GPU-Fog-Particles: Textureless fog particles using a highly customizable shader to attenuate noise values.

The technique is the use of surface depth and camera fading. The opacity of the mesh will fade away when near rendered geometry and as the camera approaches. These values can be tweaked to give a fake volumetric effect to what are otherwise just flat / billboard particles facing the camera.
Surface depth fading in this case is commonly known as "soft particles".

https://github.com/MirzaBeig/GPU-Fog-Particles

#fog #softparticles #vfx #camerafading