accepted

Native WebGPU Dense Grass

This report separates published implementation state from accepted evidence. Every value below comes from the schema-v2 registry, the emitted source manifest, or promoted same-lab artifacts.

Open demo Owning skill Published source manifest Registry JSON Promoted evidence summary Tracked v2 bundle manifest Canonical source

Lab id: webgpu-dense-grass
Kind: Canonical Lab
Owning skill: Procedural Vegetation
Execution: rendering
Three.js: 0.185.1
Source hash: sha256:588a351cf985a1cbc55b7192354f2e1b61572d70c61ad41b408c73888b017fc6
Published bundle hash: sha256:769958f85b1023291ec86bdc5561b14abd7d57b4e371749e64bf122a6dcef333
Build revision: sha256:348d7584a398e339bdf08ac952ded6eb67b5ed813416a6fe3ba445615164b63a
Renderer: WebGPURenderer
Backend: WebGPU
Evidence contract: v2
Tracked release bundle: Present

Claim verdicts

visualCorrectnessINSUFFICIENT_EVIDENCE

mechanismCorrectnessPASS

performanceComplianceNOT_CLAIMED

gpuAttributionNOT_CLAIMED

lifecycleStabilityPASS

visualErrorPASS

Promoted same-lab media

Native WebGPU Dense Grass: Final design presentation — **Final design presentation**inspected-runtime-evidence-preview · sha256:49b02d5351a9a14d594ee5b85a13a5adb646142dae8af2242da0d3faa96d61ef

Native WebGPU Dense Grass: No-post / baseline presentation — **No-post / baseline presentation**inspected-runtime-evidence-preview · sha256:105863b95333d3b3669b6d1a0a104b5a2fe2cf82eeac5be5b8402bfad937930b

Native WebGPU Dense Grass: Diagnostics mosaic — **Diagnostics mosaic**inspected-runtime-evidence-preview · sha256:55ff42c75c4dc29fdf6bd9b538d8074407b9096e19c2f0c93dcac57c44800887

Native WebGPU Dense Grass: Near camera — **Near camera**inspected-runtime-evidence-preview · sha256:028213ab66540c3c40507486fe4ec8168024b6e87672275dd0252913c78d0170

Native WebGPU Dense Grass: Design camera — **Design camera**inspected-runtime-evidence-preview · sha256:49b02d5351a9a14d594ee5b85a13a5adb646142dae8af2242da0d3faa96d61ef

Native WebGPU Dense Grass: Far camera — **Far camera**inspected-runtime-evidence-preview · sha256:cd272a519f15c1a35c3d6c6475b15681dc847ccb34a914f5e5b63d1bf92359eb

Native WebGPU Dense Grass: Representative seed final — **Representative seed final**inspected-runtime-evidence-preview · sha256:49b02d5351a9a14d594ee5b85a13a5adb646142dae8af2242da0d3faa96d61ef

Native WebGPU Dense Grass: Stress seed final — **Stress seed final**inspected-runtime-evidence-preview · sha256:cf683f356ae70a8c64019225efe629e1aabf15f37de4768846a33981c750f154

Native WebGPU Dense Grass: Temporal t0 — **Temporal t0**inspected-runtime-evidence-preview · sha256:49b02d5351a9a14d594ee5b85a13a5adb646142dae8af2242da0d3faa96d61ef

Native WebGPU Dense Grass: Temporal t1 — **Temporal t1**inspected-runtime-evidence-preview · sha256:eba9e5d4ad460e4489ebc8d7e1374fad24b152cdc30781c903187efe64a9fb88

Required capability and runtime proof

Capabilities

native-webgpuaccepted

capture-session WebGPUBackend device identity + raw-capture-session evidence-manifest validates under current sourceHash.

storage-computeaccepted

dense-grass static placement compute contract exercised by unit validation; storage ledger residual for full acceptance promotion.

Runtime proof

render-target-readbackaccepted

aligned RGBA8 final/no-post/diagnostics and camera/seed/temporal readbacks in correctness package.

storage-ledgeraccepted

LabController.describeResources available at capture; dedicated storage binary ledger residual.

spatial-lodaccepted

validation.js quadrant occupancy gate (unit); physical LOD capture residual.

renderer-initaccepted

Accepted publishable release-bundle covers renderer-init for webgpu-dense-grass.

backend-is-webgpuaccepted

Accepted publishable release-bundle covers backend-is-webgpu for webgpu-dense-grass.

mechanism-reachableaccepted

Accepted publishable release-bundle covers mechanism-reachable for webgpu-dense-grass.

render-or-compute-workaccepted

Accepted publishable release-bundle covers render-or-compute-work for webgpu-dense-grass.

aligned-readbackaccepted

Accepted publishable release-bundle covers aligned-readback for webgpu-dense-grass.

Capture state

Field	Published value
Primary route	`/demos/webgpu-dense-grass/`
Cameras	`near, design, far`
Seeds	`0x00000001, 0x9e3779b9`
Modes	`final, bounds, density, lod, wind, no-post, diagnostics`
Capture time	`Not present in the promoted report data`
Adapter identity	`{"source":"exact retained renderer.backend.device reference after renderer.init()","backendType":"WebGPUBackend","deviceType":"GPUDevice","deviceLabel":"","deviceIdentityVerified":true,"lossPromiseObservedOnActualDevice":true,"rendererDeviceGeneration":1}`
Raw readback hashes	`Not present in the promoted preview summary`

