How can I get this kind of shuttered glass effect in Unreal or Substance Painter?

SwordOfPeace

I'm trying to achieve the exact same effect seen in the left corner. I have cracked glass pieces modeled similarly, but my technical art side not strong enough to find correct way to do it. I’m struggling to figure out how to get this result.

Eric Chadwick

Here's something I made that might help. It's a bit stylized, but the idea might help you.





Interactive demo:
https://github.khronos.org/glTF-Sample-Viewer-Release/?model=https://raw.GithubUserContent.com/KhronosGroup/glTF-Sample-Assets/main/./Models/GlassBrokenWindow/glTF-Binary/GlassBrokenWindow.glb

Some explanation, and you can download the model here too:
https://github.com/KhronosGroup/glTF-Sample-Assets/tree/main/Models/GlassBrokenWindow#description

SwordOfPeace

Thank you! I assume this one uses a flat plane for the window, but I got the idea. I’m using a thin box as the window and applied a Voronoi fracture for the broken parts. After creating a good glass material shader in Unreal, I can add an alpha texture like this in Substance Painter for more detailed effects. Thanks again for your response!

Eric Chadwick

Yeah, it’s a plane, only two triangles. To make the textures I used a voronoi fracture system, tweaked the rotations a bit (for a better normal map) then baked it out to textures.

SwordOfPeace

Thanks a lot! I'm planning to use a thin box geometry. Will this technique work the same way?

Eric Chadwick

Try it and see! I imagine it will work, but you’ll likely have to tweak things.

SwordOfPeace

Hey! Thanks again! Your example helped me a lot, especially the metallic part on the edges. Additionally with a little edge wear made huge difference!
What you think?

Eric Chadwick

Nice job! What's it look like close up?

SwordOfPeace

It's from Substance Painter and currently looks like this. I'm trying to achieve the same look in Unreal, but after many attempts, I still couldn't figure it out. I want to create an optimized shader for the glass and aim to use a single material for the entire window. I've gotten some results using dithering, but I'm not fully satisfied. Do you have any recommendations for this?
In Unreal with dithering

poopipe

Any reason to not separate materials and use a translucent material?  

Dithered clip is better than undithered clip but unless you've got a very good reason to not use an alpha blend  I don't see why you'd choose it. 

SwordOfPeace

For my portfolio presentation, I was obsessed with keeping the shader complexity as green as possible, but maybe I was being overly meticulous. Before seeing your comment, I decided to follow the approach you mentioned and separated the materials. Now, I'm using translucency and have achieved a look that's quite close to what I had in Substance Painter.

poopipe

Adding a little bit to the bottom of the artstation page about your testing / investigation into the dithered clip would make your portfolio a bit more interesting than most. 

SwordOfPeace

I'll keep that in mind, thank you!