Hi Everyone, I hope you are doing well! I was curious if there was a clever way someone has thought of to have a glow effect to LineBasicMaterials without using bloom. In my project, numerous lines simultaneously will be doing animations, thus I am worried about the performance issues if I were to …

bloom is a fixed cost since it’s a screenspace effect. if you render 1 line with bloom, or a 1000, the bloom should take the same amount of time. if you reaaally don’t want to use bloom, you might be able to use quads to draw lines and apply some kind of texture to them, and render them with additi…

Hi @manthrax , Thank you for the response! If I were to apply texture to multiple lines with additive blending, do you think the performance would be better than bloom? I am mainly just concerned about making this work on mobile or low end laptops.

well… its complicated. an even more performant approach would be to use a custom shader instead of a texture… but the logic isn’t trivial. If you use a purely texture based approach, you would have to render each line as 3 quads.. one for the interior, and 2 more for the end caps (miter)… With a s…

In summary.. yes you can probably make lines that are more performant than hardware lines + a bloom pass, but the implementation complexity is very high. Also it will potentially be less dynamic than just using lines+bloom, and require more work on the cpu to generate the geometry. (if you’re aimin…

Thank you for the thoughtful response, I appreciate it! I was actually thinking about creating a custom shader worst case scenario over the next week, but really wanted to hold off on it if I could and gain some inspiration here. I will most likely play around with bloom more and worst comes to wors…

I don’t know if this helps, but I was also considering creating lines with bloom a few months ago. Here is a WebGPU example, I created using r167.1. The line on the left uses bloom, the line on the right does not. I was trying to create lines that stood out against both light and dark backgrounds…

@PavelBoytchev has demonstrated a technique to do this with standard meshes previously How to add a selective glow effect that works with dark colors too? - #2 by PavelBoytchev there’s the possibility of replicating something similar with lines, however this would have it’s own cost of having to ren…

Glow Effect to LineBasicMaterial Without Bloom

Questions

PavelBoytchev June 21, 2025, 11:10am 9

Careless about performance issues, just for the fun of it, I’m just passing by and dropping this in:

https://codepen.io/boytchev/full/YPXJgLd

And I promise to never code drunk again.

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Glow Effect to LineBasicMaterial Without Bloom

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