this post was submitted on 03 Jul 2025
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[Help] How can i give an object frayed or disintigrating edges? (lemmy.world)
submitted 1 week ago* (last edited 1 week ago) by [email protected] to c/[email protected]
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A scene i'm trying to make includes a hole in the sky that i'd like to have disintegrating edges, as shown here. I should only need one angle on this scene so i don't need something that's pretty from every angle.

Here's what the scene looks like currently, with a filled black circle for the hole.

And here's roughly what it should look like.

I used GIMP's pick and blur filters to do this, but i'm curious to know if there's a good way to get this same effect straight from Blender. What are my options here besides editing the picture every time i update the scene?

Thanks in advance.

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[–] [email protected] 3 points 1 week ago

Use an alpha for your texture; place it on the circle. see how to add alpha to your blender textures, there are a million tutorials out there

[–] [email protected] 2 points 1 week ago* (last edited 1 week ago) (2 children)

I'm a novice, so I'm sure there's probably a better way to do this, but I would probably make a 2d shape that I can move around and scale. Here's what I would try:

  1. Create a circle with an even number of vertices, like 32
  2. In vertex selection mode, checker deselect. (Select > Checker deselect)
  3. Scale just those points outwards a little bit
  4. Bevel the vertices (Ctrl + Shift + B) and use the mouse wheel to create three points. Make them more or less evenly spaced. It should look like a cauliflower
  5. Select all vertices
  6. Repeat steps 2 through 5 a few times. It should start to look like a carnation
  7. Using circle select tool (C, mouse wheel adjusts radius) pick just the inside vertices. There should be 16.
  8. Turn on proportional editing mode and set it to random (squiggly line)
  9. Scale those points in or out, playing with the radius using the mouse wheel. The deselected points will move random distances, giving a jagged/fuzzy look. You can get a lot of variety if you play with the radius.
  10. Select all points and hit F to fill.

Here's how mine turned out.

[–] [email protected] 3 points 1 week ago

One more idea, this time in 3d:

  1. Create an icosphere with maybe 6 subdivisions
  2. select just one vertex
  3. Use the same random proportional editing tool to randomize the surface radiating away from the selected vertex
  4. Set a material and use a diffuse black shader

As a bonus, you can have the object rotate to give it an animated, portal-like look.

[–] [email protected] 2 points 1 week ago

I tried this and it kept adding extra faces to the spikier bits. For now i'll stick with GIMP. Thanks anyway.