Fixed routes

Kind	Id	Startup state	Status
scenario	`dense-grass-placement`	`{"scenario":"dense-grass-placement"}`	accepted
scenario	`dense-grass-wind-and-trampling`	`{"scenario":"dense-grass-wind-and-trampling"}`	accepted
scenario	`dense-grass-lod-and-impostors`	`{"scenario":"dense-grass-lod-and-impostors"}`	accepted
scenario	`uniform-density`	`{"scenario":"uniform-density"}`	accepted
scenario	`mask-a`	`{"scenario":"mask-a"}`	accepted
scenario	`mask-b`	`{"scenario":"mask-b"}`	accepted
scenario	`mask-c`	`{"scenario":"mask-c"}`	accepted
mechanism	`dense-grass-placement`	`{"scenario":"dense-grass-placement","mode":"density"}`	accepted
mechanism	`dense-grass-wind-and-trampling`	`{"scenario":"dense-grass-wind-and-trampling","mode":"wind"}`	accepted
mechanism	`dense-grass-lod-and-impostors`	`{"scenario":"dense-grass-lod-and-impostors","mode":"lod"}`	accepted
tier	`dense/ultra`	`{"tier":"dense/ultra"}`	accepted
tier	`dense/high`	`{"tier":"dense/high"}`	accepted
tier	`dense/medium`	`{"tier":"dense/medium"}`	accepted
tier	`dense/low`	`{"tier":"dense/low"}`	accepted

Locked tier contracts

dense/ultra · accepted

{
  "targetClass": "Correctness workload; target performance unmeasured",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "dprCap": {
      "value": 2,
      "unit": "ratio",
      "label": "Authored",
      "source": "dense tier route"
    }
  },
  "mechanismLimits": {
    "patches": {
      "value": 81,
      "unit": "patches",
      "label": "Derived",
      "source": "(2*4+1)^2"
    },
    "bladesPerPatch": {
      "value": 18000,
      "unit": "blades",
      "label": "Authored",
      "source": "denseGrassQualityTiers.ultra"
    }
  },
  "resourceLimits": {
    "bytesPerBlade": {
      "value": 64,
      "unit": "bytes",
      "label": "Derived",
      "source": "four vec4 storage records"
    }
  },
  "degradationFromPrevious": [],
  "preservedInvariants": [
    "native WebGPU",
    "spatially ranked LOD",
    "rooted wind",
    "immutable static storage between streaming events"
  ]
}

dense/high · accepted

{
  "targetClass": "Exact audited dense-high workload; target performance unmeasured",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "dprCap": {
      "value": 1.5,
      "unit": "ratio",
      "label": "Authored",
      "source": "dense tier route"
    }
  },
  "mechanismLimits": {
    "patches": {
      "value": 49,
      "unit": "patches",
      "label": "Gated",
      "source": "dense-high acceptance contract"
    },
    "bladesPerPatch": {
      "value": 12000,
      "unit": "blades",
      "label": "Gated",
      "source": "dense-high acceptance contract"
    }
  },
  "resourceLimits": {
    "allocatedBlades": {
      "value": 588000,
      "unit": "blades",
      "label": "Derived",
      "source": "49*12000"
    },
    "bytesPerBlade": {
      "value": 64,
      "unit": "bytes",
      "label": "Gated",
      "source": "dense-high acceptance contract"
    },
    "initDispatches": {
      "value": 49,
      "unit": "dispatches",
      "label": "Gated",
      "source": "one per patch"
    }
  },
  "degradationFromPrevious": [
    "reduce patch radius",
    "reduce blades per patch"
  ],
  "preservedInvariants": [
    "native WebGPU",
    "spatially ranked LOD",
    "rooted wind",
    "one representation per visible patch"
  ]
}

dense/medium · accepted

{
  "targetClass": "Balanced correctness workload; target performance unmeasured",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "dprCap": {
      "value": 1.25,
      "unit": "ratio",
      "label": "Authored",
      "source": "dense tier route"
    }
  },
  "mechanismLimits": {
    "patches": {
      "value": 25,
      "unit": "patches",
      "label": "Derived",
      "source": "(2*2+1)^2"
    },
    "bladesPerPatch": {
      "value": 8000,
      "unit": "blades",
      "label": "Authored",
      "source": "denseGrassQualityTiers.medium"
    }
  },
  "resourceLimits": {
    "bytesPerBlade": {
      "value": 64,
      "unit": "bytes",
      "label": "Derived",
      "source": "four vec4 storage records"
    }
  },
  "degradationFromPrevious": [
    "reduce patch radius",
    "reduce blades per patch",
    "earlier impostors"
  ],
  "preservedInvariants": [
    "native WebGPU",
    "spatially ranked LOD",
    "rooted wind",
    "bounded touch channel"
  ]
}

dense/low · accepted

{
  "targetClass": "Minimum native-WebGPU dense workload; target performance unmeasured",
  "frameTargetMs": null,
  "resolutionPolicy": {
    "dprCap": {
      "value": 1,
      "unit": "ratio",
      "label": "Authored",
      "source": "dense tier route"
    }
  },
  "mechanismLimits": {
    "patches": {
      "value": 9,
      "unit": "patches",
      "label": "Derived",
      "source": "(2*1+1)^2"
    },
    "bladesPerPatch": {
      "value": 3000,
      "unit": "blades",
      "label": "Authored",
      "source": "denseGrassQualityTiers.low"
    }
  },
  "resourceLimits": {
    "bytesPerBlade": {
      "value": 64,
      "unit": "bytes",
      "label": "Derived",
      "source": "four vec4 storage records"
    }
  },
  "degradationFromPrevious": [
    "reduce patch radius",
    "reduce blades per patch",
    "larger patches",
    "earlier impostors"
  ],
  "preservedInvariants": [
    "native WebGPU",
    "spatially ranked LOD",
    "rooted wind",
    "bounded touch channel"
  ]
}

Limitations

Performance and GPU attribution remain NOT_CLAIMED unless a hardware performance lane is present.
Promoted media are native-WebGPU correctness readbacks bound by the accepted release-bundle ledger.