r/geometrynodes

Hi again.
Now the rain has persistent splashes that actually stay on impact...
I just need to delete after some time now, the problem is that I know about the "age" attribute, but I have no idea on how to implement it into my system.
The setup will be on the comments.

So this was more a way to understand the sort of processing required to get a CT type scan, rather than focusing on a cgi trick. So a CT scanner works by combining many x-ray images together in a way that lets you build 2d slices through the body.

To mimic this effect I first built a density grid for a hollow Suzanne. This was harder than it sounds because the various mesh to grid nodes get rid of the interior structure, so I reused a hollow check from my custom sdf tools and used that.

I then built a system where mesh lines would cross from point to point. Basically each point would sample the grid density and use that as part of a function to mimic absorption. I got some weird behaviour when using the grid sample value directly, so instead stored it on the point and then pulled it as a named attribute. Then I found the total loss along each mesh line and stored that.

I made a circle and then built the sampling rays between all of the points. I included several adjustments such as only sampling lines that weren't too short (to avoid sampling a lot of neighbours through empty space). I also set it so that every X point was actually an 'emitter', whilst the rest were 'receivers'.

I tried various methods to use the lines directly for visualisation before deciding instead to make a plane and have each of its points sample the nearby line points and factoring each of their total loss value. This then drove a shader.

Various signal cleanup steps:

I culled lines that didn't lose much.

I normalised values based on the max value recorded. It explains why some parts get brighter or darker suddenly. Because an area starts/stops being in the image.

Squared the normalised value.

I'm sure there's a whole bunch of other steps that would be realistically required for a real CT scanner software. I can get better images by increasing various values, but they tend to blow up the time taken, which wasn't practical for an animation.

Fabric Decorator is an all in one fabric detailing tool, it is a Blender Geometry Nodes modifier which brings your garments to life.
With this tool you can Draw sequins, stitches, pearls, gems, chains, buttons, and other intricate details directly on a still frame or UVs and watch them transfer to your final piece in real time with support for animated objects.

You can get Fabric Decorator on:

Superhive:
https://superhivemarket.com/products/fabric-decorator/?ref=8646

Artstation:
https://artstn.co/m/o9Wgm

Hi there, trying to figure out Geometry Nodes for this flower head and stuck on getting the outer florets to curl inward toward the center while the inner ones stay upright. My node tree so far is in the screenshot. Distribution + instancing + alignment to normals is all working, but the "bend based on distance from center" part isn't doing anything visible on the mesh. Newer to GN so wouldn't be surprised if I've made a basic mistake somewhere in the vector math. Any pointers appreciated.

Edit: Solved!

Hey everyone! I've been working on Segment Display, a Blender add-on for creating fully procedural segment-style displays directly in your viewport via the N-panel. It's powered entirely by Geometry Nodes and features classic 7-segment and detailed 16-segment alphanumeric models.
 
Numbers, alphanumeric text, clocks, timers, dates, customizable separators, LED and LCD appearances… all procedural, zero manual mesh work. Built for motion designers, 3D artists, and anyone who needs retro-digital elements (dashboards, sci-fi UIs, countdowns, speedometers, etc.).
 
Two editions planned: Segment Display Lite (free) and Segment Display Pro (full version). The add-on is currently in its final stage of development, not released yet, but I wanted to share some screenshots and a demo of where things are at. Feedback and thoughts are very welcome!
 
🔗 Visit orionnovemberstudio.com to see the add-on in action, explore its features, and subscribe for release updates.

🔗 YouTube Channel: https://youtube.com/@orionnovember.studio?si=ti0xhDXPELEp9Oxg

Problem illustrated here in red in a test render. Using Blender 5.2.0 LTS with the experimental Cloth Dynamics geometry nodes modifier.

Brain was fried a bit after the umpteenth time trying to learn geometry nodes, so today I was just having fun with some proximity crystal nodes and made some nifty stylized crystals material setup.

Just a tiny reminder to not just learn but play around with what you are trying to learn.

Edit: Just realized the image quality is crap so I reuploaded the screenshots in imgur

Made this procedural anime shockwave using Geometry Nodes in Blender! 💥

Full step-by-step tutorial on how to build the node graph here:

🔗 https://youtu.be/qjyoMhdhzs4?si=enIpKuDtdTV7k9yE

This is not a simulation-based system. Instead of using real physics simulation, it uses mathematical equations, vector fields, gradients, and random noise to create motion that looks like real physics.

It's a Blender asset Available https://fab.com/s/a8bda1af0a5a

I didn't think other building generators were powerful enough. Several days later, I have improved on this problem. It comes packed with features that I think are useful to populate dense urban environments. Let me know what you think, and if this is something worth making a tutorial on or providing access to.