cloister_glow

A soft additive sheet with two jobs in the cloister: the pool of warm light a shaft lays on the wet floor, and the low banks of vapour drifting through the hall. Radial falloff from the middle of the quad's UVs, broken up by slow world-space noise so neither ever reads as a clean circle.

falloff and core shape the profile, mottle breaks it, face_fade fades the sheet as it turns edge-on to the camera (which is what keeps a vertical vapour bank from showing its own edge). Premultiplied with alpha 0 — it adds, and occludes nothing.