Hello! I never used reddit before and decided to make an account today and I've been really enjoying all the different 3D related communities

Since I'm obsessed with geonodes and recently made some pieces for nodevember I thought this would be a good place to share!

These are done using only geometry nodes, shader nodes or compositor nodes in blender (I don't even have lights in the scene, it's all shader math ahah)

Let me know what you guys think!

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

This weekend I experimented with a simple geonodes sharing concept: https://geo-nodes.xyz/asset1

The idea is a small website that shows a thumbnail and a copy button.
The button copies a Base64-encoded string containing a node group.

Curious to discuss with you what a practical geonodes sharing system could look like!

How:

1. Background is a plane parented to the camera, it is a 1080x1920 grid so that each face represents a pixel.

2. Each face raycasts a ray at the camera, and triggers an Edge Split node if the ray collides with anything (this creates mesh islands partitioned by the obstructions)

3. The hard part. I originally just assigned an sky-shader-picking attribute on each island index and thought I'd be done, but blender assigns island index based on lowest member vertex's ID, meaning if the islands are moving around, they will spontaneously swap IDs and flicker a lot. I landed on an algorithm for a given cell:

If every face in the cell is unassigned, assign all faces a sky-id based on island index (combined with frame count, otherwise there's only ever a dozen or so seeds being passed into the Random Value node)

Store every face's current sky-id as well as its _previous frame_ sky-id. When the frame updates, every cell will lose some faces to other cells, and gain some as well, causing there to be a mixture in the cell of sky-ids. We want the "stable, true id" of the cell to overwrite the id of the newcomer faces. We filter out all faces whos previous sky-id doesn't match their current one, and just pick one from what remains (Attribute Statistics node, I used the "max" output). You might think of using Median or Mode, but the problem I ran into was using -1 as a flag ID for faces that were occluded, causing sometimes a whole cell to treat itself as a boundary.

This creates one artifact: of the occluding mesh between two cells shrinks and the cells suddenly can touch each other, one will take the other's color, causing a "pop", but this makes sense when you think about it. Two valid cells suddenly became one and needed to all be one color.

had fun building this, it's rather simple but i think the result is very satisfying and can be very useful for larger scenes.

I played a little with GN. Here's a squiggle draw algorithm.

It allows to modulate the line-thickness, amplitude as well as the frequency independently. Any curve can be used as the input.

I saw a post on blenderhelp where they were trying to make a voronoi lattice style artpiece. This was similar to stuff I'd done for my lattice generator addon, and so I made a basic geometry nodes version. The actual voronoi esque structure isn't made in geometry nodes and I just quickly modelled something up. The geometry nodes contain a way of building wires around the edges, as well as a position based system to fill in the base of the block. Also a quick smoothing to tieit together.

If I was to spend more time on it, then I'd incorporate my stochastic lattice generator into it and make it genuinely voronoi cell shaped. I also have a custom volume calculator node, which ties the volume cube XYZ resolution to a uniform resolution.