explosion_fireball

The fireball shell of the builtin explosion. A unit sphere scaled to the blast radius, with ridged fBm from fx_noise eating the silhouette away as the blast ages and the colour walking white-hot → core → smoke over the same age.

Self-shading: an explosion emits its own light, so the body returns the finished pixel rather than handing the engine a surface to light.

Every per-play value — age, radius, seed, energy, the two colours and the emissive gain — arrives on the entity's own instance-data lanes, so one material serves every explosion on screen however they differ. The material's own core_color / smoke_color / intensity stand in until something writes the lanes.

Declares three float/colour properties and no textures or storage buffers.