flowchart LR
    boxes["13 boxes<br/>one cube, instanced"] --> shadow["1. shadow pass<br/>depth only from the sun<br/>1024² D32, depth bias"]
    boxes --> scene["2. scene pass<br/>Lambert + ambient<br/>PCF shadow lookup<br/>FP16 target, D32 depth"]
    shadow -->|"R32 SRV"| scene
    shadow -->|"R32 SRV"| march["3. compute pass<br/>48 dithered samples per ray<br/>shadow test at each<br/>Schlick phase"]
    scene -->|"depth as R32 SRV"| march
    scene -->|"FP16 SRV"| post["4. fullscreen pass<br/>scene + shafts<br/>c / (1 + c), gamma 1/2.2"]
    march -->|"FP16 UAV → SRV"| post
    post --> out["640×360 RGBA8"]