They say there are only so many things you can watch forever, and one of them is fire burning, so indie game developer fraduss is on the right track with their cool flame effect.
The developer created this paper burning system for their game using shaders and VFX in Unity. According to fraduss, the flame spreading is entirely mesh-based, its quads are “rotated toward the camera using a simple logic (their pivots are at the bottom center of the quad). So when you rotate the paper, the flames will still appear to rise upward.”
It burns in a specific pattern based on the mesh shape provided by the developer.
Source: 80.lv