Atlas Clean Plate Stack 🧽 (up to 4 plates + alphas)

If you're a matte painter who does the classic thing - separate the plate in Photoshop into sky / mountains / buildings / road, save each stratum as a full-frame plate plus an alpha - then Atlas Clean Plate Stack 🧽 is the node that turns that pile of PNGs into a layered 3D scene in one shot. It's the multi-slot injection port: up to four plate+matte pairs, each becomes a depth layer, and out comes a solve whose projection stack is ready for the viewport and the DCC exporters.

How the slots work

Slot 1 is the FARTHEST stratum (far_sky), slot 4 the nearest (foreground). Priorities are assigned farthest-highest - 15 / 10 / 5 / 0 - the same seam doctrine as AtlasCleanPlateLayer. And the DMP seam rule is baked in: every used slot except the nearest gets the edge_extend_px smear, while the nearest keeps a clean cut. The smear keeps the behind-layer edges from showing as dark or transparent gaps when the camera moves; the nearest layer doesn't need it because nothing sits in front of it.

Each slot has a name_* (what it's called in the export) and a geometry_* pick - card for the far sky (a flat backdrop, never tears), relief for anything with real shape, ground for flat horizontal surfaces. The defaults are sensible: far_sky as card, everything else as relief.

Under the hood it's pure composition over AtlasCleanPlateLayer - the stack node adds no new math, it just orchestrates four of them. Per slot: the matte is grown by grow_px (12 default), its inverse becomes the geometry's exclusion mask, and the raw matte becomes the paint layer's edge matte.

The one gotcha that will trip you

mattes_are_transparency defaults to off, and the wiring hint in the source explains why: ComfyUI's LoadImage MASK output marks transparent pixels, not opaque ones. If you save each separation as a PNG with alpha and wire one LoadImage per slot (IMAGE → plate_N, MASK → matte_N), flip mattes_are_transparency ON - or pre-invert each mask with InvertMask. Get this backwards and your mattes are inverted and the layers vanish. It's the single most common miswire on this node.

Everything else

relief_grid (384 default) and depth_edge_rel (1.5) control mesh density and tear sensitivity for the band meshes - the defaults are the empirically-calibrated band-layer settings. A slot missing a plate OR a matte - or with an empty matte - is skipped and named in the report, never an error. With no complete slot at all, the input solve passes through untouched.

Inputs: solve and depth required; outputs are the updated solve and a report listing which slots were used and which were skipped. Needs the [neural] extra for the metric depth the layer meshes are built from - without it the node fails soft with an explanatory report rather than breaking your graph. Install is the pack's usual clone-and-go.