{
    "id": "breakdown-crane-6a67d9",
    "title": "Breakdown Crane",
    "class": "vehicle",
    "triangles": 3628,
    "kit": "countryside-railway-9b4c57",
    "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/breakdown-crane-6a67d9",
    "thumbnail": "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/hero.png",
    "preview_glb": "https://polyfork.dev/cdn/breakdown-crane-6a67d9-preview.glb",
    "hd": {
        "plan": "pro",
        "page": "https://polyfork.dev/asset/breakdown-crane-6a67d9?edition=hd",
        "kind": "its own high poly program with pbr materials",
        "triangles": 11505,
        "preview_glb": "https://polyfork.dev/cdn/breakdown-crane-6a67d9-hd-preview.glb",
        "files": "https://polyfork.dev/dl/breakdown-crane-6a67d9-hd.zip (Pro, with a key)"
    },
    "preview_triangles": 3628,
    "preview_fidelity": 1,
    "preview_rigged": true,
    "preview_rig": "pivots",
    "preview_pivots": [
        "wheel-1",
        "wheel-2",
        "wheel-3",
        "turntable",
        "jib",
        "fall"
    ],
    "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": true,
    "has_ik": true,
    "ik_type": "arm",
    "has_skeleton": false,
    "size_m": {
        "x": 2.7,
        "y": 7.29,
        "z": 10.25
    },
    "origin_y": 0.27,
    "mass_kg": 120000,
    "download": {
        "glb": "https://polyfork.dev/cdn/breakdown-crane-6a67d9.glb",
        "mjs": "https://polyfork.dev/cdn/breakdown-crane-6a67d9.mjs",
        "auth": "none"
    },
    "export_formats": {
        "fbx": {
            "url": "https://polyfork.dev/dl/breakdown-crane-6a67d9.fbx",
            "for": "Unity, Unreal, Maya, 3ds Max",
            "available": true
        },
        "usdz": {
            "url": "https://polyfork.dev/dl/breakdown-crane-6a67d9.usdz",
            "for": "iOS AR Quick Look, Omniverse; with UsdPhysics collision and mass",
            "available": true
        },
        "usda": {
            "url": "https://polyfork.dev/dl/breakdown-crane-6a67d9.usda",
            "for": "Isaac Sim, Omniverse, Blender, usdview; with UsdPhysics collision and mass",
            "available": true
        },
        "obj": {
            "url": "https://polyfork.dev/dl/breakdown-crane-6a67d9.obj",
            "for": "universal, geometry only, no pivots",
            "available": true,
            "also_fetch": "https://polyfork.dev/dl/breakdown-crane-6a67d9.mtl",
            "also_fetch_note": "save it beside the .obj as breakdown-crane-6a67d9.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": "#e3c096",
            "intensity": 1,
            "albedo": "#d1ad73",
            "findable": true,
            "describe": "the two cab lamps on the front corners of the crane house, warm amber"
        },
        "glass": {
            "color": "#e3c096",
            "intensity": 0.8,
            "albedo": "#563e26",
            "findable": true,
            "describe": "the cab front, side and door windows lit warm amber from inside"
        }
    },
    "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.",
    "decals": [
        {
            "name": "solebar-right",
            "size": [
                0.8,
                0.16
            ],
            "at": [
                1.27,
                1.555,
                0
            ],
            "normal": [
                1,
                0,
                0
            ],
            "up": [
                0,
                1,
                0
            ],
            "describe": "the face of the raised number plate in the middle of the frame solebar, between the folded outriggers: crane number, company initials or depot name",
            "albedo": "#baab58",
            "mode": "plate",
            "relief_mm": 0
        },
        {
            "name": "solebar-left",
            "size": [
                0.8,
                0.16
            ],
            "at": [
                -1.27,
                1.555,
                0
            ],
            "normal": [
                -1,
                0,
                0
            ],
            "up": [
                0,
                1,
                0
            ],
            "describe": "the face of the raised number plate in the middle of the frame solebar, between the folded outriggers: crane number, company initials or depot name",
            "albedo": "#baab58",
            "mode": "plate",
            "relief_mm": 0
        }
    ],
    "decals_note": "flat areas you can print your own logo, sign, number or stencil on. `at` is the centre in model space (metres), `normal` points out of the surface, `up` is which way is up in the artwork, `size` is [width, height]. In three.js: bake art with https://polyfork.dev/cdn/sdf.mjs and place it with https://polyfork.dev/cdn/decal.mjs. In any other engine, a `plate` area takes a quad at `at` + `normal` * 0.002; a `projected` area is on a curved face `relief_mm` deep and the mark has to be projected onto the geometry. `albedo` is the colour of the surface underneath, so you can pick art that contrasts. Measured on the DEFAULT build: a geometry knob (a remix, a get_variant result) can move the surface by a few centimetres, and decal.mjs follows it because it raycasts the model you hand it; anywhere else, re-measure or keep the defaults.",
