{
    "id": "rooted-gantry-arm-f35c8f",
    "title": "Rooted gantry arm",
    "class": "vehicle",
    "triangles": 2549,
    "kit": "salvage-commons-d0be9f",
    "free": true,
    "plan": "free",
    "price_usd": 0,
    "price_note": "free: every low poly model is. The /cdn links need no account and no key (an account adds the ready-to-serve zip). The HD edition, where `hd` is not null, comes with Pro",
    "owned": true,
    "page": "https://polyfork.dev/asset/rooted-gantry-arm-f35c8f",
    "thumbnail": "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/hero.png",
    "preview_glb": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f-preview.glb",
    "hd": {
        "plan": "pro",
        "page": "https://polyfork.dev/asset/rooted-gantry-arm-f35c8f?edition=hd",
        "kind": "its own high poly program with pbr materials",
        "triangles": 9778,
        "preview_glb": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f-hd-preview.glb",
        "files": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f-hd.zip (Pro, with a key)"
    },
    "preview_triangles": 2549,
    "preview_fidelity": 1,
    "preview_rigged": true,
    "preview_rig": "pivots",
    "preview_pivots": [
        "turntable",
        "boom-lower",
        "boom-upper",
        "wrist",
        "grip-l",
        "grip-r"
    ],
    "preview_note": "This preview keeps its pivots named (preview_pivots), so they turn as rigged_parts describes; its normals are stripped for flat shading. This model is free, so build with `download.glb`: the authored file, normals and node names as built.",
    "has_rig": true,
    "remixable": true,
    "has_night": true,
    "has_decals": false,
    "has_ik": true,
    "ik_type": "arm",
    "has_skeleton": false,
    "size_m": {
        "x": 2,
        "y": 3.93,
        "z": 2.99
    },
    "origin_y": 0,
    "mass_kg": 8000,
    "download": {
        "glb": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f.glb",
        "mjs": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f.mjs",
        "auth": "none"
    },
    "export_formats": {
        "fbx": {
            "url": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f.fbx",
            "for": "Unity, Unreal, Maya, 3ds Max",
            "available": true
        },
        "usdz": {
            "url": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f.usdz",
            "for": "iOS AR Quick Look, Omniverse; with UsdPhysics collision and mass",
            "available": true
        },
        "usda": {
            "url": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f.usda",
            "for": "Isaac Sim, Omniverse, Blender, usdview; with UsdPhysics collision and mass",
            "available": true
        },
        "obj": {
            "url": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f.obj",
            "for": "universal, geometry only, no pivots",
            "available": true,
            "also_fetch": "https://polyfork.dev/dl/rooted-gantry-arm-f35c8f.mtl",
            "also_fetch_note": "save it beside the .obj as rooted-gantry-arm-f35c8f.mtl: the model names that exact file and imports white without it"
        }
    },
    "export_note": "vertex colours become NAMED MATERIALS on export, named after this asset's own colour knobs; a plain format conversion would arrive white, because only three.js reads our COLOR_0. Built on first request (about a second), cached after. This model is free: these download with no account and no key (only its .mjs source asks for a free account).",
    "night": {
        "lamp": {
            "color": "#ffb45a",
            "intensity": 0.95,
            "albedo": "#8a6236",
            "findable": true,
            "describe": "the two big porthole lamps on the shoulder cheeks \u2014 the warm amber eyes the arm is recognised by after dark"
        }
    },
    "night_note": "each zone is found by its ALBEDO in COLOR_0: match those vertices exactly, make them emissive at the zone colour and intensity, and drop your scene lights. That is the whole night look.",
    "params_url": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f-params.json",
    "real_scale": {
        "at_real_size": false,
        "real_m": [
            10,
            30
        ],
        "real_dimension": "length",
        "as_built_m": 3.93,
        "scale_to_real": 5.09,
        "note": "built SMALLER than the real thing: its largest dimension is 3.93 m as built, a real one is typically 10-30 m (an estimate). createAsset({ scale: 5.09 }) is about real size. size_m, physics and mass_kg describe the model as built; mass goes with the cube of the scale."
    },
    "physics": {
        "mass_kg": 8000,
        "mass_source": "estimated",
        "material": "metal",
        "body": "static",
        "dimensions_m": {
            "x": 2,
            "y": 3.935,
            "z": 2.994
        },
        "up_axis": "Y",
        "meters_per_unit": 1,
        "volume_m3": 5.330714,
        "collision": {
            "approximation": "convexDecomposition",
            "parts": 32,
            "colliders_url": "https://polyfork.dev/cdn/rooted-gantry-arm-f35c8f-colliders.json"
        },
        "note": "For the default knob settings; a size knob changes all of it. dimensions_m and the colliders are measured from the model; mass_kg and material are an estimate of what the real object weighs. body \"static\" means fixed in place (give it a collider, no rigid body); \"dynamic\" means it moves. collision.approximation uses UsdPhysics terms: \"convexHull\" = one hull is a good fit, \"convexDecomposition\" = use the per-part hulls in colliders_url (the one hull would fill a gap, like the space under a table). Model space, metres, Y up, origin as the model ships."
