Pixel Art Rain Shader

Date of Recording: 2020-11-30 Working on more environment systems, this time it's a rain effect. Selling the atmosphere of rain is a matter of layering together a bunch of individual effects: 1. streaks representing rain drops 2. splashes on all gently-sloped ground 3. spatter on the top edges of objects on screen 4. ripples in the water 5. mist blowing around the scene 6. randomized bobbing of the upward-facing leaves on trees 7. lightning flashes (with sharp shadows) 8. color grading Most of the effects are built on the GPU using a few tiling/looping textures and a single post-processing draw call, obviating the need to compute particle effects on the CPU or transferring buffers between CPU and GPU memory, making it a very lightweight effect to compute. The downside is that the effect does not show well while the camera is rotating.