{
  "version": 3,
  "created_at": "2026-07-10T04:51:25.748Z",
  "task_summary": "Render the T-cell three-fate animation on a Modal cloud GPU",
  "agents": [],
  "phases": [
    {
      "name": "Plan",
      "delegations": [
        {
          "steps": [
            {
              "title": "Obtain the saved .blend file",
              "description": "You save the scene in Blender (Ctrl+S) to Downloads. I request read access to ~/Downloads, copy the .blend into the workspace, and verify it opens: inventory objects (cells, receptors, wheat_pmhc, *_NP_Core, *_NP_*_pMHC studs), confirm frame range 1-420, resolution 1920x1080, engine CYCLES, and that the animation/constraints are present. Produces a short scene-audit printout confirming the file is render-ready."
            },
            {
              "title": "Build a Blender 5.1.2 GPU image on Modal",
              "description": "In the compute_provider kernel, build a Modal image from an NVIDIA CUDA base: download the official blender-5.1.2-linux-x64 tarball at build time, install the system libs Blender needs headless (libx11, libxrender, libxi, libxxf86vm, libxfixes, libgl1, libsm6, etc.) plus ffmpeg for encoding. Record the resulting im-... image ref and append an env ledger block to compute_details so it's reusable. Deliverable: a working image ref plus a printed `blender --version` == 5.1.2 from a CPU smoke probe."
            },
            {
              "title": "Smoke-test render: 1 GPU frame",
              "description": "Upload the .blend and render a single heavy frame (~frame 200) on one A100, forcing GPU device selection via a --python snippet (enable OPTIX/CUDA devices, set cycles.device='GPU'). Harvest that PNG and visually verify: cartoon A/B + sticks P styling on the pMHC studs, iron-oxide NP cores, NPs docked to cells. If styling is missing (MN node groups need the addon), fall back to installing Molecular Nodes into the image and re-test. Deliverable: one QC still frame confirming the scene renders correctly on GPU, plus a measured seconds/frame to size the full render."
            },
            {
              "title": "Choose render settings from the timing",
              "description": "From the smoke-frame timing, decide samples (keep 256 if fast enough, else drop to 128 with denoising) and whether to split the 420-frame range across multiple containers for wall-time. Document the chosen settings and estimated total time/cost before committing. Deliverable: a one-line render plan (samples, resolution, container count, est. wall-time)."
            },
            {
              "title": "Full 420-frame render on GPU",
              "description": "Render frames 1-420 at 1920x1080 into the container, writing PNGs to a scratch dir (NOT ./out/, to avoid harvesting ~1GB of frames). Checkpoint progress periodically. If parallelizing, submit N handles each covering a frame sub-range. Deliverable: all 420 frames rendered on the remote, with per-frame progress logged."
            },
            {
              "title": "Encode to MP4 in-container and harvest",
              "description": "Run ffmpeg in the container to encode the PNG sequence to H.264 MP4 (30fps, crf 18, yuv420p for broad compatibility). Copy ONLY the MP4 plus ~3 sample PNGs into ./out/ so the harvest stays small and fast. Harvest back to the workspace. Deliverable: tcell_threefate.mp4 + sample frames pulled into the workspace."
            },
            {
              "title": "Save deliverables and clean up",
              "description": "Save the MP4 and sample frames as artifacts, embed the samples inline, and close the Modal handle(s) so no container bills idle. Confirm the env ledger block is recorded for reuse. Deliverable: final MP4 artifact + QC stills, containers torn down."
            }
          ]
        }
      ],
      "id": "phase-0"
    }
  ],
  "desired_outputs": [
    "Final H.264 MP4 of the 420-frame animation (1080p, 30fps)",
    "A few sample still frames (PNG) for quick QC",
    "Reusable Modal Blender-render setup (image + submit recipe) recorded for next time"
  ],
  "feasibility": {
    "rationale": "Blender 5.1.2 Linux build is available to match your file version, and Modal can run headless Cycles on an A100 GPU far faster than the local M1. The key dependency is your SAVED .blend file (the scene isn't reproducible from the script alone). Main technical risk — whether the Molecular Nodes styling renders without the addon installed — is caught early by a 1-frame smoke test, with an addon-install fallback if needed.",
    "confidence": "medium"
  }
}