# Globular Cluster Particle Distribution Help

I'm trying to make a globular cluster in blender. Here's an example image of what I'm trying to make using a sphere, particles, and (if needed) geometry nodes.

At the moment, I have a geometry nodes setup that looks like this. I was unable to find a way to get particles inside the sphere. So, I filled in the sphere since it seems the particles are dependent on where the spherical mesh is. I also made the particles not be Newtonian. However, I want my sphere to be more densely packed in the center compared to the edges (like in the image above). I also want to make each of the particles glow like a star in blender (I know how to do it with standard objects via compositing and material nodes, but I don't know how I could make that work here) so that it looks like a globular cluster.

I'm now trying to add color and glow to my objects so that they act like stars in my globular cluster. However, I'm struggling to put color or a glow for the each star.

Welcome ProximaCc, first you need a vertical edge.Then you subdivide it and you instance on each point a plane with the same subdivision (a volume cube of vertices).

You realize the instances and delete every vertices out of a sphere for this you use a Geometry Proximity based on the center point, and a Greater Than Math node the you instance your center point on the sphere.

Now you have a volume sphere. here in order to displace the point you use a Noise Texture, The Vector Math Scale control the influence of your noise, as you need something more packed in the center you can control the scale with a Math node Power (negative power work find) link to the Geometry Proximity you used before.

I hope it help.

Edit: My bad, in order to add a material instances should be a mesh, also you have to plug a set material at the end:

The new .blend.

• Thank you so much for your reply! This was very helpful! I was able to get good proportions for my globular cluster so that it has an end with just a few particles on the outside. This may sound like a simple question, but how would I make the particles glow? I tried using the material panel but wasn't able to make the particles themselves glow like stars. It would also be wonderful if I could get the stars to be different colors so they can, after compositing, glow in different colors. Commented Dec 26, 2022 at 6:19
• Those are two different questions one for the colors, you can look out this: blender.stackexchange.com/questions/282121/…. For the glow there is that: youtube.com/watch?v=Tu3U6wD7lu4 Commented Dec 26, 2022 at 7:24
• I've tried to do both using the methods. However, when I render them, no color or glow is shown. I put a set material between the Realize Instances and Delete Geometry Nodes to add color. Commented Dec 26, 2022 at 15:38
• I have edit the .bend and the post you should be able to do it... Commented Dec 26, 2022 at 15:57
• I just added two more images to show you where I'm at Commented Dec 26, 2022 at 15:58

Treating this as a geonodes project, I think this is how I would build it, taking advantage of Mesh to Volume.

This generates the point cloud, and it has a good bit of parametric control over density:

Make a material for the stars, spend as much time here as you want, because I think you have your work cut out for you. Different colors have different apparent brightness and it'll affect your compositing experience. I kept it super simple.

I instanced a simple icosphere for my stars, giving them some random size

Then you render and you're into Compositing

In this particular example, I noticed there was a lot of green glare, and found that by modulating that channel a bit I could get some pretty good effects.

Obviously there's a lot to improve here, but that's an example of one flow.