Can I achieve the convolution bloom effect for a light source without the convolution bloom?

[ZacD]

You’re going to have to do more than just a billboard with the shader.

There’s tricks like this

Doom 3 – Volumetric Glow | Simonschreibt.

Any idea on how to recreate dooms volumetric glow with vertex shader?

Hi there, because there is no (cheap) bloom for mobile without mobileHDR I am searching for a low performance alternative. Some years ago I stumbled upon Simons Blog and his analysis of Dooms volumetric glow: Doom 3 – Volumetric Glow | Simon schreibt. And someone implemented it with a breakdown in his game: Yzer development picture dump (yzergame.com) [wireframe] But my goal is to not rely on game code to update the vertices, but instead have the vertex shader push around the vertices. Maybe…