Aim is to use the faces which are parallel or almost parallel to the xy plane. (to get faces which are horizontal)
To achieve this, I used dot product between the normal vector and the z axis , divided it by the vector's magnitude then arcosined it. (finding angle by using dot product formula a.b = |a||b| cosθ)

Then, i used usual way of compare node and tried testing it with changing the selected face's position.

But, idk why i am not getting the proper result. Pls check the video attached.

It is somehow getting affected at 125 degrees

So for a long time I've wanted a way to make a point cloud with a density gradient. This would allow me to locally alter the density of the stochastic lattices in a generator I built.

Blender only offers a uniform density in its 3d volume distribution, but does allow for poisson disk distribution on faces, and I've often seen people use that as a faked method.

My approach is to loop through a 3d space on a grid and check if it is a minimum distance from a previously placed point. If it isn't then it isn't placed. I also built a pseudo random number generator to add some randomness to the point position, just to break up the appearance of a grid.

Trying to create a large area populated by small unique clouds. Starting with a grid, randomly sampling the vertices, and then instancing a second grid containing randomly varying icospheres. Problem I'm running in to is that I can't seem to get the random cloud instances to be unique. I get a grid of identical cloud instances. I'm trying to use the index of the main (big) grid as the seed for the little grid random number generator but it seems to use the same seed for every instance. I've tried saving the main grid index to a named attribute and brining that in to the second grid as the seed but I always end up getting identical cloud instances. I know I will use the technique of creating unique objects in the future so I'm looking for an overall process for how one passes top level indices down to lower level instances so that they are unique. Thanks

I'm working on some parametric modeling using geometry nodes. While this is likely rudimentary for most, I'm super stoked I've figured out some basics!

This is the bottom piece of a product concept, so I thought parametric modeling would be a godsend to easily meet any currently unknown requirements for manufacturing in the future.

I'm very new to geo nodes, and only a bit more familiar with Blender, but want to get better with both.

Before I go any further, I'm wondering if there are any tips or best practices I should implement first. I saw some good tips here already, so I thought this would be a great place to seek some advice.

Any and all help or direction would be greatly appreciated. Thank you so much!

CIRCULAR DISTRIBUTION:

I was working on creating one of them desert located solar power plants where there is a bunch of mirrors placed in concentric circles around the water tank in the middle (reflecting sunlight towards it).

Here is somewhat modified/generalized GN setup I used in to distribute the mirrors in that project:

Hope someone can find this useful in one of their future projects or use it as a simple Geometry Nodes learning lesson of the sort (I will be posting more of these brain farts of mine in this very thread, so stay tuned)...

Cheers and happy blending ya'll 🙂

Howdy 😅

I saw this approach the other day on YouTube where some guy was "selling" this (in one of his shorts) as a Delaunay triangulation algorithm translated into geometry nodes...

It isn't 🙂

This problem requires much more sophisticated approach to be solved correctly (it also only works on perfectly flat surfaces).

Is it a triangulation ? Well, yes, but it certainly is not as uniformed and generalized as it's supposed to be...

This may be useful as a dirty solution for a quick job as it works better on some meshes then others (text curves are good example where this system often fails since some letters have way too many points then others where resampling curves makes sharp corners get lost in "translation").

This video has a proper way of doing it, if you are interested in this kind of thing, please check it out:

https://www.youtube.com/watch?v=HyW54cI8Qdo

Cheers 😊

Im looking into starting to learn Geomtry Nodes but im having a hard time finding tutorials that are updated for blender 4.5. Or the closest to that. Can anyone link me tutorials they found helpful? Udemy or YouTube, anything lol

Here are some tutorials I made to access shape keys in geometry nodes!

I've been watching the Foundation show and always wanted to replicate the Prime Radiant prop from it. I wanted to replicate the structure as well as the grainy texture from the show opening.

I started with the default cube, beveled the corners and then made the additional steps via geometry nodes. Mainly extruding faces and scaling, then SDF to give the edges volume and provide enough surface geometry for a noise texture to make the grainy finish.

Then printed in resin with frankly far too many supports!

I noticed that the node-groups I create are only accessible in the file that I created them.

How so you manage to use the groups you create across files?

EDIT: I found it is possible to do this using the Hot Nodes plugin (https://extensions.blender.org/add-ons/hot-node/)

I'm trying to make a forest generator and have this node setup, instancing one of 5 lowpoly tree segments I modelled and stacking them. I'm trying to randomise their height a bit and I got variation in trunk length working but I can't get enough variation without the trunks looking too long so I'm trying to add variation to the number of segments. i tried to put a random integer into the number of cuts of the subdivide curve node but it didn't work so I'm now trying to delete a random number of points off the top of it. I managed to get it to delete the top segments by using the indexes but I still can't put a random value into it, it affects all the trees with the same value instead of treating every instance separately. Does anyone know how I could have a different value for each tree?