hi @cuinjune . thanks again. i think i almost have the solution. its very straightforward, if you know how to do it i hope its not that expensive anymore. i just need to adjust the position os the two shapes correctly, like you mentioned. here is the patch: lissa-particle2.pd edit: i think it works now, i will upload the patch when i cleaned up and solved some small errors.

@cuinjune here is the updated patch, everything seems to work fine so far. do you know if there is a simple way to change the color of a single fbo drawing of @JonasPath3 (one of the small blue elements)?
lissa-particle9.pd

@Jona Hey, It looks so beautiful!
First of all, you are not currently using fbo for drawing small blue element.
[ofCreateFbo] exists in the main canvas but you are not drawing the fbo since I can't find [ofDrawFbo] from your patch.

I modified your patch main.pd to show you how you can write @JonasPath3 to @fbo1.

It should look like this when drawn correctly.

I don't know if the result is what you wanted but I needed to change the blend mode when writing to fbo. If you use blend mode(other than ALPHA) when writing to fbo, it can look different than the original drawing because the background color of the fbo is also blended.

Also, your patch seems to load meshes every frame although it doesn't seem to change every frame. For example, from the patch I uploaded you will see the drawing of @JonasPath3 is written to @fbo1 once on startup, so if you're not going to use @JonasPath3 any longer(because you already have it in fbo), you don't need to load the mesh anymore.

Of course, there won't be a big difference if your patch is small, but it is a good practice to get rid of unnecessary overheads.

And regarding changing the color of one element, you can change the color when drawing 'n'th element in a loop. You just need a condition in a loop.

Here's a patch which I color only 30th element differently. main.pd
Since fbo is already colored blue, using [ofSetColor] will not totally re-color it. If you want to totally re-color elements, I think it would be easier to directly draw @JonasPath3 like your original patch.

@cuinjune thanks a lot again. in the beginning i had the visualization of a sequencer in mind (that i tried to realize with pure data data structures), but i have to admit i am a bit overwhelmed by the open frameworks/ofelia possibilities, so i am also playing around and need to be careful not to get lost visually just tried numbers.
haha, thanks for pointing out that i didnt use the fbo at all but loaded it every frame - and fixing and explaining it. i am still learning.
also the coloring works very well
lissa-particle_with_numbers.pd