:Circle

I creat a particle using set position:shape without set verlocity
Now i want all that particle move around that shape:cirlce ( on line of circle )
What should i do.

 

Well you know the radius and position of your circle, that's what you need. The block set position won't serve you anymore as it set a random position within this circle.

Then how to move your particle ? Here is one way :
- create a custom attribute called angularPosition
- initialize this custom attribute, either by computing it from the position in the circle but you need quite some math with Acos and Asin, or more simply set this value a random value between 0 and 2.PI and skip the Set Position : Shape block.
- update the custom attribute in time the way you want : constant angular speed or anything else.
- set the particle position according to this attribute : circleCenter + (radius*Cos(angularPosition), radius*Sin(angularPosition), 0)

 

Hi, I am using a node that is called "Set Position (Shape: Arc Circle)" because I couldn't find a better way to directly take influence on the circular position of the particles. I think that's here also your problem with that your dealing. How ever in my approach I am defining the position of the particles (in my case static and evenly distributed) by the parameter "Arc Sequencer" I think it goes from 0 (= Circle start point) to 1 (= Circle end point). So if you divide 1 by the amount of particles you want (lets say 4), and multiply this factor with the particles ID+1, you should receive a circle with evenly distributed particles around its center (1st particle right, 2nd: bottom, 3rd: left and 4th on the top). So now that you have a way to take influence on the particles position you can start to build up a more complex mechanism to steer the position of the particles. For example you could scale the above mentioned factor with an other factor that is increasing it by time.


( X, Y, Z defines only the center of the circle )