Three steps. Same browser. Pixel-perfect output.
Use the same pixel editor you already know — brush, eyedropper, mirror, palettes, frame timeline, layers. Mirror H/V/quad reflects depth + placement alongside colour.
DEPTH tool (D) sets per-pixel thickness — each pixel becomes a stack of 2N+1 cubes. PLACEMENT tool (P) slides that stack forward / back along Z for overhangs, ledges, undercuts. Every visible layer is its own 3D object — higher layers override cubes lower layers would draw at the same coord. Floating 3D preview rotates live as you paint; full Model View orbits a three.js scene.
glTF (.glb, per-color materials baked in) or OBJ (ZIP with .obj + .mtl + per-frame palette PNG via map_Kd). Multi-frame projects open a per-frame picker. Drops into Unity URP Lit, Godot 4, Blender, Three.js — no shader setup.
Same sprite. One painted, one forged — drag the 3D model to spin it.
No download, no install. Free starts at 16³ and Pro raises the ceiling to 64³ — paint a character, a tree, a chunky low-poly weapon, and export the .glb in under a minute.