storm_puff

Alpha-blended smoke puff on a camera-facing card (zero_billboard), with wispy domain-warped edges, a sooty body, blue-white flash lighting and an ember glow while it is young. A domain-warped four-octave value noise, drifting with time and offset by the seed, erodes a round body. The puff fades in over the first 10 percent of its life and out between 0.45 and 1. Its dense core reads as soot (0.030, 0.034, 0.045) and its thin edges pick up a slate sky (0.13, 0.15, 0.20), scaled by ambient. The storm's flash adds blue-white (0.62, 0.70, 1.0) light times flash * flash_gain, and the heat lane adds an orange ember glow (1.0, 0.36, 0.06). The alpha is the body times the fades, the lane's opacity scale and density.

The storm graph (storm/storm.procGraph) draws its smoke output with it (transparent, flash from the storm schedule's flash expression, flash_gain 1.7, ambient 1.0, density 0.8): smoke rising from every strike, dragged downwind and billowing as it ages. The graph writes data0 as (life, a random seed, a heat ramp that falls from 1 to 0 by 0.28 of the life, 0.85). In the Procgen Effects Showcase world, the fx_storm scene plays the graph.

The shader includes @builtin::shaderModules.billboard.

Properties

Lanes