    },
    "simready_metadata": {
        "simready_metadata_mass": 8000,
        "simready_metadata_rigid_body_count": 0,
        "usd_dimensions": [
            2,
            2.994,
            3.935
        ],
        "usd_up_axis": "Z",
        "usd_meters_per_unit": 1,
        "simready_metadata_validation__profile": null
    },
    "materials": 1,
    "draw_calls": 8,
    "description": "Rooted lifting arm on a 2x2m riveted plate base with a rotating brass slew ring, a fat two-section boom of bolted lattice and rolled plate reaching about 6m with a rounded grab cradle and a counterweight drum at the back, copper hydraulic tanks.",
    "palette": [
        {
            "hex": "#e3b34a",
            "share": 0.466
        },
        {
            "hex": "#b4652e",
            "share": 0.176
        },
        {
            "hex": "#f2e6c8",
            "share": 0.061
        },
        {
            "hex": "#d2703a",
            "share": 0.055
        },
        {
            "hex": "#8a9498",
            "share": 0.052
        },
        {
            "hex": "#5ea83a",
            "share": 0.044
        }
    ],
    "style": "low-poly, flat-shaded vertex colors, no textures, single shared material, so any set of these merges to one draw call; shares palette and scale with its kit",
    "origin": "ground level (minY = 0): the model sits on y=0 as-is",
    "rigged_parts": {
        "turntable": {
            "axis": "y",
            "range": [
                0,
                115
            ]
        },
        "boom-lower": {
            "axis": "x",
            "range": [
                0,
                30
            ]
        },
        "boom-upper": {
            "axis": "x",
            "range": [
                0,
                19
            ]
        },
        "wrist": {
            "axis": "x",
            "range": [
                0,
                -49
            ]
        },
        "grip-l": {
            "axis": "z",
            "range": [
                0,
                26
            ]
        },
        "grip-r": {
            "axis": "z",
            "range": [
                0,
                -26
            ]
        }
    },
    "detachable_parts": [
        "crate"
    ],
    "animation": "rigged parts are named groups with the pivot at the hinge/axle: obj.getObjectByName(part) then rotation[axis] (rotate, degrees) or position[axis] (slide, meters). 0 is the pose the model is built in, which is not always shut: `range` is all the travel the part has from there, and outside it the part passes through the body. Whether the range opens or closes is in that knob's describe in params_url",
    "detaching": "detachable parts are named groups you may hide or remove: obj.getObjectByName(part).visible = false, or .removeFromParent(). The surface behind each is closed, so nothing shows a hole",
    "arm": {
        "slew": "turntable",
        "joints": [
            "boom-lower",
            "boom-upper"
        ],
        "upper": 1.4,
        "lower": 2.444,
        "tip": [
            -0.13,
            0.423,
            2.407
        ],
        "tip_rest": [
            -0.13,
            3.326,
            1.195
        ],
        "base": [
            0,
            0,
            0.01
        ],
        "reach": 3.844,
        "stays": [],
        "axes": {
            "slew": "y",
            "joints": "x"
        },
        "units": "metres, radians",
        "runtime": "https://polyfork.dev/cdn/walk.mjs",
        "note": "two-link chain with a slew: the same solver the legged machines use. Joint ranges in `rig` are the real limits and the tip stops at them.",
        "how": "a slew and a two-link boom: aim the tip and solve, stopping at the joint ranges in rigged_parts. three.js users import https://polyfork.dev/cdn/walk.mjs and call arm(model, { rig, detach }).reachTo(point), where rig and detach are the asset module's own exports (import { createAsset, rig, detach } from the .mjs): the arm cannot find its joints without them"
    },
    "published_at": "2026-08-05 12:48:01",
    "renders": [
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/back.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/close.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/compare.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/detail.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/front.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/hero-crop.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/hero.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/left.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/low-back.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/low.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-boom-lower.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-boom-upper.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-grip-l.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-grip-r.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-turntable.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/pose-wrist.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/proofs.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/removed-crate.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/right.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/top.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/under.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-colorway-barn-oxide.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-colorway-cream-brass.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-colorway-deep-verdigris.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-reach-0.74.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-reach-1.3.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-rootPipes-2.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-rootPipes-6.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-tool-fork.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-tool-hook.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-wear-derelict.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/variant-wear-kept.png",
        "https://polyfork.dev/files/rooted-gantry-arm-f35c8f/renders/views.png"
    ],
    "license": "Use in commercial projects, no attribution. No redistribution of the files themselves. https://polyfork.dev/licensing",
    "access": {
        "as": "anonymous",
        "remix_bakes_per_hour": 40,
        "remix_bakes_left_this_hour": 40,
        "remix_note": "The budget is on generating NEW geometry. Variations anyone has already baked are served to everybody and never counted, so re-fetching a variant you or anyone else has made costs nothing.",
        "remix_bakes_per_month": 100,
        "remix_bakes_left_this_month": 100,
        "remix_allowance_resets": "2026-12-01",
        "remix_allowance_note": "Anonymous callers are counted per IP address, so other sessions from the same address share this. A free account raises it to 300 a WEEK on its own budget, and costs an email address.",
        "a_free_account_adds": {
            "how": "Authorization: Bearer <key>, created at https://polyfork.dev/account. Costs an email address.",
            "remix_bakes_per_hour": 100,
            "remix_bakes_per_week": 300,
            "downloads": "every low poly model's .mjs program and a ready-to-serve zip from /dl, and any kit as one zip (/dl/kit-<id>.zip). The .glb, .fbx, .usdz, .usda and .obj need no key"
        },
        "pro_adds": {
            "url": "https://polyfork.dev/pricing",
            "usd_per_year": 149,
            "hd_editions": "the HD edition of a model: the same program built finer, high poly with PBR materials generated in code, every knob still working. 1,595 models have one. Free accounts get its public preview (/cdn/<id>-hd-preview.glb) only",
            "cdn": "a per-account /c/<token>/ path for the HD files you can hotlink from a shipped build; it keeps up when an asset is rebuilt, and the token is not the API key",
            "remix_bakes_per_hour": 900,
            "remix_bakes_per_week": "uncapped: a free account gets a weekly allowance, Pro does not"
        }
    }
}