    "params_url": "https://polyfork.dev/cdn/breakdown-crane-6a67d9-params.json",
    "real_scale": null,
    "physics": {
        "mass_kg": 120000,
        "mass_source": "estimated",
        "material": "steel",
        "body": "dynamic",
        "dimensions_m": {
            "x": 2.7,
            "y": 7.286,
            "z": 10.252
        },
        "up_axis": "Y",
        "meters_per_unit": 1,
        "volume_m3": 39.310078,
        "collision": {
            "approximation": "convexDecomposition",
            "parts": 14,
            "colliders_url": "https://polyfork.dev/cdn/breakdown-crane-6a67d9-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": 120000,
        "simready_metadata_rigid_body_count": 1,
        "usd_dimensions": [
            2.7,
            10.252,
            7.286
        ],
        "usd_up_axis": "Z",
        "usd_meters_per_unit": 1,
        "simready_metadata_validation__profile": null
    },
    "materials": 1,
    "draw_calls": 10,
    "description": "Six-wheel steam breakdown crane vehicle about 9 m over buffers: a heavy frame with stowed outrigger beams, a superstructure with boiler house and cab on a slewing ring, a lattice jib with a hook block on its cable.",
    "palette": [
        {
            "hex": "#7c766b",
            "share": 0.267
        },
        {
            "hex": "#2d2925",
            "share": 0.178
        },
        {
            "hex": "#3e3328",
            "share": 0.126
        },
        {
            "hex": "#3f4140",
            "share": 0.121
        },
        {
            "hex": "#774034",
            "share": 0.12
        },
        {
            "hex": "#63662c",
            "share": 0.089
        }
    ],
    "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": "already at installed height (minY = 0.27 m): the model is built where it belongs, so place it at y=0 and do not lift it",
    "rigged_parts": {
        "fall": {
            "axis": "x",
            "range": [
                0,
                22
            ]
        },
        "jib": {
            "axis": "x",
            "range": [
                0,
                -22
            ]
        },
        "turntable": {
            "axis": "y",
            "range": [
                -180,
                180
            ]
        },
        "wheel-1": {
            "axis": "x",
            "range": [
                0,
                160
            ]
        },
        "wheel-2": {
            "axis": "x",
            "range": [
                0,
                160
            ]
        },
        "wheel-3": {
            "axis": "x",
            "range": [
                0,
                160
            ]
        }
    },
    "detachable_parts": [],
    "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",
    "arm": {
        "slew": "turntable",
        "joints": [
            "jib",
            "fall"
        ],
        "upper": 7.661,
        "lower": 2.351,
        "tip": [
            0,
            -2.35,
            0.07
        ],
        "tip_rest": [
            0,
            4.998,
            5.592
        ],
        "base": [
            0,
            1.8,
            -1.62
        ],
        "reach": 10.012,
        "stays": [
            {
                "chain": [
                    "stay",
                    "stay-tail"
                ],
                "to": "jib"
            }
        ],
        "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": "2026-10-25 03:28:45",
    "renders": [
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/back.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/close.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/compare.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/detail.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/front.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/hero-crop.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/hero.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/left.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/low-back.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/low.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-fall.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-jib.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-turntable.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-wheel-1.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-wheel-2.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/pose-wheel-3.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/proofs.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/right.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/top.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/under.png",
        "https://polyfork.dev/files/breakdown-crane-6a67d9/renders/views.png"
    ],
    "license": "Mesh files (GLB, FBX, USD, OBJ): CC BY 4.0 with the line in `credit`, or the Polyfork licence with no credit and no redistribution, your choice. The .mjs source and the HD edition: Polyfork licence only, commercial use, no attribution, no redistribution. https://polyfork.dev/licensing",
    "credit": "Breakdown Crane by Polyfork (https://polyfork.dev/asset/breakdown-crane-6a67d9), CC BY 4.0",
    "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. 1,824 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"
        }
    }
}